Varistor Products
Surface Mount Multilayer Varistors (MLVs) > MLA Series
RoHS
MLA Varistor Series
Description
The wide operating voltage and energy range make the
MLA Series suitable for numerous applications on power
supply, control and signal lines.
Size Table
Metric
EIA
1005
0402
1608
2012
0805
1206
1210
The MLA Series is manufactured from semiconducting
ceramics, and is supplied in a leadless, surface mount
package. The MLA Series is compatible with modern
reflow and wave soldering procedures.
It can operate over a wider temperature range than Zener
diodes, and has a much smaller footprint than plastichoused components.
Applications
t 4VQQSFTTJPOPGJOEVDUJWF
switching or other
transient events such as
EFT and surge voltage at
the circuit board level
t &4%QSPUFDUJPOGPS*&$
61000-4-2, MIL-STDDNFUIPE
and other industry
specifications (see also
the MLE or MLN Series)
t 6TFEUPIFMQBDIJFWF
electromagnetic
compliance of
end products
t 3FQMBDFMBSHFSTVSGBDF
mount TVS Zeners in
many applications
Littelfuse Inc. manufactures other multilayer series
products. See the MLE Series data sheet for ESD
applications, MHS Series data sheet for high-speed ESD
applications, the MLN Series for multiline protection and
the AUML Series for automotive applications.
Features
t "&$2DPNQMJBOU
t RoHS compliant
t -FBEMFTT
0805, 1206 and
1210 chip sizes
t .VMUJMBZFSDFSBNJD
construction technology
t 1SPWJEFTPOCPBSE
transient voltage
protection for ICS
and transistors
t ¡$UP¡$
operating temp. range
t 0QFSBUJOHWPMUBHFSBOHF
VM(DC) = 5.5V to 120V
t 3BUFEGPSTVSHF
current (8 x 20μs)
t 3BUFEGPSFOFSHZ
(10 x 1000μs)
t *OIFSFOUCJEJSFDUJPOBM
clamping
t /PQMBTUJDPSFQPYZ
packaging assures
better than UL94V-0
flammability rating
t 4UBOEBSEMPXDBQBDJUBODF
types available
Absolute Maximum Ratings
For ratings of individual members of a series, see device ratings and specifications table.
Continuous
Steady State Applied Voltage:
DC Voltage Range (VM(DC))
AC Voltage Range (VM(AC)RMS)
Transient:
Non-Repetitive Surge Current, 8/20μs Waveform, (ITM)
Non-Repetitive Surge Energy, 10/1000μs Waveform, (WTM)
0QFSBUJOH"NCJFOU5FNQFSBUVSF3BOHF5A)
Storage Temperature Range (TSTG)
Temperature Coefficient (DV) of Clamping Voltage (VC) at
Specified Test Current
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ML.html of MLA.html for current information.
ML Series
Units
UP
UP
V
V
4 to 500
0.02 to 2.5
UP
UP
A
J
ºC
ºC
<0.01
%/º C
MLA Varistor Series
Revision: November 10, 2010
MLA Series
The MLA Series (also known as "ML" series) family of
transient voltage surge suppression devices is based on
the Littelfuse Multilayer fabrication technology. These
components are designed to suppress a variety of
transient events, including those specified in IEC 61000-4-2
or other standards used for Electromagnetic Compliance
(EMC). The MLA Series is typically applied to protect
integrated circuits and other components at the circuit
board level.
