Micronote 132 - Aircraft Lightning Protection/DIRECTselect Method (3.6 MB)

MicroNote™ 132
Aircraft Lightning Protection
A Shortcut to Selecting Transient Voltage Suppressors
for RTCA/DO-160 Threats
Featuring Microsemi’s New
DIRECTselect™ Method
by
Mel Clark and Kent Walters
Micronote 132
Power Matters.™
MicroNote 132
Aircraft Lightning Protection
Table of Contents
Background
3
Abnormal Voltage Characteristics
4
Definitions for Graphs 1-18
5
Using DIRECTselect – Examples for Waveform 5A
6
Clamping Voltage Significance
7
Selecting Lightning Protection for Waveform 5A
8
Protecting Across Power Distribution Lines
9
Multiple Surge Events
11
Summary and Conclusions
11
Acknowledgments and References
12
Index of DIRECTselect Graphs
13
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DIRECTselect Graphs and Data Tables
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BACKGROUND
Within the thin metal and composite shell of every jetliner, tens of thousands of sensitive semiconductor
components are performing critical functions from navigation to engine control. Since aircraft are struck by lightning
twice a year on average, protection of sensitive electronic devices providing a myriad of functions is essential to
ensuring the safety of both passengers and crew.
Although aircraft lightning threats are well defined in RTCA/DO-160, there are very few off-the-shelf transient
voltage suppressors (TVSs) that are direct "plug-ins" rated for operating voltage and surge protection from the three
waveforms and five levels of lightning threats defined in this document.
Lengthy calculations must often be made to convert TVS surge ratings at standard 10/1000 µs to their equivalent
values for specified aircraft lightning threats. In addition, matching a device with the threat can be cumbersome.
Our MicroNotes 126, 127 and 130 illustrate these computations, providing a path from defined aircraft surge
requirements to the parameters of available TVS products suitable for a given application. With those many
resources, there is also Now a better way using Microsemi's DIRECTselect™ to quickly guide the designer to a
suitable solution including considerations for elevated temperature deratings where applicable.
DIRECTselect Method
Here is how it works: Define your surge requirements as specified in DO-160F in Section 22, Induced Transient
Susceptibility per waveform, 3, 4, or 5A and Threat Levels 1 through 5 as specified in Table 22-2. Herein are
the threat levels for Pin Injection that define the most severe threats to your circuit. Most requirements combine
Waveforms 3 and 4. Since Waveform 4 (6.4/69 µs) is more severe, by a factor of 3.8 [1], we have included only
Waveform 4 on our charts for simplicity. Values of Waveform 3 only, when required, are easily calculated using the
guidance in MicroNote 127 [2].
For reference, Waveforms 3, 4, and 5A are illustrated in Figures 1, 2 and 3 respectively
Figure 1. Waveform 3
Figure 2. Waveform 4
Figure 3. Waveform 5A
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Figure 4. Matrix of Threat Levels 1 through 5 from Table 22-2 in RTCA/DO-160.
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This table defines the peak open circuit voltage (Voc) and peak short circuit current (Isc) for each of the waveforms
listed. In making your TVS selection, maximum Working Standoff Voltage (VWM) values are required along with
the Peak Pulse Current (IP) threat, where the graphs shown on pages 14 thru 31 are plotted with IP vertically and
VWM horizontally. The IP as displayed on the graph must exceed the curve depicting the current limit of the Threat
Level. Examples will lead you through the selection process.
Individual graphs exist for each TVS product family and are arranged in ascending order of power rating and
surge current from 500 W up through 30,000 W. These graphs are also a further extension of information in
Tables 1 and 2 of MicroNote 130 [3] with added consideration for 70°C and 100°C. Graphs 1 through 9 are
associated with Waveform 4 and Graphs 10 through 18 are associated with Waveform 5A. Each graph is
accompanied by a supplemental table containing multiple data points from which each curve was derived, plus a
list of the applicable Microsemi products for use with these specific surge current threat levels. This
presentation provides direction for TVS selection for a broad distribution, from low voltage, low level lightning
threats on data lines up through high levels for power distribution lines.
ABNORMAL VOLTAGE CHARACTERISTICS
Other critical voltage parameters for selecting TVS products may sometimes include extended Surge Limits
associated with abnormal voltage. These are maximum excursions above the nominal operating voltage. Surges
differ from transient voltage in that they are long term Abnormal Voltage Characteristics with high-line voltages
extending for durations of tens, up to hundreds of milliseconds that can destroy TVSs.
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These voltage anomalies are caused by normal generator functions and must be considered in TVS selection. An
example of the ac abnormal voltage surge curve, displaying voltage vs time is shown in Figure 16-5 of the
RTCA/DO-160, Section 16 specification as illustrated below in Figure 5:
Figure 5. Envelope of AC Abnormal Voltage Surges from Figure 16-5 in RTCA/DO-160
The normal operating voltage values in this graph are for 115 V rms. The rms values must be converted to peak ac
values for comparing TVS parameters since the TVSs are characterized for peak, not rms values. A TVS will not
withstand the long surge durations of abnormal voltage surge. They must be selected so that the maximum
Peak Working Voltage, VWM, is equal to or greater than the peak abnormal voltage. Higher magnitude short
transients well beyond these voltages such as found in Waveform 3, 4 and 5A are still clamped after exceeding the
VBR of the properly selected TVS. For 230 V rms lines, double the values shown in the graph above [4].
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DC power lines are also plagued with the same anomaly, abnormal dc voltage surge, resulting from voltage
excursions produced by the generators. For dc power, there are three categories of surge voltage as shown in
RTCA/DO-160, Section 16, Figure 16-6 as also shown below in Figure 6.
Figure 6. Typical Abnormal DC Voltage Surges per Figure 16-6 in RTCA/DO-160.
Note that there are 3 categories of abnormal voltages for 28 V nominal and with 100 ms worst case surge,
similar to the ac power lines. Three levels of abnormal voltages are listed; Category A, B and Z with the most
common requirement being Category B. For 14 V dc requirements, divide these upper voltage limits by 2 for
the applicable values [5].
As with the envelope for the ac voltages, the VWM of the TVS must be equal to or greater than the abnormal
voltage limit. For exceptions, consult factory.
DEFINITIONS FOR GRAPHS 1 THROUGH 18
The green, blue and yellow curves represent the ratings of the TVS device in terms of rated Peak Pulse
Current (IP) at ambient temperatures. The IP is shown in the vertical axis and Working Voltage (VWM) in the
horizontal axis. The green curve on each graph depicts the peak surge current rating versus working voltage at
25°C along with additional curves for derating to 70°C (blue curve) and 100°C (yellow curve). The red Curves,
represent the Pin Injection current threat levels as defined by the RTCA/DO-160 specification and are labeled
accordingly. If the curve for the applicable ambient operating temperature is above the red curve designating the
maximum threat level, the TVS device will perform at that threat level. Only those levels that are applicable for the
associated device families are included on the graph.
The eighteen individual graphs in this document cover the entire DO-160 threat range. Nine of these graphs
display surge threats and surge capability of the TVSs for Waveform 4 (6.4/69 µs) and nine display this
same information for the more severe Waveform 5A (40/120 µs). Values shown on the graph include the
+20% high side tolerance of the pulse widths.
GRAPH OVERVIEW
Each graph is derived from the peak pulse current (IPP) levels at 10/1000 µs ratings of the product data sheet. For
the shorter aircraft transients, the power levels are higher, by a factor of 3.33x for the 6.4/69 µs waveform and 2.33x
for the 40/120 µs waveform and are labeled as IP. These multiplication factors include the +20% tolerance of the
threat duration [6]. For Waveform 4, the graph numbers and associated TVS power levels with part types are
listed on the following page. Except for 1Nxxxx part numbers shown that already have military qualifications,
add M prefix for source control or MA, MX, or MXL for further upgrade screening options on plastic devices
as described in MicroNote 129.
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Based on requests from the aerospace industry, Microsemi devices meet the vast majority of needs. If no part
exists for a given voltage and surge current rating, custom components can be designed. Consult the factory for
these options.
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Graph
Number
TVS Power Level
@ 10/1000 µs
Product Series
(more details on graphs)
1
500 W
2
3
600 W
1500 W
4
5
6
7
8
9
3000 W
5000 W
6500 W
7500 W
15,000 W
30,000 W
1N6103A-1N6137A, 1N6461-1N6468,
1N8073-1N8109, P5KE, SMBJSAC
P6KE, SMB
1N5629A-1N5665A, 1N5907, 1N5908,
1N6036A-1N6072A, 1N6138A-1N6173A,
1N6469-1N6476, 1N8110-1N8146,
1.5KE, SMC, SMCJLCE
SML
5KP
PLAD6.5KP
PLAD7.5KP
15KP, PLAD15KP
PLAD30KP
A more complete listing of each product series is shown on its associated graph. NOTE: A second series of
graphs (10 through 18) are also included for Waveform 5A and contains equivalent information on the product
series as waveform 4 above with threat levels increased to the magnitude of waveform 5A.
USING DIRECTselect - EXAMPLES FOR WAVEFORM 4
For our first example, let's consider a low level transient voltage threat to an ARINC - 429, +/- 5 V data line. For
this illustration, the lightning threat requires protection from Waveform 4, (6.9/69 µs) Level 3 (300Voc/60Isc).
Applications with voltages going in both positive and negative directions require bidirectional TVS devices.
We know the selection will be within the first few of the seven graphs because of the relatively low current rating
requirement. Since the lowest voltage devices have the highest current ratings, the device would most likely be
found on the first one or two graphs.
In reviewing Graph 1, the 500 W TVS at 5 V working voltage (VWM) has a peak current rating of 180 A. This is
O
well above the necessary requirement of 60A for Level 3 with margin for temperature derating up to 100 C. In
the supplementary table, data points for these graphs are provided that include the major parameters: Peak Pulse
Current (IPP), Clamping Voltage (VC), and VWM. Exact values not shown can be extrapolated from this data.
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Device selection for the ARINC - 429, Slow Data rate signals, 10-11 kHz, would be the SMBJ5.0C or SMBJ5.0CA.
For the Fast Data rate signals at 100 kHz, the selection would be the SMBJSAC5.0 with low capacitance of 30 pf
or less. Two of these devices are required in anti-parallel to achieve bidirectional protection. Refer to the
data sheet on Microsemi's web site for complete information on installing this part. The selection shown is a
surface mount device; however these parts are also available in axial-leaded configurations.
In our second example, a TVS is required for performance to Waveform 4 (6.4/69 µs), Level 3 (Voc300V/Isc60A)
for +/-48V ac. This application also requires a bidirectional device and must have a higher power rating than in the
previous example because its operating voltage is significantly greater. Since silicon TVSs provide the same
power rating within a series (PPP = IPP x VC), the current rating will be about one-tenth of the value for a 48 V
TVS compared to a 5.0 V device in the same series. However, the peak pulse power requirement is greater
for this application, so we continue our search among the graphs for a higher power device. In Graph 3, for the
1500 W series, we find that the current withstand (IP) of a 48 V device @ 25°C is 64 A while the requirement is
45 A at 48 V. It is interesting to note that the specified requirement of 60 A per Table 22-2 is reduced
significantly by the clamping voltage subtracting from the driving voltage [7], thus proportionally reducing the surge
current. This is reflected in the downward slope of the Level 3 Curve. The SMCJ48CA, (CA suffix denoting
bidirectional performance for ac) or equivalent will meet the surge requirements at 25°C and 70°C but is marginal at
100°C. The next level up, the 3000 W series is recommended for 100°C performance if required (see Graph 4).
Why are the “driving” current threats (IS) of Levels 1 through 5 reduced with increasing voltage? Because the
clamping voltage of the TVS subtracts from the open circuit driving voltage, thus lowering the driving current as
illustrated in the following equation:
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Where:
Is = (Voc - Vc) / Zs
(Eq. 1.)
= (300 V - 77.4 V) / 5 ohm
= 44.5 A
Is = peak driving current of surge through the TVS Voc = open circuit voltage - 300 V
Vc = Max clamping voltage of SMCJ48CA
Zs = Source impedance of driving voltage - Voc / Isc
In this equation, we see the Voc open circuit voltage of 300 V is reduced to 222.6 V, with a corresponding reduction
of surge current to 44.5 A, or about 25% below the value of 60 A for the Isc specified for Level 3.
CLAMPING VOLTAGE SIGNIFICANCE
The purpose of the TVS is to clamp the voltage spike to a level below the failure threshold of the components it is
protecting. The failure threshold voltage is not the operating voltage of the protected device. All
components have a margin between rated value and transient failure threshold which is usually not
specified by the manufacturer.
Maximum operating voltage levels specified on data sheets for ICs and power transistors are for steady state
conditions while most components can tolerate short term voltage spikes of less than 150 µs up to 50% greater
values than the operating voltages. Normally the higher the voltage of the protected device, the more narrow the
margin in percentage between maximum operating voltage level and voltage spike failure level. For example,
a 400V rated switching transistor can usually tolerate a clamping level of 420 V or more, which is about 5% greater
than its steady state operating level. In comparison, a 5 V to 15 V UART (universal asynchronous receiver
transmitter) can normally withstand a 50% or greater voltage clamp above its maximum operating level.
Manufacturers are reluctant to provide any other than the maximum operating voltage. The above failure threshold
values are based on the writer's experience, including test measurements.
Our third example of protection is for a 48 V signal line monitoring status of voltage across a relay. The threat is
Waveform 4, Level 4 (750Voc/150Isc). This takes us to a higher power level device requirement that we find is the
5000 W rated TVS shown in Graph 5. The peak current protection is more than twice that for our previous
example, so we look for a TVS with higher power that will withstand this higher peak current surge.
Observing the VWM of 48 V at Level 4 in graph 5 for 5000 W devices, we see that the maximum peak current rating
for this voltage is approximately 210A @ 25°C. The derating graphs indicate that this part will operate safely at
70°C but marginal at 100°C. For 100°C performance, the higher power PLAD6.5KP48A surface mount TVS in
Graph 6 or the PLAD7.5KP48A in graph 7 is recommended. A unipolar device was selected because this is a dc
application. Clamping of the negative transients is through the diode in the forward direction that can withstand
higher surge currents than in the avalanche mode.
