ETC BAW56WT1/D

ON Semiconductor
Dual Switching Diode
BAW56WT1
ON Semiconductor Preferred Device
MAXIMUM RATINGS (TA = 25°C)
Rating
Symbol
Max
Unit
Reverse Voltage
VR
70
Vdc
Forward Current
IF
200
mAdc
IFM(surge)
500
mAdc
Symbol
Max
Unit
PD
200
mW
1.6
mW/°C
RJA
0.625
°C/W
PD
300
mW
2.4
mW/°C
RJA
417
°C/W
TJ, Tstg
–55 to +150
°C
Peak Forward Surge Current
3
1
2
THERMAL CHARACTERISTICS
Characteristic
Total Device Dissipation FR–5
TA = 25°C
Derate above 25°C
Board(1)
Thermal Resistance, Junction to Ambient
Total Device Dissipation
Alumina Substrate(2) TA = 25°C
Derate above 25°C
Thermal Resistance, Junction to Ambient
Junction and Storage Temperature
CASE 419–04, STYLE 4
SC–70/SOT–323
CATHODE
1
3
ANODE
2
DEVICE MARKING
BAW56WT1 = A1
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted)
Characteristic
Symbol
Min
Max
Unit
V(BR)
70
—
Vdc
—
—
—
30
2.5
50
—
2.0
—
—
—
—
715
855
1000
1250
—
6.0
OFF CHARACTERISTICS
Reverse Breakdown Voltage
(I(BR) = 100 µAdc)
Reverse Voltage Leakage Current
(VR = 25 Vdc, TJ = 150°C)
(VR = 70 Vdc)
(VR = 70 Vdc, TJ = 150°C)
IR
Diode Capacitance
(VR = 0, f = 1.0 MHz)
CD
Forward Voltage
(IF = 1.0 mAdc)
(IF = 10 mAdc)
(IF = 60 mAdc)
(IF = 150 mAdc)
VF
Reverse Recovery Time
(IF = IR = 10 mAdc, RL = 100 Ω, IR(REC) = 1.0 mAdc) (Figure 1)
trr
µAdc
pF
mVdc
ns
1. FR–5 = 1.0 0.75 0.062 in.
2. Alumina = 0.4 0.3 0.024 in. 99.5% alumina.
Preferred devices are ON Semiconductor recommended choices for future use and best overall value.
 Semiconductor Components Industries, LLC, 2001
March, 2001 – Rev. 1
1
Publication Order Number:
BAW56WT1/D
BAW56WT1
820 Ω
+10 V
2.0 k
100 µH
IF
tp
tr
0.1 µF
IF
t
trr
10%
t
0.1 µF
90%
DUT
50 Ω OUTPUT
PULSE
GENERATOR
50 Ω INPUT
SAMPLING
OSCILLOSCOPE
IR
VR
INPUT SIGNAL
iR(REC) = 1.0 mA
OUTPUT PULSE
(IF = IR = 10 mA; MEASURED
at iR(REC) = 1.0 mA)
Notes: 1. A 2.0 kΩ variable resistor adjusted for a Forward Current (IF) of 10 mA.
Notes: 2. Input pulse is adjusted so IR(peak) is equal to 10 mA.
Notes: 3. tp » trr
Figure 1. Recovery Time Equivalent Test Circuit
10
IR , REVERSE CURRENT (µA)
10
TA = 85°C
TA = 25°C
1.0
TA = 150°C
TA = 125°C
1.0
TA = 85°C
0.1
TA = 55°C
0.01
TA = -40°C
0.1
0.2
0.4
0.6
0.8
1.0
VF, FORWARD VOLTAGE (VOLTS)
0.001
1.2
TA = 25°C
10
0
Figure 2. Forward Voltage
20
30
40
VR, REVERSE VOLTAGE (VOLTS)
Figure 3. Leakage Current
1.75
CD, DIODE CAPACITANCE (pF)
IF, FORWARD CURRENT (mA)
100
1.5
1.25
1.0
0.75
0
2
4
6
VR, REVERSE VOLTAGE (VOLTS)
Figure 4. Capacitance
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50
BAW56WT1
MINIMUM RECOMMENDED FOOTPRINT FOR SURFACE MOUNTED APPLICATIONS
Surface mount board layout is a critical portion of the total
design. The footprint for the semiconductor packages must
be the correct size to insure proper solder connection
interface between the board and the package. With the
correct pad geometry, the packages will self align when
subjected to a solder reflow process.
0.025
0.65
0.025
0.65
0.075
1.9
0.035
0.9
0.028
0.7
inches
mm
SC-70/SOT-323 POWER DISSIPATION
the equation for an ambient temperature TA of 25°C, one can
calculate the power dissipation of the device which in this
case
is
200
milliwatts.
The power dissipation of the SC-70/SOT-323 is a function
of the collector pad size. This can vary from the minimum
pad size for soldering to the pad size given for maximum
power dissipation. Power dissipation for a surface mount
device is determined by TJ(max), the maximum rated
junction temperature of the die, RθJA, the thermal resistance
from the device junction to ambient; and the operating
temperature, TA. Using the values provided on the data
sheet,
PD
can
be
calculated
as
follows.