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > MLA Series
Device Ratings and Specifications
Part Number
7.-"/5
7.-"/
7.-"-/
7.-"/
V5.5MLA0402N
V5.5MLA0402LN
7.-"/5
7.-"-/4
V5.5MLA0805N
V5.5MLA0805LN
V5.5MLA1206N
V9MLA0402N
V9MLA0402LN
7.-"/5
7.-"-/4
V9MLA0805LN
V12MLA0805LN
V14MLA0402N
7.-"/
V14MLA0805N
V14MLA0805LN
V14MLA1206N
V18MLA0402N
7.-"/
V18MLA0805N
V18MLA0805LN
V18MLA1206N
V18MLA1210N
7.-"/
V26MLA0805N
V26MLA0805LN
V26MLA1206N
V26MLA1210N
7.-"/
7.-"-/
7.-"/
7.-"-/
7.-"/
V42MLA1206N
V48MLA1206N
V48MLA1210N
V48MLA1210LN
V56MLA1206N
V60MLA1210N
V68MLA1206N
V85MLA1210N
V120MLA1210N
Maximum Ratings (125º C)
Specifications (25ºC)
Maximum
Maximum Non- Maximum Non- Maximum Clamping Nominal Voltage
Typical
Continuous
repetitive Surge repetitive Surge Voltage at 1A (or as at 1mA DC Test Capacitance
Working Voltage Current (8/20μs) Energy (10/1000μs)
Noted) (8/20μs)
Current
at f = 1MHz
VN(DC)
VN(DC)
VM(DC)
VM(AC)
ITM
WTM
VC
C
Min
Max
(V)
(V)
(A)
(J)
(V)
(V)
(V)
(pF)
2.5
0.100
2.5
120
2.5
40
0.100
2.5
100
6000
5.5
4.0
20
0.050
21.0
10.8
220
5.5
4.0
20
0.050
15.9
21.5
5.5
4.0
0.100
500
5.5
4.0
0.100
450
5.5
4.0
120
1840
5.5
4.0
40
0.100
400
5.5
4.0
150
0.400
9.0
6.5
20
0.050
11.0
16.0
120
9.0
6.5
4
0.020
11.0
16.0
9.0
6.5
0.100
25.5
11.0
16.0
490
9.0
6.5
0.100
25.5
11.0
16.0
9.0
6.5
40
0.100
25.5
11.0
16.0
520
12.0
9.0
40
0.100
29.0
14.0
18.5
410
14.0
10.0
20
0.050
15.9
21.5
14.0
10.0
0.100
15.9
21.5
180
14.0
10.0
120
15.9
560
14.0
10.0
40
0.100
15.9
14.0
10.0
150
0.400
15.9
1400
18.0
14.0
20
0.050
50.0
22.0
28.0
40
18.0
14.0
0.100
50.0
22.0
28.0
120
18.0
14.0
120
44.0
22.0
28.0
520
18.0
14.0
40
0.100
44.0
22.0
28.0
290
18.0
14.0
150
0.400
44.0
22.0
28.0
18.0
14.0
500
2.500
44.0 at 2.5
22.0
28.0
1440
26.0
20.0
0.100
60.0
110
26.0
20.0
100
60.0
29.5
220
26.0
20.0
40
0.100
60.0
29.5
140
26.0
20.0
150
0.600
60.0
29.5
600
26.0
20.0
1.200
60.0 at 2.5
29.5
1040
25.0
0.100
46.0
90
25.0
0.100
46.0
90
25.0
280
1.200
68.0 at 2.5
1820
25.0
220
0.900
68.0 at 2.5
26.0
180
0.800
49.0
500
42.0
180
0.800
92.0
46.0
60.0
425
48.0
40.0
180
0.900
100
54.5
66.5
48.0
40.0
250
1.200
105.0 at 2.5
54.5
66.5
520
48.0
40.0
220
0.900
105.0 at 2.5
54.5
66.5
500
56.0
40.0
180
1.000
120.0
61.0
180
60.0
50.0
250
1.500
BU
440
68.0
50.0
180
1.000
140.0
90.0
100
85.0
250
2.500
180.0 at 2.5
95.0
115.0
260
120.0
125
2.000
260.0 at 2.5
165.0
80
/05&4
1 'L' suffix is a low capacitance and energy version; Contact your Littelfuse sales representative for custom capacitance requirements
2 Typical leakage at 25ºC<25μA, maximum leakage 100μA at VM(DC); for 0402 size, typical leakage <5μA, maximum leakage <20μA at VM(DC)
"WFSBHFQPXFSEJTTJQBUJPOPGUSBOTJFOUTGPSBOETJ[FTOPUUPFYDFFE8888BOE8SFTQFDUJWFMZ
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*UFNJTBWBJMBCMFJOh)hh5hBOEh"hQBDLJOHPQUJPOPOMZ"MMBOEQBSUTDPNFBTh)hh5hBOEh"hQBDLJOHPQUJPOPOMZ4FF1BDLBHJOHTFDUJPOGPSBEEJUJPOBMJOGPSNBUJPO
MLA Varistor Series
Revision: November 10, 2010
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ML.html or MLA.html for current information.