A fourth example of protection continues when ascending to a higher threat level protecting from a transient
surge per Waveform 4, Level 5 (1600Voc/320Isc). Operating conditions are on a 28 V dc power distribution line
that must withstand an abnormal voltage condition of 60 V maximum, Category B [4].
The 15,000 W axial-leaded devices are often made using 3-stacked chips that have been considered the most
economical method for higher power surge suppressors. The PLAD15KP series is made up of a single larger chip
in a surface mount package for the same power rating as well as two stacked chips for twice the P PP rating at
30,000 W with the PLAD30KP series. With fewer internal chips stacked in series, it also allows lower voltages in
these PLAD product series families where they start at 7 V and 14 V respectively. This can also be very useful for
generating higher peak pulse power options as we shall observe in further examples for the severe Waveform 5A.
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Continue working your way further into the pages noting that in Graph 8 the 15,000 W TVS series will withstand
surge currents of greater than 320 A at a voltage level of 60 V and 100°C. Above 60 V, a TVS will not conduct
during the abnormal condition but will withstand a surge > 320 A for this Waveform 4, Level 5 threat. A
good selection for this application in Graph 8 would be a 15KP64A or PLAD15KP64A. Verify that the clamping
voltage is compatible with the maximum failure threshold voltage of the protected circuit / component. This
device is rated for approximately 500 A at 25°C. It has a clamping voltage of 104 V at its rated peak pulse current
(Ipp) as extrapolated from the graph/data table. This device has a significant margin of about 60% at 25°C that can
be derated to 100°C with a margin of safety.
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Our fifth example is one in which a 125 V dc status monitoring signal line must be protected from conditions of
Waveform 4, Level 5 (1600Voc/300Isc) in a 70°C ambient.
Continue on to Graph 9 and locate the coordinates for the required performance. At 130V, the PLAD30KP130A
device has a 6.4/69 µs rating of 470 A at 25°C and 380 A at 70°C; and 330A for 100°C. This selection should
perform well for the application.
SELECTING LIGHTNING PROTECTION FOR WAVEFORM 5A
Waveform 5A is defined as having a waveform, of 40/120 µs +/- 20%. Calculations in the following examples are
based on the +20% worst case, increasing the pulse duration from 120 µs to 144 µs maximum. Graphs 10
through 18 depict curves for Waveform 5A. These protection levels are developed in the same manner as those
for Waveform 4 but with lower IPP device ratings attributed to the longer Waveform 5A. The increase in surge
current / power for Waveform 5A is only 2.33 times the peak current value for a given device @10/1000 µs found
in Microsemi data sheets as stated earlier.
Referring to Figure 4 on page 3 and the column for Waveform 5A, note that the voltage spike amplitudes are
identical to those for Waveform 4. However, the Isc current is higher by a factor of 5 because of the lower source
impedance of only 1 ohm compared to 5 ohms for Waveform 4. Another component of the increased threat for
Waveform 5A is its 74% longer duration compared to Waveform 4.
The more severe conditions of Waveform 5A are attributed to applications involving closer proximity of lightning
source including those conductors close to the skin of the aircraft, areas containing a higher density of composite
materials, long power distribution lines, and long signal line runs within the airframe plus a myriad of others.
From the writer's experience, ac and dc power distribution systems may be located in areas requiring protection
from Waveform 5A surges, depending on the airframe structure. With the large amounts of composite materials
used in construction of newer aircraft, both power and data lines are subjected to more severe lightning threats.
Most threats presented by Waveform 5A appear to be Level 4 (750Voc/750Isc) based on the writers experience.
Typical Waveform 5A Level 4 threats require the higher 30 kW product ratings for protection. Multiple 30 kW
devices are often wired in series or parallel to provide the surge current withstand capability for Level 4, Waveform
5A threats. Although there have been no requests, TVS devices for Level 5 threats can be designed to also meet
these requirements.
Example 1 protecting from Waveform 5A threats is that of a 125 V dc status signal line subjected to Level
2 (125Voc/125Isc). This is an easy one to solve since the operating voltage and threat are at the same level. There
will be zero voltage impressed on the line because it is of the same value as the threat, hence no current is driven
into the 125 V signal line and no protection is required (see EQ.1). For this same threat at lower operating voltages,
protection will be required as shown in the following example.
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Example 2 protection from Waveform 5A is one where a low speed 32 V bidirectional signal line is exposed to a
Level 2 (125Voc/125Isc) threat. ARINC-429 and most other signals are run through shielded wiring that provides
significant lightning protection, also the line impedances are quite high, further reducing lightning threats. This
issue was discussed earlier in the section on protecting from Waveform 4 threats.
For this requirement, the solution is found on Graph 13 for the 3000 W device. The closest fit is the SMLJ33CA
(33V VWM) that can be derated for 100°C performance. This is a compact surface mount device in the DO-214AB
with J bend tabs. The SMLJ series is a frequent choice for signal line protection from harsh lightning conditions.
Example 3 for a Waveform 5A threat from Level 3 (300Voc/300Isc) lightning exposure, is for a 12 V power
supply. The 3000 W device in Graph 13 will protect up to 70°C as observed on the coordinates; however, for
protection at 100°C ambient levels, the 5000 W device depicted in Graph 14 is required where the 5KP12A axial
leaded device is recommended. For surface mount, the PLAD6.5KP12A is recommended in Graph 15.
Example 4 is more challenging protecting a 48 V off-line switching power supply with a 100 V rated transistor and
Waveform 5A, threat Level 4 (750Voc/750Isc). Ambient operating temperature is 100°C and the power is
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Category B with a maximum abnormal voltage surge of 60 V for 100 ms previously described in Figure 6. Since a
TVS will not withstand the power delivered by a 100 ms surge, 60 V becomes our defacto operating voltage. From
Graph 18 for the 30,000 W TVS, our highest powered device for this voltage (PLAD30KP60A) will withstand a
peak current of 727 A at 40/120 µs, (with VC of 96.8 V) only 74 A above the threat level of 653 A at 25°C (see Eq.1).
This is a close margin, but more than adequate to meet this requirement. A further level of creativity is required to
meet higher temperature requirements.
One option to increase surge current capability is to use two devices of the same voltage type matched in parallel,
providing twice the current capability of a single device to meet the often required 100°C ambient. They
must be matched under surge conditions to ensure near equal voltage for sharing the current evenly. Two each of
a 30KPA60A matched in parallel will provide the necessary protection up to 100°C with an approximate 50% safety
margin. Special selected matched devices can be avoided by using two of the PLAD30KP30A in series for surface
mount applications. The clamping voltage for the two devices in series is conservatively estimated to be 100 V
maximum, the same value as the maximum rated operating voltage of the protected device [8]. Using two or more
of the same lower voltage TVS devices in series (if available) where the voltage adds up to the desired V WM value is
recommended when surge currents are beyond the capability of a single TVS of a higher selected VWM value.
Multiple devices can be used as long as they are of the same type or of higher current rating when an equally
divisible required number is not available.
PROTECTING ACROSS POWER DISTRIBUTION LINES
For protection across high voltage ac power distribution lines, there is the option of stacking lower voltage, higher
current rated devices in series to compensate for the inherently lower surge current ratings of high voltage TVSs.
This is particularly applicable for high VWM applications requiring high surge current protection across ac distribution
from a Waveform 5A Level 4 threat (750Voc/750Isc).
Example 5 is for an application across a 115V ac distribution line having an Abnormal Voltage of 255 V peak
from 180 V rms (see Figure 5) feeding a switching power supply. A maximum clamping of 420 V is required for
protection of the 400 V rated transistor within the supply. A few well chosen parts can be stacked in series which
have a clamping voltage of 420 V maximum and still meet the surge current and a working voltage level equal to or
slightly above the 255 V, 100 ms abnormal high voltage condition.
When reviewing the selection of available PLAD30KPxxx series devices and comparing the listed IPP, remember
that the current rating in the data sheet is for a 10/1000 µs waveform and Waveform 5A is 40/120 µs. Per the
section on Graph Overview herein (page 5), the 10/1000 µs surge current rating is multiplied by 2.33x to obtain its
higher value for the shorter 40/120 µs pulse width.
For example, we first calculate the true surge current (Is) of the Level 4 threat to the power supply using 400 V
switching transistors with 420 V transient capability.
(Eq. 2)
IS = (Voc - Vc) / Zs
= (750V - 420V) / 1 ohm
= 330 A
From this simple calculation, we find the threat @ 25°C is 330 A at 40/120 µs. Next we review the TVS devices
available from the 30 kW ratings at 10/1000 µs such as the PLAD30KPxxx data sheet to select TVSs that provide
the desired electrical parameters with surge capability of 330 A plus derating for high temperature performance.
IP at 40/120 µs = 2.33 x IPP at 10/1000 µs
= 2.33 x 142 A
= 331 Amps max IPP
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Our target working voltage is 255 V peak, the worse case abnormal high voltage condition, or slightly higher, but
still meeting conditions of maximum surge current and clamp voltage. For a trial fit on this severe requirement, we
divide the working voltage by two, with a resulting value of 127.5 V which is closely rounded up to 130 V providing a
PLAD30KP130CA option. Total clamping voltage of these parts in series is 2 x Vc, (Vc is 209 V) resulting in 418 V.
The peak pulse current of the PLAD30KP130CA for the 40/120 µs Waveform 5A is:
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Just a reminder that IP is used to denote peak current rating at a waveform other than 10/1000 µs while IPP is the
10/1000 µs data sheet rated peak pulse current. This limit of 331 A for the TVS is approximately equal to that
calculated for this surge event of 330 A in Eq. 2, and is only suitable for 25ºC ambient temperatures, with no
margin for derating to higher temperatures. When using multiple TVS devices in series resulting in higher V C
values, the calculations in Eq. 2 indicate the red threat level curves decline in value or effectively shift to the left with
respect to the individual VWM voltages for each TVS device used in series. This also results in improved margin of
the green, blue and yellow performance curves relative to the IS calculations for threat level curves where the 18
graphs only show IS relations for individual TVS devices.
Three devices in series will provide a greater surge protection level. Dividing 255 V by three provides a
PLAD30KP85CA for a surface mount package option with a clamp voltage of 137 V each. Total clamp voltage for
the three parts in series is the additive values or 137 V x 3 yielding 411 Volts on the PLAD example where V C is still
conservative for the 420 V minimum requirement.
The peak surge current (IP) rating for these three devices rated for a 4/120 µs, Waveform 5A is derived in the same
manner as in the previous example yielding 508 A for IP that provides a 54% increased margin from 330 A in Eq 2
and can also be conservatively derated to 100°C. In this example, the stacked devices were all the same voltage
without fractional values remaining. If this is not the case, use a lower voltage device which matches closest when
added together but is still above the system operating voltage.
Example 6 is for protection across 230 V ac lines requires performance at an abnormal voltage surges up to 360 V
rms or 509 V peak for 100 ms that is twice the value in figure 5, shown on page 4. TVS protection voltage levels
are double the values previously illustrated for 115V. The same techniques are used for selecting lightning
protection devices. In some applications where narrow margins exist between operating voltage and clamping
voltage, the designer is encouraged to consult the factory for assistance.
Example 7: For protection across 28 V, Category B dc bus lines, threat Level 4 of Waveform 5A, the net surge
current is higher resulting from the lower clamp voltage as shown with a PLAD30KP60A selected for protection.
This 66.7 V minimum breakdown device will adequately meet the 60 V for 100 ms, “Abnormal Voltage” condition.
IS = (Voc - Vc) / Zs
= (750V - 96.8V) / 1 ohm
= 653 A
(Eq. 4)
The Level 4 surge current threat for a 28 V dc line is almost double that for the 115 V ac requirement previously
shown since the clamping voltage of 96.8 V is far less across the ac power line in equation 4 above. The IP of the
PLAD30KP60A for a 40/120 µs pulse is 312 x 2.33 = 727 Amps providing a margin of 11% above the IP
requirement of 653 A for a 25°C ambient.
Micronote 132
Many applications require the lowest clamping voltage that can be attained. Since the abnormal surge voltage does
not exceed 60 V, using a device with a breakdown voltage equal to this value has been acceptable for most
applications. Lower voltage TVSs providing lower clamping voltage than the PLAD30KP60A described above
include the PLAD30KP58A and PLAD30KP54A. Minimum breakdown voltages at 25°C are 64.4 V and 60.0 V
respectively on the PLAD products with minimum clamping voltages of 93.6 V and 87.1 V respectively. Maximum I P
for the PLAD30KP54A is 797 A at 40/120 µs or 2.33 x 342. Let's also compare this to the Waveform 5 Level 4
threat limit calculation.
IS =(Voc - Vc) / Zs
= (750V - 87.1V) / 1 ohm
= 662.9 A
(Eq. 5)
Compared to the PLAD30KP60A, the PLAD30KP54A offers 9.9 Amps of additional current protection and a lower
clamping voltage by 9.7 V for protecting more sensitive components. Although the lower end of the breakdown
voltage (VBR), is identical to the maximum Abnormal Voltage (60.0 V), the TVS will draw current when the
temperature drops below 25°C for example, since TVS devices have a positive temperature coefficient of voltage.
However the current drawn by the TVS will be minimal and only sufficient to maintain a breakdown voltage equal to
the maximum Abnormal Voltage during this brief time period of 100 ms. For a power line, this small amount of extra
current drawn for heating the TVS should present no problem.
10
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MicroNote 132
Aircraft Lightning Protection
MicroNote 132
Aircraft Lightning Protection
When comparing this analysis of a 54 Volt VWM in Graph 18 for Level 4 protection, it is apparent this is sufficient for
25°C but not for 70°C or above. For higher ambient temperatures as in earlier examples, the easiest practice is to
place two devices in series of one-half the voltage of the PLAD30KP54A. This is available in the surface mount
series with the PLAD30KP28A to almost double the surge current or three devices with the PLAD30KP18A to triple
the surge current capabilities. In those TVS series where these lower voltage selections have not been previously
available (such as in the older 30KPxxx axial-leaded series), the alternative for increasing surge current capability is
with matched parallel devices. Voltage matching is performed under surge conditions to ensure a very close match,
typically within the range of +/- 0.5%, for even load sharing between devices. This is normally performed by the
manufacturer. Parallel matched TVSs for aircraft lightning protection and general heavy duty surge protection have
been in use for several decades and have a record of proven performance. This method has also been thoroughly
tested in battle performance in military ships and aircraft.