PD =
PD =
150°C – 25°C
0.625°C/W
= 200 milliwatts
The 0.625°C/W assumes the use of the recommended
footprint on a glass epoxy printed circuit board to achieve a
power dissipation of 200 milliwatts. Another alternative
would be to use a ceramic substrate or an aluminum core
board such as Thermal Clad. Using a board material such
as Thermal Clad, a power dissipation of 300 milliwatts can
be achieved using the same footprint.
TJ(max) – TA
RθJA
The values for the equation are found in the maximum
ratings table on the data sheet. Substituting these values into
SOLDERING PRECAUTIONS
• The soldering temperature and time should not exceed
The melting temperature of solder is higher than the rated
temperature of the device. When the entire device is heated
to a high temperature, failure to complete soldering within
a short time could result in device failure. Therefore, the
following items should always be observed in order to
minimize the thermal stress to which the devices are
subjected.
• Always preheat the device.
• The delta temperature between the preheat and
soldering should be 100°C or less.*
• When preheating and soldering, the temperature of the
leads and the case must not exceed the maximum
temperature ratings as shown on the data sheet. When
using infrared heating with the reflow soldering
method, the difference should be a maximum of 10°C.
260°C for more than 10 seconds.
• When shifting from preheating to soldering, the
maximum temperature gradient should be 5°C or less.
• After soldering has been completed, the device should
be allowed to cool naturally for at least three minutes.
Gradual cooling should be used as the use of forced
cooling will increase the temperature gradient and
result in latent failure due to mechanical stress.
• Mechanical stress or shock should not be applied
during cooling
* Soldering a device without preheating can cause
excessive thermal shock and stress which can result in
damage to the device.
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BAW56WT1
SOLDER STENCIL GUIDELINES
or stainless steel with a typical thickness of 0.008 inches.
The stencil opening size for the surface mounted package
should be the same as the pad size on the printed circuit
board, i.e., a 1:1 registration.
Prior to placing surface mount components onto a printed
circuit board, solder paste must be applied to the pads. A
solder stencil is required to screen the optimum amount of
solder paste onto the footprint. The stencil is made of brass
TYPICAL SOLDER HEATING PROFILE
graph shows the actual temperature that might be
experienced on the surface of a test board at or near a central
solder joint. The two profiles are based on a high density and
a low density board. The Vitronics SMD310
convection/infrared reflow soldering system was used to
generate this profile. The type of solder used was 62/36/2
Tin Lead Silver with a melting point between 177–189°C.
When this type of furnace is used for solder reflow work, the
circuit boards and solder joints tend to heat first. The
components on the board are then heated by conduction. The
circuit board, because it has a large surface area, absorbs the
thermal energy more efficiently, then distributes this energy
to the components. Because of this effect, the main body of
a component may be up to 30 degrees cooler than the
adjacent solder joints.
For any given circuit board, there will be a group of
control settings that will give the desired heat pattern. The
operator must set temperatures for several heating zones,
and a figure for belt speed. Taken together, these control
settings make up a heating “profile” for that particular
circuit board. On machines controlled by a computer, the
computer remembers these profiles from one operating
session to the next. Figure 5 shows a typical heating profile
for use when soldering a surface mount device to a printed
circuit board. This profile will vary among soldering
systems but it is a good starting point. Factors that can affect
the profile include the type of soldering system in use,
density and types of components on the board, type of solder
used, and the type of board or substrate material being used.
This profile shows temperature versus time. The line on the
STEP 1
PREHEAT
ZONE 1
RAMP"
200°C
150°C
STEP 2
STEP 3
VENT
HEATING
SOAK" ZONES 2 & 5
RAMP"
DESIRED CURVE FOR HIGH
MASS ASSEMBLIES
STEP 5
STEP 4
HEATING
HEATING
ZONES 3 & 6 ZONES 4 & 7
SPIKE"
SOAK"
205° TO 219°C
PEAK AT
SOLDER JOINT
170°C
160°C
150°C
140°C
100°C
100°C
50°C
STEP 6 STEP 7
VENT COOLING
SOLDER IS LIQUID FOR
40 TO 80 SECONDS
(DEPENDING ON
MASS OF ASSEMBLY)
DESIRED CURVE FOR LOW
MASS ASSEMBLIES
TMAX
TIME (3 TO 7 MINUTES TOTAL)
Figure 5. Typical Solder Heating Profile
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BAW56WT1
PACKAGE DIMENSIONS
SC–70 (SOT–323)
CASE 419–04
ISSUE L
A
L
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3
B
S
1
2
D
G
C
0.05 (0.002)
J
N
K
H
STYLE 4:
PIN 1. CATHODE
2. CATHODE
3. ANODE
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DIM
A
B
C
D
G
H
J
K
L
N
S
INCHES
MIN
MAX
0.071
0.087
0.045
0.053
0.032
0.040
0.012
0.016
0.047
0.055
0.000
0.004
0.004
0.010
0.017 REF
0.026 BSC
0.028 REF
0.079
0.095
MILLIMETERS
MIN
MAX
1.80
2.20
1.15
1.35
0.80
1.00
0.30
0.40
1.20
1.40
0.00
0.10
0.10
0.25
0.425 REF
0.650 BSC
0.700 REF
2.00
2.40
BAW56WT1
Notes
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BAW56WT1
Notes
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BAW56WT1
Thermal Clad is a trademark of the Bergquist Company
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or
death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold
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attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim
alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
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BAW56WT1/D