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > MLA Series
Peak Current and Energy Derating Curve
Peak Pulse Current Test Waveform for Clamping Voltage
100
PERCENT OF PEAK VALUE
When transients occur in rapid succession, the average
power dissipation is the energy (watt-seconds) per pulse
times the number of pulses per second. The power so
developed must be within the specifications shown
on the Device Ratings and Specifications Table for the
TQFDJmDEFWJDF'PSBQQMJDBUJPOTFYDFFEJOH¡$BNCJFOU
temperature, the peak surge current and energy ratings
must be derated as shown below.
50
0
T
PERCENT OF RATED VALUE
O1
TIME
T1
Figure 2
80
017JSUVBM0SJHJOPG8BWF
55JNFGSPNUPPG1FBL
T1 = Rise Time = 1.25 x T
T2 = Decay Time
Example - For an 8/20 μT$VSSFOU8BWFGPSN
8μs = T1 = Rise Time
20μs = T2 = Decay Time
60
40
20
0
-55
50
60
70
80
90
100
110
120
130 140 150
AMBIENT TEMPERATURE ( oC)
Figure 1
Limit V-I Characteristic for V5.5MLA0402 to V18MLA0402
Limit V-I Characteristic for V9MLA0402L
100
10
Varistor Voltage (V)
Varistor Voltage (V)
100
V18MLA0402
V14MLA0402
V9MLA0402
V5.5MLA0402
1
1μA
T2
MLA Series
100
10μA
100μA
1mA
10mA
1A
10A
Figure 3
V9MLA0402L
V5.5MLA0402L
1
1μA
100A
Current (A)
10
10μA
100μA
Figure 4
Limit V-I Characteristic for V3.5MLA0603 to V30MLA0603
1mA
10mA
1A
10A
100A
Current (A)
Limit V-I Characteristic for V3.5MLA0805L to V30MLA0805L
1000
1000
V30MLA0805L
V26MLA0805L
V30MLA0603
V18MLA0805L
V26MLA0603
Varistor Voltage (V)
V18MLA0603
100
Varistor Voltage (V)
V14MLA0603
10
V9MLA0603, V9MLA0603L
100
V14MLA0805L
10
V12MLA0805L
V9MLA0805L
V5.5MLA0603, V5.5MLA0603L
V5.5MLA0805L
V3.5MLA0603
V3.5MLA0805L
1
10μA
Figure 5
1
10μA
100μA
1mA
10mA
Current (A)
100mA
1A
10A
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ML.html of MLA.html for current information.
100A
Figure 6
100μA
1mA
10mA
100mA
1A
10A
100A
Current (A)
MLA Varistor Series
Revision: November 10, 2010
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > MLA Series
Limit V-I Characteristic for V3.5MLA0805 to V26MLA0805
Limit V-I Characteristic for V3.5MLA1206 to V68MLA1206
1000
100
Varistor Voltage (V)
Varistor Voltage (V)
1000
V26MLA0805
10
V18MLA0805
100
V68MLA1206
V56MLA1206
V42MLA1206
V33MLA1206
V26MLA1206
V18MLA1206
V14MLA1206
V5.5MLA1206
V3.5MLA1206
10
V14MLA0805
V5.5MLA0805
V3.5MLA0805
1
10μA
100μA
1mA
10mA
100mA
1A
10A
100A
1000A
Current (A)
Figure 7
1
10μA
100μA
1mA
10mA
100mA
Current (A)
1A
10A
100A
1000A
Figure 8
Limit V-I Characteristic for V18MLA1210 to V120MLA1210
1000
MAXIMUM CLAMPING VOLTAGE
MAXIMUM LEAKAGE
Varistor Voltage (V)
100
V120MLA1210
10
V85MLA1210
V60MLA1210
V48MLA1210, V48MLA1210L
V30MLA1210, V30MLA1210L
V26MLA1210
1
10μA
V18MLA1210
100μA
Figure 9
1mA
10mA
100mA
1A
10A
100A
1000A
CURRENT (A)
MLA Varistor Series
Revision: November 10, 2010
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ML.html or MLA.html for current information.