For higher current applications using single components beyond the limitations of Microsemi's 30,000 watt devices,
there is the RT130KP275CV thru 295CV or CA series, which is rated at 40,000 W for 10/1000 µs. They are
characterized for Waveform 4, 6.4/69 µs and available in voltages intended for protection across 115 ac lines
including abnormal high voltage conditions. Using the conversion equations reviewed in MicroNote No. 127, they
may be applicable for other protection requirements confronted by the designer.
Copies of the RT130KP275CV thru 295CV or CA series data sheets can be downloaded from our web site at
www.microsemi.com .
MULTIPLE SURGE EVENTS
Further inquiries have been made for devices to withstand multiple surge events as also defined by RTCA/DO-160.
The profile of the surge consists of a maximum value followed by multiple strokes. Since there is cumulative
heating effects from these multiple surges, the lower thermal resistance junction to case (bottom) of the PLAD
designs make them a better choice. Also reference MicroNote 133 on our web site [9].
SUMMARY / CONCLUSIONS
This document is the fifth in our series of MicroNotes providing selection guidance specifically for the avionics
design engineer (the others include MicroNotes Nos. 126. 127, 130, and 133). It translates the data sheet peak
pulse current ratings of the 10/1000 µs waveform into the surge rating equivalents to meet the Waveform 3, 4 and
Waveform 5A threats described in RTCA/DO-160.
A matrix of graphs for each device family from 500 W peak pulse power up through 30,000 W has been derived for
surge ratings of each device family at 25°C, 70°C, and 100°C for the above threats. Each graph is supported with
a table listing the data sheet electrical parameters for the individual components listed along with calculated data
points for the curves.
Using the examples and guidelines in the text, the designer is able to select directly from the graph of a device to fit
his requirement with minimal calculating and guesswork. We expect those using this document to save valuable
design time by more rapidly selecting a TVS correctly rated for a given application.
11
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www.Microsemi.com
Rev 1; 9/10/2013 Rev 1: 11/2013
11
MicroNote
Microsemi
Corporation
MicroNoteisis aa trademark
trademark of of
Microsemi
Corporation
Micronote 132
This is our second issue at presenting this information in graph selection format. We expect other revisions to keep
up with the emerging technologies and updates of the RTCA/DO-160 specification and its latest revision. We also
still recognize there is room for modifications to make this document more user friendly. To help achieve this goal,
constructive comments from the user are welcome. It is Microsemi's desire to provide the design engineer with the
most up to date design information to assist in achieving his/her goal more efficiently.
MicroNote 132
Aircraft Lightning Protection
MicroNote 132
Aircraft Lightning Protection
ACKNOWLEDGEMENTS
For additional technical information, please contact Design Support at:
http://www.microsemi.com/designsupport
or
Kent Walters ([email protected]) at 602-458-3212
REFERENCES
Clark, O. M., MicroNote™ No. 127, Microsemi Corp., pg. 6
Clark, O. M., MicroNote No. 127, Microsemi Corp., pg. 6
Walters, K., MicroNote No. 130, Microsemi Corp.,
RTCA/DO-160E, Section 16, Figure 16-5, pgs. 16-37
RTCA/DO-160E, Section 16, Figure 16-6, pgs. 16-38
Clark, O. M., MicroNote No. 127, Microsemi Corp., pg. 10
Clark, O. M., MicroNote No. 127, Microsemi Corp., pg. 17
Clark, O. M. and Walters, K. MicroNote No. 112, Microsemi Corp.
Walters, K., MicroNote No. 133, Microsemi Corp.
Micronote 132
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
12
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MicroNote is a trademark of Microsemi Corporation
12
Copyright © 2013 Microsemi Corp.
MicroNote 132
MicroNoteProtection
132
Aircraft Lightning
Aircraft Lightning Protection
Index to
DIRECTselect Graphs and Datapoints
Waveform Rating
Power*
Pg #
Graph 1
Waveform 4
500 W
14
Graph 2
Waveform 4
600 W
15
Graph 3
Waveform 4
1500 W
16
Graph 4
Waveform 4
3000 W
17
Graph 5
Waveform 4
5000 W
18
Graph 6
Waveform 4
6500 W
19
Graph 7
Waveform 4
7500 W
20
Graph 8
Waveform 4
15,000W
21
Graph 9
Waveform 4
30,000W
22
Graph 10
Waveform 5A
500W
23
Graph 11
Waveform 5A
600W
24
Graph 12
Waveform 5A
1500W
25
Graph 13
Waveform 5A
3000W
26
Graph 14
Waveform 5A
5000W
27
Graph 15
Waveform 5A
6500W
28
Graph 16
Waveform 5A
7500W
29
Graph 17
Waveform 5A
15,000W
30
Graph 18
Waveform 5A
30,000W
31
Index
Graph #
* Power rating at 10/1000 µs
13
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13
MicroNote is a trademark of Microsemi Corporation
MicroNote 132
Aircraft Lightning Protection
Graph 1: RTCA/DO-160, Waveform 4, Levels 1 through 4, 500 W TVS Series
Waveform
RTCA/DO-160
using
500
W
TVS
Diodes
Waveform
4 4RTCA/DO-160E
using
500
W
TVS
Diodes
Waveform
4 RTCA/DO-160
using
500
W
TVS
Diodes
V
5
6
7
V
5
6
7
8
V
V
9.2
9.2
10.3
10.312.0
12.0
13.6
o
o
o
IPP 500 W
IPP 500
W
10/1000 µs
10/1000 µs
A
A
IP 25
oC C
IP 25
6.4/69 µs
6.4/69 µs
A
A
oC C
P 70
IP I70
6.4/69 µs
6.4/69 µs
A
A
100o C
IPIP100
C
6.4/69 µs
6.4/69 µs
A
A
11
50V/10A
50V/10A
A
A
A
A
54.3
54.3
48.5
48.541.7
179
179
160
160
138
146
146
131
131
113
125
125
112
112
96.6
8.2
8.2
7.9
7.9
7.6
23.1
23.1
22.9
22.9
22.6
58.2
58.2
57.9
57.9
57.6
7.2
22.8
22.8
21.9
21.9
21.6
57.2
57.2
56.9
56.9
56.6
21.0
21.0
20.1
19.2
20.1
56.0
56.0
55.1
54.2
55.1
19.2
54.2
41.7
36.7
138
121
113
99
96.6
7.6
84.7
8 9
9 10
10
13.615.4
15.417.0
17.0
36.732.5
32.529.4
29.4
121
107
10797
97
9988
88
79.5
79.5
84.7
74.9
74.9
67.9
67.9
7.2
7.0
7.0
6.6
6.6
12 15
15 18
18
19.924.4
24.429.2
29.2
25.120.6
20.617.2
17.2
8368
6857
57
68.0
55.8
46.7
55.8
46.7
58.1
47.6
39.9
47.6
39.9
6.0
5.1
4.0
5.1
4.0
20 28
28 30
30 36
32.445.4
45.448.4
48.458.1
15.411.0
11.010.3
10.38.6
5136
3634
3429
29.5
41.8
27.9
29.5
27.9
23.7
25.2
35.7
23.8
25.2
23.8
20.3
0.9
3.5
0.9
36 40
48
58.164.5
77.4
8.6 7.8
6.5
2926
22
21.3
23.7
18.0
18.2
20.3
15.4
12
20
Graph 1
VC VC
**
Peak Surge
Surge Currents
Currentsfor
forthe
theRed
RedCurves
Curves
IISS Threat
Threatfor
forLevels
Levelsshown
shownonongraph
graph
Threat
ThreatLevels
Levels1-4
1-4
40
48 50
60
19.9
32.4
64.5
77.4 80
96.8
25.1
15.4
7.8
6.5 6.0
5.2
83
51
26
2220
17.3
68.0
41.8
21.3
18.0
16.4
14.2
58.1
6.0
35.7
3.5
18.2
15.4
14.0
80
113
96.8
113 126
6.0
4.4
5.2
4.4 4.0
20
14.5
17.3
13.3
14.5
16.4
11.9
14.2
10.9
11.9
14.0
10.2
12.1
9.3
10.2
90
146
3.4
11.3
9.3
7.9
22.6
21.6
57.6
56.6
18.5
15.9
18.5
15.3
15.9
53.5
50.9
53.5
50.3
50.9
15.3
13.4
12.1
13.4
9.5
12.1
9.5
12.1
50
70
60
70 80
2
3
4
2
3
4
125V/25A 300V/60A 750V/150A
125V/25A 300V/60A 750V/150A
A
A
A
o
Over Over
limitlimit
25 oC25 C
VWM VWM
Conversiontoto6.4/69
6.4/69µsµsI IPValues
Values
Conversion
P
A
148.2
148.2
147.9
147.9
Over limit 25 oC
W TVS
@10/1000
500 500
W TVS
@10/1000
µs µs
Over limit 25 oC
Data
Points
for
Curves
Data
Points
for
Curves
inGraph
Graph
Data
Points
for
Curves
in in
Graph
1 11
Microsemi
TVsTVs
PartPart
Numbers
Microsemi
Numbers
compliant
to RTCA/DO-160E
compliant
to RTCA/DO-160
Standard
Capacitance
Standard
Capacitance
• Axial Lead
• Axial Lead
P5KE5.0A-170A, CA
P5KE5.0A-170A, CA
1N6103A-6137A
1N6103A-6137A
1N6461-6468
1N6461-6468
• Surface Mount
SMAJ5.0A-170A, CA
Low Capacitance
Low capacitance
• Axial Lead
• Axial SAC5.0-50
Lead
SAC5.0-50
• Surface Mount
SMBJSAC5.0-50
• Surface
Mount
HSMBJSAC5.0-50
50.3
Except for 1Nxxxx part numbers shown
that already have military qualifications,
add M prefix for source control or
MA, MX, or MXL for further upgrade
screening options on plastic devices as
described in Micronote 129.
80 100
126 162
4.0 3.1
13.3
10.9
9.3
10.2
8.4
7.1
90
146
3.4
11.3
9.3
7.9
* Surge currents
voltage (see Eq.
100
162 are reduced
3.1 by clamping10.2
8.41). In the table
7.1 above, the first three columns, VWM, VC, and0 IPP 500 W 0are taken from the data sheet while the subsequent
three columns of 6.4/69 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since
14
* Surge
currents
are reduced
clamping
voltagetemperatures.
(see Eq. 1). In the table above, the first three columns, VWM, VC, and IPP 500 W are taken from the data sheet while the subsequent
many
TVS devices
requireby
derating
for higher
0
0
three columns of 6.4/69 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since
© 2006 Microsemi Corporation
many TVS devices require derating for higher temperatures.
www.Microsemi.com Rev 1: 11/2013
14
Copyright © 2013 Microsemi Corp.
MicroNote 132
Aircraft Lightning Protection
Graph 2: RTCA/DO-160, Waveform 4, Levels 1 through 4, 600 W TVS Series
WaveformWaveform
4 RTCA/DO-160E
using 600600
WW
TVS
Diodes
4 RTCA/DO-160
TVS
Diodes
Waveform 4 RTCA/DO-160E
usingusing
600 W TVS
Diodes
DataPoints
Pointsfor
for
Curves
Graph
Data
Curves
in in
Graph
2 2 2
Data Points
for Curves
in Graph
V
V
5
6
7
5
6
7
8
9
10
12
15
18
36
40
48
50
60
70
12
15
18
20
28
30
36
40
48
50
60
70
VC
V
V
IPP W
600 W
IPP 600
10/1000
10/1000
µs µs
A A
oC oC
IP 70
IP 25IPo25
C oC IP 70
6.4/69
6.4/69
6.4/69
µs µs 6.4/69
µs µs
A A
A A
oCoC
IP 100
IP 100
6.4/69
6.4/69
µsµs
AA
11
50V/10A
50V/10A
AA
22
125V/25A
125V/25A
AA
3
300V/60A
300V/60A
A
A
44
750V/150A
750V/150A
AA
8.2
8.2
7.9
7.9
7.6
23.1
23.1
22.9
22.9
22.6
58.2
58.2
57.9
57.9
57.6
148.2
148.2
147.9
147.9
147.6
147.2
9.2 9.2
10.3 10.3
12.0
12.0
65.265.2
58.358.3
50.0
50.0
217217
194194
166
166
178178
159159
136
136
152
152
136
136
116
116
7.6
22.6
57.6
13.6
13.6
15.4
15.4
17.0
17.0
19.9
19.9 24.4
24.4 29.2
29.2
32.4
32.4 45.4
45.4 48.4
48.4
58.1
58.1 64.5
64.5 77.4
77.4
80.0
80.0 96.8
96.8 113
44.1
44.1
39.0
39.0
35.3
35.3
30.2
30.224.0
24.020.5
20.5
18.5
18.513.2
13.212.4
12.4
10.3
10.3 9.3
9.3 7.7
7.7
7.1
7.1 5.6
5.6 5.3
147
147
130
130
118
118
101
10180.0
80.068.2
68.2
61.3
61.343.9
43.941.3
41.3
34.3
34.331.0
31.025.6
25.6
23.6
23.620.6
20.617.6
120
120
107
107
96.7
96.7
82.8
82.8
65.6
65.6
55.9
55.9
50.2
50.2
35.9
35.9
33.9
33.9
28.1
25.4
28.1
25.20.9
4
20.9
19.3
19.16.9
3
16.14.4
9
103
103
91.0
91.0
82.6
82.6
77.7
77.7
56.0
56.0
47.7
47.7
42.9
42.9
30.7
30.7
28.9
28.9
24.0
21.7
24.0
2117.9
.7
17.9
16.5
1614.4
.5
1412.3
.4
7.2
7.2
7.0
7.0
6.6
6.6
6.0
6.0
5.2
5.2
4.0
4.0
3.5
3.5
0.9
0.9
0.3
0.3
0
0
22.2
22.2
21.9
21.9
21.6
21.6
21.0
21.0
20.1
20.1
19.2
19.2
18.5
18.5
15.9
15.9
15.3
15.3
13.4
12.1
13.4
9.5
12
.1
9.5
9.0
95.6
.0
52.4
.6
57.2
57.2
56.9
56.9
56.6
56.6
56.0
56.0
55.1
55.1
54.2
54.2
53.5
53.5
50.9
50.9
147.6
147.2
Microsemi
TVS
Part
Numbers
Microsemi
TVs
Part
Numbers
compliant
RTCA/DO-160
compliant
to to
RTCA/DO-160E
Standard
StandardCapacitance
Capacitance
• •Axial
AxialLead
Lead
P6KE6.8A-200A,
CACA
P6KE6.8A-200A,
• •Surface
Mount
Surface
Mount
SMBJ(G)5.0A-170A,
CA
SMBJ5.0A-170A, CA
Add M prefix for the part numbers
shown to add source control or
MA, MX, or MXL for further
upgrade screening options on
plastic devices as described in
Micronote 129.
Graph 2
20
28
30
8
9
10
VC
Peak
Red Curves
Curves**
PeakSurge
SurgeCurrents
Currents for the Red
ISISThreat
on graph
graph
Threatfor
forLevels
Levels shown on
Threat Levels
Levels 1-4
Threat
o
OverOver
limit
25 25
C oC
limit
VWM VWM
Conversion
to 6.4/69
µsµs
IPIP
Values
Conversion
to 6.4/69
Values
Over
limit2525oCoC
Over
limit
600 W
TVS
@10/1000
µs µs
600
W TVS
@10/1000
5.3 4.7
17.615.6
14.12.8
4
1210.9
.3
2.4
80 113 126
90
146
4.1
13.6
11.2
9.52
80
126
4.7
15.6
12.8
10.9
100
162
3.7
12.3
10.1
8.61
90
146
4.1
13.6
11.2
9.52
100* Surge currents
162
3.7
12.3
10.1
8.61
are reduced by clamping voltage (see Eq.1). In the table above, the first three columns, VWM, VC, and IPP 600 W are taken from the data sheet while the subsequent
0
0
three columns of 6.4/69 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since
* Surge currents are reduced by clamping voltage (see Eq.1). In the table above, the first three columns, VWM, VC, and IPP 600 W are taken from the data sheet while the subsequent
0
0
many TVS devices require derating for higher temperatures.
three columns of 6.4/69 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since
© 2006 Microsemi Corporation
many TVS devices require derating for higher temperatures.
www.Microsemi.com Rev 1: 11/2013
15
MicroNote is a trademark of Microsemi Corporation
15
MicroNote 132
Aircraft Lightning Protection
Graph 3: RTCA/DO-160, Waveform 4, Levels 2 through 5, 1500 W TVS Series
Points
for
Curves
in Graph
Data
Points
forCurves
Curves
Graph
DataData
Points
for
in in
Graph
3 3 3
V
5
6
7
8
9
10
Graph 3
12
15
18
20
28
30
VWM
V
VC
V
5
6 9.2
7 10.3
12.0
8
9 13.6
10 15.4
17.0
12
15 19.9
18 24.4
29.2
20
28 32.4
30 45.4
VC
IPP 1500 W
IPP 1500
W
10/1000 µs
10/1000 µs
V
A
A
9.2
163
163 146
10.3
146
12.0
125
125
13.6
110
110 97.4
15.4
17.0 97.4 88.2
88.2
19.9
75.3
24.4 75.3 61.5
29.2 61.5 51.4
51.4
32.4
46.3
45.4 46.3 33.0
48.4 33.0 31.0
Peak
SurgeCurrents
Currentsfor
forthe
theRed
RedCurves
Curves**
Peak
Surge
IS Threat
Levelsshown
shownon
ongraph
graph
IS Threat
forforLevels
ThreatLevels
Levels2-5
2-5
Threat
o
I 25 oC
I 70 oC
IP 100
oC C
IP 25 oPC
I 70 PoC
I 100
6.4/69 µs P 6.4/69 µs P 6.4/69 µs
6.4/69 µs
6.4/69 µs
6.4/69 µs
A
A
A
A
A
A
543
445
380
543 486
445 398
380340
486 416
398 341
340291
416
341
291
366
300
256
366 324
300 266
256227
324 294
266 241
227206
294
241
206
251
206
176
251 205
206 168
176144
205 171
168 140
144120
171
140
120
154
126
108
110
90.2
154
126
10877.0
110 103
90.284.5
77.072.1
103 93.6
84.576.7
72.165.5
2
3
4
5
2
3
4
5
125V/10A 300V/60A 750V/150A 1600V/320A
125V/10A 300V/60A 750V/150A 1600V/320A
A
A
A
A
A
A
A
A
23.1
58.2
148.2
318.2
23.1
58.2
148.2
318.2
22.9
57.9
147.9
317.9
22.9
57.9
147.9
317.9
22.6
57.6
147.6
317.6
22.6
57.6
147.6
317.6
22.8
57.2
147.2
317.3
22.8
57.2
147.2
317.3
21.9
56.9
146.9
316.9
21.9
56.9
146.9
316.9
21.6
56.6
146.6
316.6
21.6
56.6
146.6
316.6
21.0
56.0
146.0
316.0
20.1
55.1
145.1
21.0
56.0
146.0
316.0
19.2
54.2
144.2
20.1
55.1
145.1
19.2
54.2
144.2
18.5
53.5
143.5
15.9
50.9
140.9
18.5
53.5
143.5
15.3
50.3
15.9
50.9
140.9
15.3
50.3
14.3
49.3
C oC
OverOver
limitlimit
25 o25
VWM
Conversion
to 6.4/69
IP Values
Conversion
to 6.4/69
µs Iµs
P Values
Over limit 25 oC o
Over limit 25 C
1500
TVS @10/1000
1500 W
TVSW@10/1000
µs µs
Waveform
RTCA/DO-160E
using
1500
W
Diodes
Waveform
44 RTCA/DO-160E
using
1500
W TVS
TVS
Diodes
Waveform
4 RTCA/DO-160
using
1500
W
TVS
Diodes
Microsemi
MicrosemiTVs
TVsPart
PartNumbers
Numbers
compliant
complianttotoRTCA/DO-160E
RTCA/DO-160
Standard Capacitance
Standard Capacitance
• Axial Lead
• Axial
Lead
1.5KE6.8A-400A
1.5KE6.8A-400A, CA
1N5629A-1N5665A
1N5629A-1N5665A
1N5907,
1N5908
1N5907, 1N5908
1N6036A-1N6072A
1N6036A-1N6072A
1N6138A-1N6073A
1N6138A-1N6073A
1N6027A-1N60303A
1N6469-1N6476
1N6469-1N6476
1N8110-1N8146
• Surface Mount
• Surface Mount
SMCJ(G)5.0A-170A, CA
SMCJ5.0A-170A, CA
Low capacitance
Capacitance
Low
AxialLead
Lead
•• Axial
LC6.5-170A
LC6.5-170A
31.0 28.1
LCE6.5-170A
LCE6.5-170A
23.2
77.2
63.3
54.0
12.1
47.1
33
28.1
93.6
76.7
65.5
14.3
49.3
•
Surface
Mount
19.4
64.6
52.0
45.2
9.5
44.5
• Surface Mount
40
64.5
23.2
77.2
63.3
54.0
12.1
47.1
SMCJLCE6.5-170A
SMCJ(G)LCE6.5-170A
48
77.4
19.4
64.6
52.0
45.2
9.5
44.5
50
80.0
18.2
60.6
49.6
42.4
9.0
44.0
60
96.8
15.5
51.6
42.3
36.1
5.6
40.6
Except for 1Nxxxx part numbers shown
50
80.0
18.2
60.6
49.6
42.4
9.0
44.0
70
113
13.3
44.2
36.2
30.9
2.4
37.4
that already have military qualifications,
60
96.8
15.5
51.6
42.3
36.1
5.6
40.6
80 113 126
34.8
add M prefix for source control or
70
13.3 11.4
44.2 38.0
36.231.2
30.926.6
2.4 0
37.4
90
146
10.3
34.7
28.1
24.0
30.8
MA, MX, or MXL for further upgrade
80
126
11.4
38.0
31.2
26.6
0
34.8
100
162
9.3
31.0
25.4
21.7
27.6
screening options on plastic devices as
90
146
10.3
34.7
28.1
24.0
30.8
described in Micronote 129.
*
Surge
currents
are
reduced
by
clamping
voltage
(see
Eq.1).
In
the
table
above,
the
first
three
columns,
V
,
V
,
and
I
1500
W
are
taken
from
the data sheet while the subsequent
100
162
9.3
31.0
25.4
21.7
27.6 WM C
PP
0
0
three columns of 6.4/69 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since
TVS are
devices
require
higher (see
temperatures.
*16
Surgemany
currents
reduced
by derating
clampingforvoltage
Eq.1). In the table above, the first three columns, VWM, VC, and IPP 1500 W are taken from the data sheet while the subsequent
0
0
TM
three columns of 6.4/69 µs data were derived as illustrated earlier in this document
and also
MicroNote
127. The 70 C and 100 C curves were added for simplifying selection since
© 2006
Microsemi
Corporation
many TVS devices require derating for higher temperatures.
33 48.4 53.3
40
64.5
53.3
48
77.4
www.Microsemi.com Rev 1: 11/2013
16
Copyright © 2013 Microsemi Corp.
MicroNote 132
Aircraft Lightning Protection
Graph 4: RTCA/DO-160, Waveform 4, Levels 2 through 5, 3000 W TVS Series
4
Waveform
4
RTCA/DO-160E
using
3,000
W
TVS
Waveform
4 RTCA/DO-160
using
3000
TVSDiodes
Diodes
Waveform
4
RTCA/DO-160E
using
3,000
WW
TVS
Diodes
Conversion
to 6.4/69
IP Values
W TVS @10/1000
µs Conversion
to 6.4/69
µs IP µs
Values
3000 W 3000
TVS @10/1000
µs
VWM
VWMV
V
V
5
6
7
8
9
10
12
15
18
33
40
48
V
o
o
o
VIC 3000 IW
PP 3000 W IP 25 oCIP 25 CIP 70 oCIP 70 CIP 100 IoPC100 C
PP
10/1000 µs6.4/69 µs
6.4/69 µs
6.4/69 µs
µs
10/1000 µs
6.4/69 µs
6.4/696.4/69
µs
V
A
A
A
A
A
A
5
9.2
6
10.3
7
9.2
326
10.3
291
12.0
326
291
250
8
913.6
1015.4
13.6
15.4 221
17.0 195
221
195
176
12
1519.9
1824.4
19.9
24.4 151
29.2 123
151
123
103
12.0
17.0
29.2
20
2832.4
3045.4
48.4
250
176
103
32.4
45.4 92.6
48.4 66.0
62.0
92.6
66.0
62.0
33
4053.3
4864.5
53.3
64.5 56.2
77.4 46.4
56.2
46.4
38.8
5077.4
60
82.4
70
82.4 38.8
96.8
36.4
113
36.4
31.0
26.6
1085
969
832
736
649
586
502
409
343
308
220
206
187
154
129
A
1085
969
832
736
649
586
502
409
343
308
220
206
187
154
129
889
794
682
603
532
480
412
335
281
252
180
169
153
126
105
A
889
794
682
603
532
480
412
335
281
252
180
169
153
126
105
759
759
678
678
582
582
515
515 454
454 410
410
351
351 286
286 240
240
215
215 154
154 144
144
130
130 107
107 90.3
2
2
3 3
4 4
5 5
125V/10A
300V/60A
750V/150A
1600V/320A
125V/10A
300V/60A
750V/150A
1600V/320A
A
A
A A
A A
A A
23.2
23.2
22.9
22.9
22.6
22.6
22.8
22.8 21.9
21.9 21.6
21.6
21.0
21.0 20.1
20.1 19.2
19.2
18.5
18.5 15.9
15.9 15.3
15.3
14.3
14.3 12.1
12.1 9.5
58.1
58.1
57.9
57.9
57.6
57.6
57.2
57.256.9
56.956.6
56.6
56.0
56.055.1
55.154.2
54.2
53.5
53.550.3
50.350.3
50.3
49.3
49.347.1
47.144.5
148.2
148.2
147.9
147.9
147.6
147.6
147.2
147.2
146.9
146.9
146.6
146.6
146.0
146.0
145.1
145.1
144.1
144.1
143.5
140.9
143.5
140.3
140.9
140.3
139.3
137.1
139.3
138.5
137.1
318.1
318.1
317.9
317.9
317.6
317.6
317.3
317.3
317.0
317.0
316.6
316.6
316.0
316.0
315.1
315.1
314.1
314.1
313.5
310.9
313.5
310.3
310.9
310.3
MicrosemiTVS
TVsPart
PartNumbers
Numbers
Microsemi
complianttotoRTCA/DO-160
RTCA/DO-160E
compliant
StandardCapacitance
Capacitance
Standard
•
Surface
Mount
• Surface Mount
SMLJ(G)5.0A-170A, CA
SMLJ5.0A-170A, CA
Add M prefix for the part numbers
shown to add source control or
MA, MX, or MXL for further
upgrade screening options on
plastic devices as described in
Micronote 129.