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > MLA Series
Clamping Voltage Over Temperature (VC at 10A)
At low current levels, the V-I curve of the multilayer
transient voltage suppressor approaches a linear (ohmic)
relationship and shows a temperature dependent effect.
At or below the maximum working voltage, the suppressor
is in a high resistance modex (approaching 106Ω at its
maximum rated working voltage). Leakage currents at
maximum rated voltage are below 100μA, typically 25μA;
for 0402 size below 20μA, typically 5μA.
CLAMPING VOLTAGE (V)
100
V26MLA1206
V5.5MLA1206
Typical Temperature Dependance of the Haracteristic
Curve in the Leakage Region
10
-60
-40
Figure 11
VNOM VALUE AT 25 oC (%)
SUPPRESSOR VOLTAGE IN PERCENT OF
100%
-20
0
20
40
60
80
TEMPERATURE ( oC)
100
120
140
Energy Absorption/Peak Current Capability
25
10%
1E -9
o
50o 75o
1E -8
100o 125 oC
1E -7
Figure 10
1E -6
1E -5
1E -4
1E -3
1E -2
SUPPRESSOR CURRENT (ADC)
Speed of Response
The Multilayer Suppressor is a leadless device. Its
response time is not limited by the parasitic lead
inductances found in other surface mount packages.
The response time of the ZN0EJFMFDUSJDNBUFSJBMJTMFTT
than 1ns and the MLA can clamp very fast dV/dT events
such as ESD. Additionally, in "real world" applications,
the associated circuit wiring is often the greatest
factor effecting speed of response. Therefore, transient
suppressor placement within a circuit can be considered
important in certain instances.
Energy dissipated within the MLA Series is calculated
by multiplying the clamping voltage, transient current
and transient duration. An important advantage of the
multilayer is its interdigitated electrode construction within
the mass of dielectric material. This results in excellent
current distribution and the peak temperature per energy
absorbed is very low. The matrix of semiconducting grains
combine to absorb and distribute transient energy (heat)
(see Speed of Response). This dramatically reduces peak
temperature; thermal stresses and enhances device
reliability.
As a measure of the device capability in energy and peak
current handling, the V26MLA1206A part was tested with
multiple pulses at its peak current rating (150A, 8/20μs). At
the end of the test,10,000 pulses later, the device voltage
characteristics are still well within specification.
3FQFUJUJWF1VMTF$BQBCJMJUZ
Multilayer Internal Construction
100
PEAK CURRENT = 150A
8/20 s DURATION, 30s BETWEEN PULSES
FIRED CERAMIC
DIELECTRIC
VOLTAGE
V26MLA1206
METAL
ELECTRODES
METAL END
TERMINATION
10
DEPLETION
0
REGION
Figure 13
2000
4000
6000
8000
10000
12000
NUMBER OF PULSES
DEPLETION
REGION
Figure 12
GRAINS
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ML.html of MLA.html for current information.
MLA Varistor Series
Revision: November 10, 2010
MLA Series
Device Characteristics
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > MLA Series
Lead (Pb) Soldering Recommendations
The principal techniques used for the soldering of
components in surface mount technology are IR Re-flow
and Wave soldering. Typical profiles are shown on the right.
Reflow Solder Profile
250
The recommended solder for the MLA suppressor is
B4O1C"H
4O1C
PS4O1C
Littelfuse also recommends an RMA solder flux.