120
103
88.6
www.Microsemi.com Rev 1: 11/2013
17
Over limit 25 oC
120
103
88.6
Over limit 25 oC
9.5 8.5
44.543.5 138.5
98.4 90.3 84.0
134.2
84.5
72.1
5.6
40.6
98.4
84.0
8.5
43.5
134.2
72.6
62.0
2.4
37.4
96.8
31.0
84.5
72.1
5.6
40.6
113
26.6
72.6
62.0
2.4
37.4
80
126
22.8
75.9
62.2
53.1
0
34.8
90
146
20.6
68.6
56.2
48.0
30.8
80
126
22.8
75.9
62.2
53.1
0
34.8
100
162
18.6
61.9
50.7
43.3
27.6
90
146
20.6
68.6
56.2
48.0
30.8
100 * Surge
162currents are
18reduced
.6
61.9 voltage (see
50.7Eq.1). In the
43.table
3
27.6 VWM, VC, and IPP 3000 W are taken from the data sheet while the subsequent
by clamping
above, the first three columns,
0
0
three columns of 6.4/69 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since
* Surge currents
aredevices
reduced
by clamping
(see
Eq.1). In the table above, the first three columns, VWM, VC, and IPP 3000 W are taken from the data sheet while the subsequent
many TVS
require
deratingvoltage
for higher
temperatures.
0
0
three columns of 6.4/69 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since
© 2006 Microsemi Corporation
many TVS devices require derating for higher temperatures.
50
60
70
MicroNote is a trademark of Microsemi Corporation
Graph 4
20
28
30
C
Surge
Currents
Curves
PeakPeak
Surge
Currents
for for
thethe
RedRed
Curves
* *
IS Threat
for Levels
shown
on graph
IS Threat
for Levels
shown
on graph
Threat
Levels
Threat
Levels
2-52-5
Over limit 25 oC
Over limit 25 oC
DataPoints
Points
for
Curves
in Graph
Data
Points
for Curves
in Graph
Data
for
Curves
in Graph
4 4
17
MicroNote 132
Aircraft Lightning Protection
Graph 5: RTCA/DO-160, Waveform 4, Levels 3 through 5, 5000 W TVS Series
W TVS
@10/1000
50005000
W TVS
@10/1000
µs µs
VWM
V
5
6
7
8
9
10
Graph 5
12
15
18
20
28
30
36
40
50
60
70
80
VWM
V
5
6
7
8
9
10
12
15
18
20
28
30
36
40
50
60
70
80
90
100
110
VC
V
VC
V
9.2
9.2 10.3
10.3 12.0
12.0
13.6
I
5000 W
PP W
IPP 5000
10/1000 µs
10/1000 µs
A
A
543
543 485
485 417
417
367
WaveformWaveform
4 RTCA/DO-160E
RTCA/DO-160E
using
5000
WW
TVS
Diodes
Waveform
4
using
5000
TVS
Diodes
4 RTCA/DO-160
using
5000
W
TVS
Diodes
Conversion
6.4/69
Values
Conversion
to to
6.4/69
µsµsIPIPValues
o
o
1808
1808
1615
1615
1389
1482
1482
1316
1316
1138
I 25 C
I 70 C
IP 25P oC
IP 70P oC
6.4/69 µs
6.4/69 µs
6.4/69 µs
6.4/69 µs
A
A
A
A
1389
1222
1138
1002
I 100 oC
**
Peak Surge
Surge Currents
Currents for
Peak
for the
theRed
RedCurves
Curves
Threat for
for Levels
IISSThreat
Levelsshown
shownon
ongraph
graph
Threat Levels
Threat
Levels3-5
3-5
P
oC
IP 100
6.4/69 µs
6.4/69 µs
A
A
3
300V/60A
300V/60A
A
A
3
4
4
750V/150A
750V/150A
A
5
5
1600V/320A
1600V/320A
A
1266
1266
1124
1124
972
58.2
58.2
57.9
57.9
57.6
148.2
148.2
147.9
147.9
147.6
318.2
318.2
317.9
317.9
317.6
57.2
147.2
147.2
146.9
146.9
146.6
317.3
317.3
317.0
317.0
316.6
56.0
55.1
56.0
54.2
55.1
146.0
145.1
146.0
144.2
145.1
972
57.6
855
13.6 15.4
15.4 17.0
17.0
367 325
325 294
294
1222
1082
1082979
979
1002
889
889
803
803
855
757
757
685
685
57.2
56.9
56.9
56.6
56.6
29.2
172
19.9
19.9 24.4
24.4 29.2
251
251 206
206 172
835
835686
686572
684
562
684
469
562
584
480
584
400
480
572
469
400
54.2
32.4 45.4
45.4 48.4
48.4 58.1
154 110
110 103
103 86
512366
366342
342286
300
420
280
300
280
234
256
358
239
256
239
200
50.9
53.5
50.3
50.9
50.3
48.3
64.5
58.1
80.0
78
86
60
260
286
200
213
234
164
182
200
140
47.1
48.3
44.0
32.4
64.5
80.0 96.8
113
96.8 126
113
126 146
162
154
78
60 52
44
52 40
44
40 113
31
512
260
200173
146
173133
146
133 34
103
420
213
142
164
119
142
109
119
92.7
109
84.5
358
53.5
182
121
140
47.1
40.6
44.0
102
37.4
121
93.1
102
79.1
93.1
40.6
34.8
37.4
30.8
34.8
72.1
27.6
A
147.6
146.6
144.2
A
317.6
316.6
316.0
315.1
316.0
314.0
315.1
313.5
310.9
313.5
310.3
310.9
140.3
138.4
137.1
138.4
134
310.3
308.3
307.1
308.3
304.0
127
131
124
127
121
124
118
121
115
Standard Capacitance
Standard Capacitance
• Axial Lead
• 5KP5.0A
Axial Lead
- 110, CA
5KP5.0A - 110, CA
• Surface Mount
PLAD5KP5.0A - 110A, CA
Add M prefix
for the part numbers
(In development)
shown to add source control or
MA, MX, or MXL for further
upgrade screening options on
plastic devices as described in
Micronote 129.
314.0
143.5
140.9
143.5
140.3
140.9
137.1
131
134
Microsemi
TVsTVS
PartPart
Numbers
Microsemi
Numbers
compliant
to RTCA/DO-160E
compliant
to RTCA/DO-160
307.1
304.0
o
Over limit
Over limit
25 oC 25 C
Data
Points
for
Curves
in
Graph
Data
Points
for
Curves
Graph
Data
Points
for
Curves
in in
Graph
5 55
90
146 177
113 28
3493.2
92.7
79.1
30.8
76.4
65.2
24.6
100
162
31
103
84.5
72.1
27.6
118
are reduced
voltage (see 76.4
Eq.1). In the table
VWM,115
VC, and IPP 5000 W are taken from the data sheet while the subsequent
110* Surge currents
177
28 by clamping93.2
65.2above, the first three
24.6 columns,
0
0
TM
three columns of 6.4/69 µs data were derived as illustrated earlier in this document and also MicroNote
127. The 70 C and 100 C curves were added for simplifying selection since
many
TVS devices
requirebyderating
for voltage
higher temperatures.
* Surge
currents
are reduced
clamping
(see Eq.1). In the table above, the first three columns, VWM, VC, and IPP 5000 W are taken from the data sheet while the subsequent
0
0
18
three columns of 6.4/69 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since
© 2006 Microsemi Corporation
many TVS devices require derating for higher temperatures.
www.Microsemi.com Rev 1: 11/2013
18
Copyright © 2013 Microsemi Corp.
MicroNote 132
Aircraft Lightning Protection
Graph 6: RTCA/DO-160, Waveform 4, Levels 3 through 5, 6500 W TVS Series
Waveform 4 RTCA/DO-160E
using 6500 W TVS Diodes
Data Points for Curves in Graph 6
6500 W TVS @10/1000 µs
VWM
VC
Waveform 4 RTCA/DO-160 using 6500 W TVS Diodes
Conversion to 6.4/69 µs IP Values
Peak Surge Currents for the Red Curves*
IS Threat for Levels shown on graph
Threat Levels 3-5
IP 25 oC
6.4/69 µs
A
IP 70 oC
6.4/69 µs
A
IP 100 oC
6.4/69 µs
A
3
300V/60A
A
4
750V/150A
A
5
1600V/320A
A
V
10
11
12
17.0
18.2
19.9
383
358
327
1275
1192
1089
1045
977
893
892
834
762
56.6
56.4
56.0
146.6
146.4
146.0
316.6
316.4
316.0
13
14
15
21.5
23.2
24.4
302
280
267
1006
932
889
825
764
729
704
652
622
55.7
55.4
55.1
145.7
145.4
145.1
315.7
315.4
315.1
16
17
18
26.0
27.6
29.2
250
236
223
833
786
743
683
645
609
583
550
520
54.8
54.5
54.2
144.8
144.5
144.2
314.8
314.5
314.0
20
22
24
32.4
35.5
38.9
202
183
167
673
609
556
552
499
456
471
426
389
53.5
52.9
52.2
143.5
142.9
142.2
313.5
312.9
312.2
26
28
30
42.1
45.5
48.4
154
143
135
513
476
450
421
390
369
359
333
315
51.6
50.9
50.3
141.6
140.9
140.3
311.6
310.9
310.3
33
36
40
53.3
58.1
64.5
123
111
101
410
370
336
336
303
276
287
259
235
49.3
48.3
47.1
139.3
138.4
137.1
309.3
308.3
307.1
43
45
48
69.4
72.7
77.4
93
89
85
310
296
283
254
243
232
217
207
198
46.1
45.5
44.5
136.1
135.5
134.5
Over Limit
25°C
Standard Capacitance
• Surface Mount
PLAD6.5KP10A – 48A, CA
306.1
* Surge currents are reduced by clamping voltage (see Eq 1). In the table above, the first three column (VWM, VC, and IPP) are taken from the data sheet while the subsequent three
0
0
columns of 6.4/69 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since many
TVS devices require derating for higher temperatures.
www.Microsemi.com Data Points
Rev 1: 11/2013
19
for Curves
in Graph 6
MicroNote is a trademark of Microsemi Corporation
Graph 6
V
IPP 6500 W
10/1000 µs
A
Microsemi TVS Part Numbers
compliant to RTCA/DO-160
MicroNote 132
Aircraft Lightning Protection
Graph 7: RTCA/DO-160, Waveform 4, Levels 3 through 5, 7500 W TVS Series
Waveform 4 RTCA/DO-160E
using 7500 W TVS Diodes
Data Points for Curves in Graph 7
7500 W TVS @10/1000 µs
Graph 7
VWM
VC
Waveform 4 RTCA/DO-160 using 7500 W TVS Diodes
Conversion to 6.4/69 µs IP Values
Peak Surge Currents for the Red Curves*
IS Threat for Levels shown on graph
Threat Levels 3-5
IP 25 oC
6.4/69 µs
A
IP 70 oC
6.4/69 µs
A
IP 100 oC
6.4/69 µs
A
3
300V/60A
A
4
750V/150A
A
5
1600V/320A
A
V
V
IPP 7500 W
10/1000 µs
A
10
11
12
17.0
18.2
19.9
441
412
377
1469
1372
1255
1205
1125
1029
1028
960
878
56.6
56.4
56.0
146.6
146.4
146.0
316.6
316.4
316.0
13
14
15
21.5
23.2
24.4
349
323
307
1162
1076
1022
953
882
838
813
753
715
55.7
55.4
55.1
145.7
145.4
145.1
315.7
315.4
315.1
16
17
18
26.0
27.6
29.2
288
272
257
959
906
856
786
743
702
671
634
599
54.8
54.5
54.2
144.8
144.5
144.2
314.8
314.5
314.0
20
22
24
32.4
35.5
38.9
231
211
193
769
703
643
631
576
527
538
492
450
53.5
52.9
52.2
143.5
142.9
142.2
313.5
312.9
312.2
26
28
30
42.1
45.5
48.4
178
165
155
593
549
516
486
450
423
415
384
361
51.6
50.9
50.3
141.6
140.9
140.3
311.6
310.9
310.3
33
36
40
53.3
58.1
64.5
141
129
116
470
430
386
385
353
317
329
301
270
49.3
48.3
47.1
139.3
138.4
137.1
309.3
308.3
307.1
43
45
48
69.4
72.7
77.4
108
103
97
360
343
323
295
281
265
252
240
226
46.1
45.5
44.5
136.1
135.5
134.5
306.1
305.5
304.5
Microsemi TVS Part Numbers
compliant to RTCA/DO-160
Standard Capacitance
• Surface Mount
PLAD7.5KP10A – 48A, CA
* Surge currents are reduced by clamping voltage (see Eq 1). In the table above, the first three column (VWM, VC, and IPP) are taken from the data sheet while the subsequent three
0
0
columns of 6.4/69 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since many
TVS devices require derating for higher temperatures.
www.Microsemi.com Data
Rev 1: 11/2013
Points for20Curves in Graph 7
Copyright © 2013 Microsemi Corp.
MicroNote 132
Aircraft Lightning Protection
Graph 8: RTCA/DO-160, Waveform 4, Levels 4 through 5, 15,000 W TVS Series
Waveform 4 RTCA/DO-160
using 15,000 W TVS Diodes
Data Points for Curves in Graph 8
Waveform 4 RTCA/DO-160 using 15,000 W TVS Diodes
Peak Surge Currents for the Red Curves*
IS Threat for Levels shown on graph
Threat Levels 4-5
Conversion to 6.4/69 µs IP Values
VWM
V
IPP 15,500 W
10/1000 µs
A
IP 25 oC
6.4/69 µs
A
IP 70 oC
6.4/69 µs
A
IP 100 oC
6.4/69 µs
A
4
750V/150A
A
5
1600V/320A
A
7.0
9.0
10
12.0
15.4
17.0
1251
975
882
4166
3247
2937
3416
2663
2408
2916
2273
2056
148
147
147
318
317
317
12
14
16
19.9
23.2
26.0
753
645
576
2507
2148
1918
2055
1761
1573
1755
1504
1343
146
145
145
316
315
315
18
22
26
29.2
35.5
42.1
516
423
357
1718
1409
1189
1409
1155
975
1207
986
823
144
143
142
314
313
312
30
36
43
48.4
58.1
69.4
309
258
216
1029
859
719
844
704
590
720
601
503
140
138
136
310
308
306
48
54
60
77.4
87.1
96.8
195
171
156
649
569
519
532
467
426
454
398
363
135
133
131
305
303
301
70
90
130
113
146
209
132
102
71
440
340
236
361
279
194
308
238
165
127
121
108
297
291
160
200
280
259
322
452
58
47
33
193
157
110
158
129
90.0
135
110
77.0
98.2
85.6
59.6
V
VC
Microsemi TVS Part Numbers
compliant to RTCA/DO-160
Standard Capacitance
• Axial Lead
15KP22A – 280A, CA
• Surface Mount
PLAD15KP7.0A – 200A, CA
Add M prefix for the part numbers
shown to add source control or
MA, MX, or MXL for further upgrade
screening options on plastic devices
as described in Micronote 129.
Over Limit 25°C
* Surge currents are reduced by clamping voltage (see Eq 1). In the table above, the first three column (VWM, VC, and IPP) are taken from the data sheet while the subsequent three
0
0
columns of 6.4/69 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since many
TVS devices require derating for higher temperatures.
www.Microsemi.com Data Points
Rev 1: 11/2013
21
for Curves
in Graph 8
MicroNote is a trademark of Microsemi Corporation
Graph 8
15,000 W TVS @10/1000 µs
MicroNote 132
Aircraft Lightning Protection
Graph 9: RTCA/DO-160, Waveform 4, Levels 4 through 5, 30,000 W TVS Series
Waveform 4 RTCA/DO-160
Data Points for Curves in Graph 9
Waveform 4 RTCA/DO-160 using 30,000 W TVS Diodes
Peak Surge Currents for the Red Curves*
IS Threat for Levels shown on graph
Threat Levels 4-5
30,000 W TVS @10/1000 µs
Conversion to 6.4/69 µs IP Values
VWM
IP 25 oC
6.4/69 µs
A
IP 70 oC
6.4/69 µs
A
IP 100 oC
6.4/69 µs
A
4
750V/150A
A
5
1600V/320A
A
V
IPP 30,000 W
10/1000 µs
A
14
16
18
24.0
27.2
30.8
1251
1101
975
4166
3666
3247
3416
3006
2663
2916
2566
2273
145.2
144.6
143.8
315.2
314.6
313.8
22
26
30
36.4
43.0
48.8
822
696
618
2737
2318
2058
2244
1901
1688
1916
1623
1441
142.7
141.4
140.2
312.7
311.4
310.2
36
43
48
58.1
69.4
77.4
516
432
390
1718
1439
1299
1409
1180
1065
1203
1007
909
138.3
136.1
134.5
308.4
306.1
304.5
54
60
70
87.1
96.8
113
342
312
264
1139
1039
879
934
852
721
797
727
615
132.6
130.6
127.4
302.6
300.6
297.4
78
90
110
126
146
177
240
204
168
799
679
559
655
557
458
559
475
391
124.8
120.8
114.6
294.8
290.8
284.6
130
160
180
209
259
291
142
116
104
473
386
346
388
317
284
331
270
242
108.2
98.2
91.8
278.2
268.2
261.8
220
300
400
356
483
644
84
62
46
280
206
153
230
169
125
196
144
107
78.8
53.4
21.2
248.8
Over Limit
25°C
V
Graph 9
using 30,000 W TVS Diodes
VC
Microsemi TVS Part Numbers
compliant to RTCA/DO-160
Standard Capacitance
• Surface Mount
PLAD30KP14A – 400A, CA
Add M prefix for the part numbers
shown to add source control or
MA, MX, or MXL for further upgrade
screening options on plastic devices
as described in Micronote 129.
* Surge currents are reduced by clamping voltage (see Eq 1). In the table above, the first three column (VWM, VC, and IPP) are taken from the data sheet while the subsequent three
0
0
columns of 6.4/69 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since many
TVS devices require derating for higher temperatures.
www.Microsemi.com MicroNote is a trademark of Microsemi Corporation
Data Points for22Curves in Graph 9
Rev 1: 11/2013
MicroNote 132
Aircraft Lightning Protection
Graph 10: RTCA/DO-160, Waveform 5A, Levels 1 through 2, 500 W TVS Series
Data
Points
for
Curves
in in
Graph
10108
Data
Points
for
Curves
Graph
Data
Points
for
Curves
in
Graph
500500
WW
TVS
@10/1000
µs µs
TVS
@10/1000
oC o
oC o
oC o
IP 25
IP 25
C IP 70
IP 70
C IP 100
IP 100
C
40/120
µs µs 40/120
µs µs 40/120
µs µs
40/120
40/120
40/120
A A
A A
A A
Peak
Surge
Currents
for for
thethe
RedRed
Curves
* *
Peak
Surge
Currents
Curves
IS Threat
for for
Levels
shown
on graph
IS Threat
Levels
shown
on graph
Threat
Levels
1-21-2
Threat
Levels
1 1
2 2
50V/50A
50V/50A125V/125A
125V/125A
A A
A A
V V
5 5
6 6
7 7
9.29.2
10.3
10.3
12.0
12.0
54.3
54.3
48.5
48.5
41.7
41.7
126126
113113
97.2
97.2
103103
92.7
92.7
79.7
79.7
88.2
88.2
79.1
79.1
68.3
68.3
40.8
40.8
39.7
39.7
38.0
38.0
116116
114114
113113
8 8
9 9
10 10
13.6
13.6
15.4
15.4
17.0
17.0
36.7
36.7
32.5
32.5
29.4
29.4
85.5
85.5
75.7
75.7
68.5
68.5
70.1
70.1
62.1
62.1
56.1
56.1
59.8
59.8
53.0
53.0
47.9
47.9
36.4
36.4
34.6
34.6
33.0
33.0
112112
110110
108108
12 12
15 15
18 18
19.9
19.9
24.4
24.4
29.2
29.2
25.1
25.1
20.6
20.6
17.2
17.2
58.5
58.5
48.0
48.0
40.1
40.1
48.0
48.0
39.3
39.3
32.9
32.9
41.0
41.0
33.6
33.6
28.1
28.1
30.1
30.1
25.6
25.6
20.8
20.8
105105
101101
96.8
96.8
20 20
28 28
30 30
32.4
32.4
45.4
45.4
48.4
48.4
15.4
15.4
11.0
11.0
10.3
10.3
35.9
35.9
25.6
25.6
24.0
24.0
29.4
29.4
21.0
21.0
19.7
19.7
25.1
25.1
17.9
17.9
16.8
16.8
17.1
17.1
4.64.6
1.61.6
91.6
91.6
79.0
79.0
76.6
76.6
36 36
40 40
48 48
53.3
53.3
64.5
64.5
77.4
77.4
8.68.6
7.87.8
6.56.5
20.0
20.0
18.1
18.1
15.1
15.1
16.4
16.4
14.8
14.8
12.4
12.4
14.0
14.0
12.7
12.7
10.6
10.6
71.7
71.7
60.5
60.5
47.6
47.6
50 50
60 60
70 70
82.4
82.4
96.8
96.8
113113
6.06.0
5.25.2
4.44.4
14.0
14.0
12.1
12.1
10.2
10.2
11.5
11.5
9.99.9
8.48.4
9.89.8
8.48.4
7.17.1
42.6
42.6
28.2
28.2
12.0
12.0
80 80
90 90
100100
126126
146146
162162
4.04.0
3.43.4
3.13.1
9.39.3
7.97.9
7.27.2
7.67.6
6.56.5
5.95.9
6.56.5
5.55.5
5.05.0
Devices
Devices
> 78
>V
78WM
VWM
within
limits
within
limits
Microsemi
TVSTVs
PartPart
Numbers
Microsemi
Numbers
compliant
to RTCA/DO-160
compliant
to RTCA/DO-160E
Standard
Capacitance
Standard
Capacitance
• Axial
Lead
• Axial
Lead
P5KE5.0A-170A,
CA CA
P5KE5.0A-170A,
1N6103A-1N6137A
1N6103A-6137A
1N6461-1N6468
1N6461-6468
1N8073-1N8109
• Surface Mount
SMAJ5.0A-170A, CA
Low Capacitance
Low
capacitance
• Axial
Lead
SAC5.0-50
• Axial Lead
SAC5.0-50
• Surface
Mount
SMBJSAC5.0-50
• Surface Mount
HSMBJSAC5.0-50
Except for 1Nxxxx part numbers shown
that already have military qualifications,
add M prefix for source control or
MA, MX, or MXL for further upgrade
screening options on plastic devices as
described in Micronote 129.
* Surge
currents
areare
reduced
by by
clamping
voltage
(see
Eq.1).
In the
table
above,
thethe
firstfirst
three
columns,
VWMV, VC,,Vand
IPP I500500
W are
taken
from
the the
datadata
sheet
while
the the
subsequent
* Surge
currents
reduced
clamping
voltage
(see
Eq.1).
In the
table
above,
three
columns,
W
are
taken
from
sheet
while
subsequent
0
0
WM
C, and
PP
TM
0
0
three
columns
of 40/120
µs µs
data
were
derived
as as
illustrated
earlier
in this
document
andand
alsoalso
MicroNote
TheThe
70 70
C and
100100
C curves
were
added
for simplifying
selection
since
TM
three
columns
of 40/120
data
were
derived
illustrated
earlier
in this
document
MicroNote127.
127.
C and
C curves
were
added
for simplifying
selection
since
many
TVS
devices
require
derating
for
higher
temperatures.
many TVS devices require derating for higher temperatures.
www.Microsemi.com © 2006 Microsemi
23 Corporation
Rev 1: 11/2013
MicroNote is a trademark of Microsemi Corporation
Graph 10
V V
IPP I500500
W W
PP
10/1000
µs µs
10/1000
A A
WM
VC V
C
Conversion
to 40/120
µs µs
IP Values
Conversion
to 40/120
IP Values
Over limit 25 oC
Over limit 25 oC
VWM
V
Waveform
5A RTCA/DO-160
using
500
W
TVS
Diodes
Waveform
5A
using
500
WW
TVS
Diodes
Waveform
5ARTCA/DO-160E
RTCA/DO-160E
using
500
TVS
Diodes
21
MicroNote 132
Aircraft Lightning Protection
Graph 11: RTCA/DO-160, Waveform 5A, Levels 1 through 2, 600 W TVS Series
600W
WTVS
TVS @10/1000
@10/1000 µs
µs
600
Graph 11
WM
VVWM
22
VVCC
V
V
V
V
5
5
6
6
7
7
8
89
9
10
10
12
12
15
15
18
18
20
20
28
28
30
30
36
40
36
48
40
48
50
60
50
70
60
9.2
9.2
10.3
10.3
12.0
12.0
13.6
13.6
15.4
15.4
17.0
17.0
19.9
19.9
24.4
24.4
29.2
29.2
32.4
32.4
45.4
45.4
48.4
48.4
58.1
64.5
58.1
77.4
64.5
77.4
82.4
96.8
82.4
113
96.8
600 W
PP 600
IIPP
W
10/1000 µs
10/1000 µs
A
A
62.2
62.2
58.3
58.3
50.0
50.0
44.1
44.1
39.0
39.0
35.3
35.3
30.2
30.2
24.0
24.0
20.5
20.5
18.5
18.5
13.2
13.2
12.4
12.4
10.3
9.3
10.3
7.7
9.3
7.7
7.1
6.2
7.1
5.3
6.2
70
80
90
80
100
90
113
126
146
126
162
146
5.3
4.7
4.1
4.7
3.7
4.1
Waveform
5A RTCA/DO-160
usingW600
W TVS
Diodes
Waveform 5A
RTCA/DO-160E
using 600
TVS
Diodes
Conversion
Conversiontoto40/120
40/120µsµsIPIPValues
Values
IP 25 ooC
IP 25 C
40/120 µs
40/120 µs
A
A
IP 70 ooC
IP 70 C
40/120 µs
40/120 µs
A
A
IP 100 oCo
IP 100 C
40/120 µs
40/120 µs
A
A
151
151
136
136
116
116
103
103
90.8
90.8
82.2
82.2
70.4
70.4
55.9
55.9
47.8
47.8
43.1
43.1
30.7
30.7
28.9
28.9
24.0
21.7
24.0
17.9
21.7
17.9
16.5
14.4
16.5
12.3
14.4
124
124
112
112
95.1
95.1
84.5
84.5
74.4
74.4
67.4
67.4
57.7
57.7
45.8
45.8
39.2
39.2
35.3
35.3
25.2
25.2
23.7
23.7
19.7
17.8
19.7
14.7
17.8
14.7
13.5
11.8
13.5
10.1
11.8
106
106
95.2
95.2
81.2
81.2
72.1
72.1
63.6
63.6
57.5
57.5
49.3
49.3
39.1
39.1
33.4
33.4
30.2
30.2
21.5
21.5
20.2
20.2
16.8
15.2
16.8
12.5
15.2
12.5
11.6
10.1
11.6
8.6
10.1
12.3
10.9
9.6
10.9
8.6
9.6
10.1
8.9
7.9
8.9
7.0
7.9
8.6
7.6
6.7
7.6
6.0
6.7
* *
Peak
Surge
Currents
forfor
thethe
RedRed
Curves
Peak
Surge
Currents
Curves
IS Threat
forfor
Levels
shown
on graph
IS Threat
Levels
shown
on graph
Threat
Levels
1-21-2
Threat
Levels
1
2
1
2
50V/50A 125V/125A
50V/50A 125V/125A
A
A
A
A
40.8
40.8
39.7
39.7
38.0
38.0
36.4
36.4
34.6
34.6
33.0
33.0
30.1
30.1
25.6
25.6
20.8
20.8
17.1
17.1
4.6
1.64.6
1.6
116
116
114
114
113
113
111
109111
108109
108
105
101105
95.8101
95.8
92.6
92.6
79.6
79.6
76.6
76.6
66.9
60.5
66.9
47.6
60.5
47.6
42.6
28.2
42.6
12.0
28.2
Over limit 25 oC
Over limit 25 oC
DataPoints
Pointsfor
forCurves
Curves
Graph
Data
ininGraph
119
Microsemi
TVs Part
Numbers
Microsemi
TVS Part
Numbers
compliant
to RTCA/DO-160E
compliant
to RTCA/DO-160
Standard
Capacitance
Standard
Capacitance
• Axial Lead
• Axial Lead
P6KE6.8A-200A, CA
P6KE6.8A-200A, CA
• Surface Mount
• Surface Mount
SMBJ(G)5.0A-170A, CA
SMBJ5.0A-170A, CA
Add M prefix for the part numbers
shown to add source control or
MA, MX, or MXL for further
upgrade screening options on
plastic devices as described in
Micronote 129.