MAXIMUM TEMPERATURE
230°C
When using a reflow process, care should be taken to
ensure that the MLA chip is not subjected to a thermal
gradient steeper than 4 degrees per second; the ideal
gradient being 2 degrees per second. During the soldering
process, preheating to within 100 degrees of the solder's
peak temperature is essential to minimize thermal shock.
0ODFUIFTPMEFSJOHQSPDFTTIBTCFFODPNQMFUFEJUJT
still necessary to ensure that any further thermal shocks
BSFBWPJEFE0OFQPTTJCMFDBVTFPGUIFSNBMTIPDLJTIPU
printed circuit boards being removed from the solder
process and subjected to cleaning solvents at room
temperature. The boards must be allowed to cool gradually
to less than 50º C before cleaning.
40-80
SECONDS
ABOVE 183°C
150
RAMP RATE
<2°C/s
100
PREHEAT DWELL
50
PREHEAT ZONE
0
Figure 14
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
TIME (MINUTES)
Wave Solder Profile
300
MAXIMUM WAVE 260°C
250
TEMPERATURE °C
Wave soldering is the most strenuous of the processes.
To avoid the possibility of generating stresses due to
thermal shock, a preheat stage in the soldering process
is recommended, and the peak temperature of the solder
process should be rigidly controlled.
TEMPERATURE °C
200
200
150
SECOND PREHEAT
100
FIRST PREHEAT
50
0
0.0
0.5
1.0
1.5
Figure 15
2.0
2.5
3.0
TIME (MINUTES)
3.5
4.0
4.5
Lead–free (Pb-free) Soldering Recommendations
Littelfuse offers the Nickel Barrier Termination option (see
/TVGmYJO1BSU/VNCFSJOH4ZTUFNGPSPSEFSJOH
GPSUIF
optimum Lead–free solder performance, consisting of a
Matte Tin outer surface plated on Nickel underlayer, plated
on Silver base metal.
Lead–free Re-flow Solder Profile
300
MAXIMUM TEMPERATURE 260˚C,
TIME WITHIN 5˚C OF PEAK
20 SECONDS MAXIMUM
The reflow profile must be constrained by the maximums
JOUIF-FBEoGSFF3FnPX1SPmMF'PS-FBEoGSFFXBWF
TPMEFSJOHUIF8BWF4PMEFS1SPmMFTUJMMBQQMJFT
/PUFUIF-FBEoGSFFQBTUFnVYBOEQSPmMFXFSFVTFEGPS
evaluation purposes by Littelfuse, based upon industry
standards and practices. There are multiple choices of all
three available, it is advised that the customer explores the
optimum combination for their process as processes vary
considerably from site to site.
TEMPERATURE °C
250
5IFQSFGFSSFETPMEFSJT4O"H$V
XJUIBO3."
flux, but there is a wide selection of pastes and fluxes
available with which the Nickel Barrier parts should be
compatible.
RAMP RATE
<3˚C/s
200
60 - 150 SEC
> 217˚C
150
100
PREHEAT ZONE
50
0
Figure 16
MLA Varistor Series
Revision: November 10, 2010
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
TIME (MINUTES)
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ML.html or MLA.html for current information.
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > MLA Series
Product Dimensions (mm)
1"%-":065%*.&/4*0/4
$)*1-":065%*.&/4*0/4
C
E
B
NOTE
D
L
W
A
1210 Size
Dimension
1206 Size
IN
MM
IN
MM
A
0.160
B
0.100
4.06
0.160
2.54
0.065
C
0.040
1.02
0.040
0805 Size
0603 Size
IN
MM
4.06
0.120
1.65
0.050
1.02
0.040
0402 Size
IN
MM
IN
MM
0.100
2.54
0.020
0.51
1.02
0.89
0.024
0.61
D (max.)