12.0
Devices
> 75 VWM
withinDevices
limits
> 75 VWM
within limits
162are reduced
3.7
8.6 (see Eq.1).
7.0In the table 6.0
* 100
Surge currents
by clamping voltage
above, the first three columns, VWM, VC, and IPP 600 W are taken from the data sheet while the subsequent
0
0
three columns of 40/120 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since
* many
SurgeTVS
currents
are reduced by clamping voltage (see Eq.1). In the table above, the first three columns, VWM, VC, and IPP 600 W are taken from the data sheet while the subsequent
devices require derating for higher temperatures.
0
0
TM
three columns of 40/120 µs data were derived as illustrated earlier in this document and also MicroNote 127. The 70 C and 100 C curves were added for simplifying selection since
many TVS devices require derating for higher temperatures.
© 2006 Microsemi Corporation
www.Microsemi.com Rev 1: 11/2013
24
MicroNote is a trademark of Microsemi Corporation
MicroNote 132
Aircraft Lightning Protection
Graph 12: RTCA/DO-160, Waveform 5A, Levels 1 through 3, 1500 W TVS Series
Data
Pointsfor
forCurves
Curves
Graph
Data
inin
Graph
1210
DataPoints
Points for
Curves
in Graph
10
Conversion
Conversiontoto40/120
40/120µsµsIPIPValues
Values
Peak
**
PeakSurge
SurgeCurrents
Currentsfor
forthe
theRed
RedCurves
Curves
ISIThreat
for
Levels
shown
on
graph
Threat
for
Levels
shown
on
graph
S
Threat
ThreatLevels
Levels1-3
1-3
IPI7070oCoC
P
40/120
40/120µsµs
AA
oCo
IPI100
P 100 C
40/120
40/120µsµs
AA
11
50V/50A
50V/50A
AA
22
125V/125A
125V/125A
AA
33
300/300
300/300
AA
55
66
77
9.2
9.2
10.3
10.3
12.0
12.0
163
163
146
146
125
125
380
380
340
340
291
291
312
312
279
279
239
239
266
266
238
238
203
203
40.8
40.8
39.7
39.7
38.0
38.0
116
116
114
114
113
113
291
291
290
290
288
288
88
99
1010
13.6
13.6
15.4
15.4
17.0
17.0
110
110
97.4
97.4
88.2
88.2
256
256
227
227
206
206
210
210
186
186
169
169
179
179
159
159
144
144
36.4
36.4
34.6
34.6
33.0
33.0
111
111
110
110
108
108
1212
1515
1818
19.9
19.9
24.4
24.4
29.2
29.2
75.3
75.3
61.5
61.5
51.4
51.4
175
175
143
143
120
120
144
144
117
117
98.4
98.4
122
122
100
100
84.0
84.0
30.1
30.1
25.6
25.6
20.8
20.8
105
105
101
101
95.8
95.8
2020
2828
3030
32.4
32.4
45.4
45.4
48.4
48.4
46.3
46.3
33.0
33.0
31.0
31.0
108
108
76.9
76.9
72.2
72.2
88.6
88.6
63.0
63.0
59.2
59.2
75.6
75.6
53.8
53.8
50.5
50.5
17.1
17.1
4.6
4.6
1.6
1.6
92.6
92.6
79.6
79.6
76.6
76.6
3636
4040
4848
58.1
58.1
64.5
64.5
77.4
77.4
28.1
28.1
23.2
23.2
19.4
19.4
65.5
65.5
54.0
54.0
45.2
45.2
53.7
53.7
44.3
44.3
37.1
37.1
45.8
45.8
37.8
37.8
31.6
31.6
66.9
66.9
60.5
60.5
47.6
47.6
5050
6060
7070
82.4
82.4
96.8
96.8
113
113
18.2
18.2
15.5
15.5
13.3
13.3
42.4
42.4
36.1
36.1
31.0
31.0
34.8
34.8
29.6
29.6
25.4
25.4
29.7
29.7
25.2
25.2
21.7
21.7
8080
9090
100
100
126
126
146
146
162
162
11.4
11.4
10.3
10.3
9.3
9.3
26.6
26.6
24.0
24.0
21.7
21.7
21.8
21.8
19.7
19.7
17.8
17.8
18.6
18.6
16.8
16.8
15.2
15.2
42.6
42.6
28.2
28.2
12.0
12.0
Devices
Devices
>60
>60VWM
VWM
within
withinlimits
limits
VCV
VV
WM
C
Over limit 25 oC
Over limit 25 oC
IPI2525oCoC
P
40/120
40/120µsµs
AA
VWM
V
286
Microsemi
MicrosemiTVS
TVsPart
PartNumbers
Numbers
compliant
complianttotoRTCA/DO-160
RTCA/DO-160E
Standard
StandardCapacitance
Capacitance
• •Axial
AxialLead
Lead
1.5KE6.8A-400A,
1.5KE6.8A-400ACA
1N5629A-1N5665A
1N5629A-1N5665A
1N5907,
1N5907,1N5908
1N5908
1N6036A-1N6072A
1N6036A-1N6072A
1N6138A-1N6173A
1N6138A-1N6073A
1N6469-1N6476
1N6027A-1N60303A
1N8110-1N8146
1N6469-1N6476
• •Surface
SurfaceMount
Mount
SMCJ5.0A-170A,
CA CA
SMCJ(G)5.0A-170A,
Low capacitance
Low• capacitance
Axial Lead
LC6.5-170A
• Axial
Lead
LCE6.5-170A
LC6.5-170A
LCE6.5-170A
• Surface
Mount
SMCJLCE6.5-170A
• Surface Mount
SMCJ(G)LCE6.5-170A
Except for 1Nxxxx part numbers shown
that already have military qualifications,
add M prefix for source control or
MA, MX, or MXL for further upgrade
screening options on plastic devices as
described in Micronote 129.
* *Surge
, VV, and
IPPI 1500
W are
WM
Surgecurrents
currentsare
arereduced
reducedbybyclamping
clampingvoltage
voltage(see
(seeEq.1).
Eq.1).InInthe
thetable
tableabove,
above,the
thefirst
firstthree
threecolumns,
columns,VV
aretaken
takenfrom
fromthe
thedata
datasheet
sheetwhile
whilethe
thesubsequent
subsequent
WM, C
C, and
PP 1500 W
0
0
TM
0
0
three
threecolumns
columnsofof40/120
40/120µsµsdata
datawere
werederived
derivedasasillustrated
illustratedearlier
earlierininthis
thisdocument
documentand
andalso
alsoMicroNote
MicroNoteTM127.
127.The
The7070CCand
and100
100CCcurves
curveswere
wereadded
addedforforsimplifying
simplifyingselection
selectionsince
since
many
TVS
devices
require
derating
for
higher
temperatures.
many TVS devices require derating for higher temperatures.
www.Microsemi.com © 2006 Microsemi Corporation
25
Rev 1: 11/2013
Graph 12
VV
IPPI 1500
W
PP 1500 W
10/1000
10/1000µsµs
AA
Over limit 25 oC
Over limit 25 oC
1500
1500WWTVS
TVS@10/1000
@10/1000µsµs
WaveformWaveform
5A RTCA/DO-160E
using
1500
WW
TVS
Diodes
5A RTCA/DO-160
using
1500
TVS
Diodes
Waveform 5A RTCA/DO-160E
using
1500
W TVS
Diodes
MicroNote is a trademark of Microsemi Corporation
23
MicroNote 132
Aircraft Lightning Protection
Graph 13: RTCA/DO-160, Waveform 5A, Levels 1 through 3, 3000 W TVS Series
Data
Points
for
Curves
Graph
Data
Points
for
Curves
in
Graph
13
Data
Points
for
Curves
in in
Graph
11 13
2424
Conversion
to 40/120
IP Values
Conversion
to 40/120
µs Iµs
P Values
o
o
oC oC
IP 100
IP 25IPo25
C C IP 70IPo70
C C IP 100
40/120
40/120
40/120
40/120
µs µs 40/120
µs µs 40/120
µs µs
A A
A A
A A
Peak
Surge
Currents
Curves
* *
Peak
Surge
Currents
for for
thethe
RedRed
Curves
IS Threat
for Levels
shown
on graph
IS Threat
for Levels
shown
on graph
Threat
Levels
Threat
Levels
1-31-3
VWMVWM
VC VC
V V
V V
IPP 3000
IPP 3000
W W
10/1000
10/1000
µs µs
A A
2 2
3 3
125V/125A300V/300A
300V/300A
125V/125A
A A
A A
5 5
6 6
7 7
9.2 9.2
10.310.3
12.012.0
326326
291291
250250
759759
678678
582582
622622
556556
477477
531531
475475
408408
40.840.8
39.739.7
38.038.0
116116
114114
113113
290.8
290.8
289.7
289.7
288288
8 8
9 9
10 10
13.613.6
15.415.4
17.017.0
221221
195195
176176
515515
454454
410410
422422
372372
336336
361361
318318
287287
36.436.4
34.634.6
33.033.0
111 111
110110
108108
286.4
286.4
285285
283283
12 12
15 15
18 18
19.919.9
24.424.4
29.229.2
151151
123123
103103
352352
287287
240240
289289
235235
197197
246246
201201
168168
30.130.1
25.625.6
20.820.8
105105
101101
95.895.8
280280
275275
270
20 20
28 28
30 30
32.432.4
45.445.4
48.448.4
92.692.6
66.066.0
62.062.0
216216
154154
144144
177177
126126
118118
151151
108108
101101
17.117.1
4.6 4.6
1.6 1.6
92.692.6
79.679.6
76.676.6
267
36 36
40 40
48 48
58.158.1
64.564.5
77.477.4
51.651.6
46.446.4
38.838.8
120120
108108
90.490.4
98.498.4
88.688.6
74.174.1
84.084.0
75.675.6
63.363.3
0 0
66.966.9
60.560.5
47.647.6
50 50
60 60
70 70
82.482.4
96.896.8
113113
35.935.9
31.031.0
26.626.6
83.683.6
72.272.2
61.961.9
68.568.5
59.259.2
50.750.7
58.558.5
50.550.5
43.343.3
45.045.0
28.228.2
12.012.0
80 80
90 90
100100
126126
146146
162162
22.822.8
20.620.6
18.618.6
53.153.1
48.048.0
43.343.3
43.543.5
39.439.4
35.535.5
37.237.2
33.633.6
30.330.3
0 0
Microsemi
Numbers
Microsemi
TVsTVS
PartPart
Numbers
compliant
to RTCA/DO-160
compliant
to RTCA/DO-160E
Standard
Capacitance
Standard
Capacitance
• Surface
Mount
• Surface
Mount
SMLJ5.0A-170A, CA
CA
SMLJ(G)5.0A-170A,
Add M prefix for the part numbers
shown to add source control or
MA, MX, or MXL for further
upgrade screening options on
plastic devices as described in
Micronote 129.
limit
25 oC
1 1
50V/50A
50V/50A
A A
Over limit Over
25 oC
Graph 13
3000
W TVS
@10/1000
3000
W TVS
@10/1000
µs µs
Waveform
5A RTCA/DO-160
using
3000
W
TVS
Diodes
Waveform
5ARTCA/DO-160E
RTCA/DO-160E
using
3000
TVS
Diodes
Waveform
5A
using
3000
WW
TVS
Diodes
* Surge
currents
reduced
by clamping
voltage
Eq.1).
In the
table
above,
three
columns,
IPP 3000
W are
taken
sheet
while
subsequent
C, and
* Surge
currents
are are
reduced
by clamping
voltage
(see(see
Eq.1).
In the
table
above,
the the
firstfirst
three
columns,
VWMV, WM
VC,, V
and
IPP 3000
W are
taken
fromfrom
the the
datadata
sheet
while
the the
subsequent
0
0
TM
0
0
TM
three
columns
of 40/120
µs data
were
derived
as illustrated
earlier
in this
document
MicroNote
C and
C curves
were
added
for simplifying
selection
since
three
columns
of 40/120
µs data
were
derived
as illustrated
earlier
in this
document
andand
alsoalso
MicroNote
127.127.
TheThe
70 70
C and
100100
C curves
were
added
for simplifying
selection
since
many
devices
require
derating
for higher
temperatures.
many
TVSTVS
devices
require
derating
for higher
temperatures.
© 2006
Microsemi
Corporation
www.Microsemi.com © 2006
Microsemi
Corporation
26
Rev 1: 11/2013
MicroNote is a trademark of Microsemi Corporation
MicroNote 132
Aircraft Lightning Protection
Graph 14: RTCA/DO-160, Waveform 5A, Levels 2 through 4, 5000 W TVS Series
VC
VC
V
V
5
5
6
6
7
7
8
8
9
9
10
10
12
12
15
15
18
18
20
20
28
28
30
30
36
36
40
40
48
48
50
50
60
60
70
70
80
80
90
90
100
100
V
V
9.2
9.2
10.3
10.3
12.0
12.0
13.6
13.6
15.4
15.4
17.0
17.0
19.9
19.9
24.4
24.4
29.2
29.2
32.4
32.4
45.4
45.4
48.4
48.4
58.1
58.1
64.5
64.5
77.4
77.4
82.4
82.4
96.8
96.8
113
113
126
126
146
146
162
162
I 5000 W
IPPPP5000 W
10/1000 µs
10/1000 µs
A
A
543
543
485
485
417
417
367
367
325
325
294
294
251
251
206
206
172
172
154
154
110
110
103
103
86
86
78.0
78.0
65.0
65.0
60.0
60.0
47.0
47.0
44.0
44.0
49.0
49.0
34.0
34.0
31.0
31.0
IP 25 oC
IP 25 oC
40/120 µs
40/120 µs
A
A
1265
1265
1130
1130
972
972
855
855
757
757
685
685
585
585
480
480
401
401
359
359
256
256
240
240
200
200
182
182
151
151
140
140
109
109
102
102
95.5
95.5
79.2
79.2
72.2
72.2
IP 70 oC
IP 70 oC
40/120 µs
40/120 µs
A
A
1037
1037
927
927
797
797
701
701
621
621
562
562
480
480
394
394
329
329
294
294
210
210
197
197
164
164
149
149
124
124
115
115
89.4
89.4
83.6
83.6
78.3
78.3
64.9
64.9
59.2
59.2
IP 100 oC
IP 100 oC
40/120 µs
40/120 µs
A
A
886
886
791
791
681
681
599
599
530
530
480
480
410
410
336
336
281
281
251
251
179
179
168
168
140
140
127
127
106
106
98.0
98.0
76.3
76.3
71.4
71.4
66.9
66.9
55.4
55.4
50.6
50.6
Peak Surge Currents for the Red Curves*
Peak Surge Currents for the Red Curves*
I Threat for Levels shown on graph
IS SThreat for Levels shown on graph
Threat Levels 2-4
Threat Levels 2-4
2
2
125V/125A
125V/125A
A
A
116
116
114
114
113
113
111
111
110
110
108
108
105
105
101
101
95.8
95.8
92.6
92.6
79.6
79.6
76.6
76.6
66.9
66.9
60.5
60.5
47.6
47.6
45.0
45.0
28.2
28.2
12.0
12.0
0
0
3
4
3
4
300V/300A 750V/750A
300V/300A 750V/750A
A
A
A
A
291
741
291
741
290
740
290
740
288
738
288
738
286
736
286
736
285
734
285
734
283
283
732
280
Over
280
275
limit
275
25 oC
270
270
267
267
254
254
251
Microsemi TVS Part Numbers
Microsemi TVs Part Numbers
compliant to RTCA/DO-160
compliant to RTCA/DO-160E
Standard Capacitance
Standard Capacitance
• Axial Lead
• Axial Lead
5KP5.0A - 110A, CA
5KP5.0A - 110A, CA
• Surface Mount
PLAD5KP5.0A - 110A, CA
(In development)
Add M prefix for the part numbers
shown to add source control or
MA, MX, or MXL for further
upgrade screening options on
plastic devices as described in
Micronote 129.
Over
limit
25 oC
* Surge currents are reduced by clamping voltage (see Eq.1). In the table above, the first three columns, VWM, VC, and IPP 5000 W are taken from the data sheet while the subsequent
* three
Surgecolumns
currentsofare
reduced
by clamping
voltage
Eq.1).earlier
In the in
table
the and
first three
columns, VWM127.
, VC,The
and70
IPP0C
5000
are0Ctaken
from
theadded
data sheet
while the selection
subsequent
40/120
µs data
were derived
as (see
illustrated
this above,
document
also MicroNoteTM
andW
100
curves
were
for simplifying
since
0
0
three
of 40/120
µs data
wereforderived
illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since
manycolumns
TVS devices
require
derating
higher as
temperatures.
many TVS devices require derating for higher temperatures.
www.Microsemi.com © 2006 Microsemi
27 Corporation
Rev 1: 11/2013
MicroNote is a trademark of Microsemi Corporation
Graph 14
VWM
VWM
Conversion to 40/120 µs I Values
Conversion to 40/120 µs IPPValues
Over limit 25 oC
5000 W TVS @10/1000 µs
5000 W TVS @10/1000 µs
Waveform 5A RTCA/DO-160E
using 5000
W TVS
Diodes
5A RTCA/DO-160
5000
TVS
Diodes
Waveform Waveform
5A RTCA/DO-160E
usingusing
5000
WW
TVS
Diodes
Over limit 25 oC
Data Points
Points forCurves
Curves in Graph
14
Data
1412
Data
Points for
for CurvesininGraph
Graph
25
MicroNote 132
Aircraft Lightning Protection
Graph 15: RTCA/DO-160, Waveform 5A, Levels 2 through 4, 6500 W TVS Series
Waveform 5A RTCA/DO-160E
using 6500 W TVS Diodes
Data Points for Curves in Graph 15
Graph 15
VWM
VC
Conversion to 40/120 µs IP Values
Peak Surge Currents for the Red Curves*
IS Threat for Levels shown on graph
Threat Levels 2-4
IP 25 oC
6.4/69 µs
A
IP 70 oC
6.4/69 µs
A
IP 100 oC
6.4/69 µs
A
2
125V/125A
A
3
300V/300A
A
4
750V/750A
A
V
V
IPP 6500 W
10/1000 µs
A
10
11
12
17.0
18.2
19.9
383
358
327
892
834
762
731
684
625
624
584
533
108
107
105
283
282
280
733
732
730
13
14
15
21.5
23.2
24.4
302
280
267
704
652
622
577
535
510
493
456
435
103
102
101
278
277
276
16
17
18
26.0
27.6
29.2
250
236
223
582
550
520
477
451
426
407
385
364
99.0
97.4
95.8
274
272
271
Over Limit 25°C
6500 W TVS @10/1000 µs
Waveform 5A RTCA/DO-160 using 6500 W TVS Diodes
20
22
24
32.4
35.5
38.9
202
183
167
471
426
389
386
349
319
330
298
272
92.6
89.5
86.1
268
264
261
26
28
30
42.1
45.5
48.4
154
143
135
359
333
315
294
273
258
251
233
220
82.9
79.5
76.6
258
254
252
33
36
40
53.3
58.1
64.5
123
111
101
287
259
235
235
212
193
201
181
164
71.7
66.9
60.5
247
242
43
45
48
69.4
72.7
77.4
93
89
85
217
207
198
178
170
162
152
145
139
55.6
52.3
47.6
Microsemi TVS Part Numbers
compliant to RTCA/DO-160
Standard Capacitance
• Surface Mount
PLAD6.5KP10A – 48A, CA
Over Limit
25°C
* Surge currents are reduced by clamping voltage (see Eq 1). In the table above, the first three column (VWM, VC, and IPP) are taken from the data sheet while the subsequent three
0
0
columns of 40/120 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since many
TVS devices require derating for higher temperatures.
www.Microsemi.com Data
Rev 1: 11/2013
Points for 28
Curves in Graph 15
Copyright © 2013 Microsemi Corp.
MicroNote 132
Aircraft Lightning Protection
Graph 16: RTCA/DO-160, Waveform 5A, Levels 2 through 4, 7500 W TVS Series
Waveform 5A RTCA/DO-160E
using 7500 W TVS Diodes
Data Points for Curves in Graph 16
7500 W TVS @10/1000 µs
VC
Conversion to 40/120 µs IP Values
Peak Surge Currents for the Red Curves*
IS Threat for Levels shown on graph
Threat Levels 2-4
IP 25 oC
6.4/69 µs
A
IP 70 oC
6.4/69 µs
A
IP 100 oC
6.4/69 µs
A
2
125V/125A
A
3
300V/300A
A
4
750V/750A
A
V
V
IPP 7500 W
10/1000 µs
A
10
11
12
17.0
18.2
19.9
441
412
377
1028
960
878
843
787
720
720
672
615
108
107
105
283
282
280
733
732
730
13
14
15
21.5
23.2
24.4
349
323
307
813
753
715
667
617
586
569
527
500
103
102
101
278
277
276
728
727
16
17
18
26.0
27.6
29.2
288
272
257
671
634
599
550
520
491
470
444
419
99.0
97.4
95.8
274
272
271
20
22
24
32.4
35.5
38.9
231
211
193
538
492
450
441
403
369
377
344
315
92.6
89.5
86.1
268
264
261
26
28
30
42.1
45.5
48.4
178
165
155
415
384
361
340
315
296
290
269
253
82.9
79.5
76.6
258
254
252
33
36
40
53.3
58.1
64.5
141
129
116
329
301
270
270
247
221
230
211
189
71.7
66.9
60.5
247
242
236
43
45
48
69.4
72.7
77.4
108
103
97
252
240
226
207
197
185
176
168
158
55.6
52.3
47.6
231
227
223
Microsemi TVS Part Numbers
compliant to RTCA/DO-160
Standard Capacitance
• Surface Mount
PLAD7.5KP10A – 48A, CA
Over Limit 25°C
VWM
Waveform 5A RTCA/DO-160 using 7500 W TVS Diodes
Graph 16
* Surge currents are reduced by clamping voltage (see Eq 1). In the table above, the first three column (VWM, VC, and IPP) are taken from the data sheet while the subsequent three
0
0
columns of 40/120 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since many
TVS devices require derating for higher temperatures.
www.Microsemi.com Rev 1: 11/2013
Data Points
29
for Curves in Graph 16
Copyright © 2013 Microsemi Corp.
MicroNote 132
Aircraft Lightning Protection
Graph 17: RTCA/DO-160, Waveform 5A, Levels 2 through 4, 15,000 W TVS Series
Waveform 5A RTCA/DO-160
using 15,000 W TVS Diodes
Data Points for Curves in Graph 17
15,000 W TVS @10/1000
µs
Conversion to 40/120 µs IP Values
Peak Surge Currents for the Red Curves*
IS Threat for Levels shown on graph
Threat Levels 3-5
IP 70 oC
40/120 µs
A
IP 100 oC
40/120 µs
A
3
300V/300A
A
4
750V/750A
A
5
1600V/1600A
A
7.0
9.0
10
12.0
15.4
17.0
1251
975
882
2915
2272
2055
2390
1863
1685
2040
1590
1438
288
285
283
738
735
733
1588
1585
1583
12
14
16
19.9
23.2
26.0
753
645
576
1754
1503
1342
1438
1232
1100
1228
1052
939
280
277
274
730
727
724
1580
18
22
26
29.2
35.5
42.1
516
423
357
1202
986
832
986
809
682
841
690
582
271
264
258
721
714
708
30
36
43
48.4
58.1
69.4
309
258
216
720
601
503
590
493
412
504
421
352
252
242
231
702
48
54
60
77.4
87.1
96.8
195
171
156
454
398
363
372
326
298
318
279
254
223
213
203
70
90
130
113
146
209
132
102
71
308
238
165
253
195
135
216
167
115
187
154
91
160
200
280
259
322
452
58
47
33
135
110
76.9
111
90.2
63.0
94.5
77.0
53.8
41
0
0
V
Over Limit 25°C
IP 25 oC
40/120 µs
A
VC
Over Limit 25°C
V
IPP 15,500 W
10/1000 µs
A
VWM
Graph 17
Waveform 5A RTCA/DO-160 using 15,000 W TVS Diodes
Microsemi TVS Part Numbers
compliant to RTCA/DO-160
Standard Capacitance
• Axial Lead
15KP22A – 280A, CA
• Surface Mount
PLAD15KP7.0A – 200A, CA
Add M prefix for the part numbers
shown to add source control or
MA, MX, or MXL for further upgrade
screening options on plastic devices
as described in Micronote 129.
* Surge currents are reduced by clamping voltage (see Eq 1). In the table above, the first three column (VWM, VC, and IPP) are taken from the data sheet while the subsequent three
0
0
columns of 40/120 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since many
TVS devices require derating for higher temperatures.
www.Microsemi.com Data
Rev 1: 11/2013
Points for30
Curves in Graph 17
Copyright © 2013 Microsemi Corp.
MicroNote 132
Aircraft Lightning Protection
Graph 18: RTCA/DO-160, Waveform 5A, Levels 3 through 5, 30,000 W TVS Series
Waveform 5A RTCA/DO-160
using 30,000 W TVS Diodes
Data Points for Curves in Graph 18
30,000 W TVS @10/1000 µs
Waveform 5A RTCA/DO-160 using 30,000 W TVS Diodes
Conversion to 40/120 µs IP Values
Peak Surge Currents for the Red Curves*
IS Threat for Levels shown on graph
Threat Levels 3-5
IP 70 oC
40/120 µs
A
IP 100 oC
40/120 µs
A
3
300V/300A
A
4
750V/750A
A
5
1600V/1600A
A
14
16
18
24.0
27.2
30.8
1251
1101
975
2915
2565
2272
2390
2103
1863
2040
1795
1590
276
273
269
726
723
719
1576
1573
1569
22
26
30
36.4
43.0
48.8
822
696
618
1915
1622
1440
1570
1330
1181
1379
1135
1008
264
257
251
714
707
701
1564
1557
36
43
48
58.1
69.4
77.4
516
432
390
1202
1007
909
986
826
745
841
705
636
242
231
223
692
681
673
54
60
70
87.1
96.8
113
342
312
264
797
727
615
654
596
504
558
509
430
213
203
187
663
653
78
90
110
126
146
177
240
204
168
559
475
391
458
390
320
391
332
274
174
154
123
130
160
180
209
259
291
142
116
104
331
270
242
271
221
198
232
189
169
91
41
9
220
300
400
356
483
644
84
62
46
196
144
107
161
118
88
137
101
74.9
0
Standard Capacitance
• Surface Mount
PLAD30KP14A – 400A, CA
Add M prefix for the part numbers
shown to add source control or
MA, MX, or MXL for further upgrade
screening options on plastic devices
as described in Micronote 129.
Over Limit 25°C
V
Over Limit 25°C
IP 25 oC
40/120 µs
A
VC
Graph 18
V
IPP 30,000 W
10/1000 µs
A
VWM
Microsemi TVS Part Numbers
compliant to RTCA/DO-160
* Surge currents are reduced by clamping voltage (see Eq 1). In the table above, the first three column (VWM, VC, and IPP) are taken from the data sheet while the subsequent three
0
0
columns of 40/120 µs data were derived as illustrated earlier in this document and also MicroNoteTM 127. The 70 C and 100 C curves were added for simplifying selection since many
TVS devices require derating for higher temperatures.
www.Microsemi.com Data Points
Rev 1: 11/2013
31
for Curves
in Graph 18
Copyright © 2013 Microsemi Corp.
For additional technical information,
please contact Design Support
at:
http://www.microsemi.com/designsupport
or
Kent Walters ([email protected]) at 602-458-3212
Power Matters.™
www.Microsemi.com Rev 1: 11/2013
Copyright © 2013 Microsemi Corp.