1.80
1.10
0.040
1.00
0.024
0.60
E
0.020
0.50
0.020
0.50
0.010
0.25
0.015
0.4
0.010
0.25
L
0.125
0.125
2.01
1.6
1.00
W
0.100
2.54
0.060
1.60
0.049
1.25
0.8
0.020
0.50
Part Numbering System
V 18 MLA 1206 X X X
PACKING OPTIONS (see Packaging table for quantities)
T: 13in (330mm) Diameter Reel, Plastic Carrier Tape
H: 7in (178mm) Diameter Reel, Plastic Carrier Tape
R: 7in (178mm) Diameter Reel, Paper Carrier Tape
A: Bulk Pack
DEVICE FAMILY
Littelfuse TVSS Device
MAXIMUM DC
WORKING VOLTAGE
END TERMINATION OPTION
No Letter: Standard
N: Nickel Barrier Option
(Matte Tin outer surface, plated on Nickel underlayer
plated on silver base metal)
CAPACITANCE OPTION
No Letter: Standard
L: Low Capacitance Version
MULTILAYER SERIES
DESIGNATOR
DEVICE SIZE:
0201 = .024 inch x .012 inch (0.6 mm x 0.3 mm)
0402 = .04 inch x .02 inch (1.0 mm x 0.5 mm)
0603 = .063 inch x .031 inch (1.6 mm x 0.8 mm)
0805 = .08 inch x .08 inch (2.0 mm x 1.25 mm)
1206 = .126 inch x .063 inch (3.2 mm x 1.6 mm)
1210 = .126 inch x .1 inch (3.2 mm x 2.5 mm)
/05&4
1 V120MLA1210 standard shipping quantities are 1000 pieces per reel for the "H" option and 4000 pieces per reel for "T" option.
7.-"7.-"BOE7.-"POMZBWBJMBCMFJO)5BOE"QBDLJOHPQUJPOT
Packaging*
Quantity
Device Size
13” Inch Reel
("T" Option)
7” Inch Reel
("H" Option)
7” Inch Reel
("R" Option)
Bulk Pack
("A" Option)
1210
1206
0805
0402
8,000
10,000
10,000
10,000
N/A
2,000
2,500
2,500
2,500
N/A
N/A
N/A
N/A
4,000
10,000
2,000
2,500
2,500
2,500
N/A
1BDLBHJOH
*UJTSFDPNNFOEFEUIBUQBSUTCFLFQUJOUIFTFBMFECBHQSPWJEFEBOEUIBUQBSUTCFVTFEBTTPPOBTQPTTJCMFXIFOSFNPWFEGSPNCBHT
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ML.html of MLA.html for current information.
MLA Varistor Series
Revision: November 10, 2010
MLA Series
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Silver (Ag) epoxy paste.
Varistor Products
Surface Mount Multilayer Varistors (MLVs) > MLA Series
Tape and Reel Specifications
D0
PRODUCT
IDENTIFYING
LABEL
P0
For T and H Pack Options: PLASTIC CARRIER TAPE
For R Pack Options: EMBOSSED PAPER CARRIER TAPE
P2
E
F
K0
W
B0
t1
D1
P1
Symbol
EMBOSSMENT
TOP TAPE
A0
8mm
NOMINAL
178mm
OR 330mm
DIA. REEL
Dimensions in Millimeters
Description
0402 Size
0603, 0805, 1206 & 1210 Sizes
A0
Width of Cavity
Dependent on Chip Size to Minimize Rotation.
B0
Length of Cavity
Dependent on Chip Size to Minimize Rotation.
Dependent on Chip Size to Minimize Rotation.
K0
Depth of Cavity
W
Width of Tape
F
Distance Between Drive Hole Centers and Cavity Centers
E
Distance Between Drive Hole Centers and Tape Edge
P1
Distance Between Cavity Centers
P2
Axial Drive Distance Between Drive Hole Centers & Cavity Centers
P0
Axial Drive Distance Between Drive Hole Centers
D0
Drive Hole Diameter
D1
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T1
Top Tape Thickness
N/A
0.1 Max
0.1 Max
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MLA Varistor Series
Revision: November 10, 2010
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ML.html or MLA.html for current information.