Surface Mount Varistors
Multilayer Transient Voltage Surge Suppressors
ML Varistor Series
The 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 ML Series is typically applied to protect integrated circuits and other components at the circuit board level.
The wide operating voltage and energy range make the ML Series suitable for numerous applications on power supply, control and signal lines.
The ML Series is manufactured from semiconducting ceramics, and is supplied in a leadless, surface mount package. The ML 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 plastic-housed components.
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 for multiline protection and the AUML Series for automotive applications.
Features
•Leadless 0402, 0603, 0805, 1206 and 1210 Chip Sizes
•Multilayer Ceramic Construction Technology
•-55oC to +125oC Operating Temperature Range
•Operating Voltage Range VM(DC) = 5.5V to 120V
•Rated for Surge Current (8 x 20µs)
•Rated for Energy (10 x 1000µs)
•Inherent Bi-directional Clamping
•No Plastic or Epoxy Packaging Assures Better than 94V-0 Flammability Rating
•Standard Low Capacitance Types Available
Applications
•Suppression of Inductive Switching or Other Transient Events Such as EFT and Surge Voltage at the Circuit Board Level
•ESD Protection for Components Sensitive to IEC 61000-4-2, MIL-STD-883C Method 3015.7, and Other Industry Specifications (See Also the MLE or MLN Series)
•Provides On-Board Transient Voltage Protection for ICs and Transistors
•Used to Help Achieve Electromagnetic Compliance of End Products
•Replace Larger Surface Mount TVS Zeners in Many Applications
140
w w w . l i t t e l f u s e . c o m
Surface Mount Varistors
Multilayer Transient Voltage Surge Suppressors
ML Varistor Series
Absolute Maximum Ratings For ratings of individual members of a series, see Device Ratings and Specifications table. |
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Continuous: |
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ML SERIES |
UNITS |
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Steady State Applied Voltage: |
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DC Voltage Range (VM(DC)). . . |
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. . 3.5 to 120 |
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AC Voltage Range (VM(AC)RMS) . . . . |
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. . 2.5 to 107 |
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Transient: |
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Non-Repetitive Surge Current, 8/20µs Waveform, (ITM) . . . . . . |
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. . . 4 to 500 |
A |
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Non-Repetitive Surge Energy, 10/1000µs Waveform, (WTM) . . |
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. . . 0.2 to 2.5 |
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Operating Ambient Temperature Range (T |
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. . -55 to + 125 |
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Storage Temperature Range (T |
STG |
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. . -55 to + 150 |
OC |
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Temperature Coefficient (αV) of Clamping Voltage (VC) at Specified Test Current |
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<0.01. . . . |
%/OC |
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Device Ratings and Specifications |
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MAXIMUM RATINGS (125 oC) |
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SPECIFICATIONS (25oC) |
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MAXIMUM |
MAXIMUM |
MAXIMUM |
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NON- |
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CLAMPING |
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MAXIMUM |
REPETITIVE |
REPETITIVE |
VOLTAGE AT |
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CONTINUOUS |
SURGE |
SURGE |
10A |
NOMINAL VOLTAGE |
TYPICAL |
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WORKING |
CURRENT |
ENERGY |
(OR AS NOTED) |
AT 1mA DC TEST |
CAPACITANCE |
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VOLTAGE |
(8/20 s) |
(10/1000 s) |
(8/20 s) |
CURRENT |
AT f = 1MHz |
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VN(DC) |
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VN(DC) |
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PART |
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VM(DC) |
VM(AC) |
ITM |
WTM |
VC |
MIN |
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MAX |
C |
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(V) |
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(V) |
(A) |
(J) |
(V) |
(V) |
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(V) |
(pF) |
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NUMBER |
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V3.5MLA0603 |
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3.5 |
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2.5 |
30 |
0.1 |
10 at 2A |
3.7 |
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7.0 |
1100 |
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V3.5MLA0805 |
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3.5 |
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2.5 |
120 |
0.3 |
10 at 5A |
3.7 |
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7.0 |
2200 |
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V3.5MLA0805L |
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3.5 |
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2.5 |
40 |
0.1 |
10 at 2A |
3.7 |
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7.0 |
1200 |
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V3.5MLA1206 |
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3.5 |
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2.5 |
100 |
0.3 |
14 |
3.7 |
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7.0 |
6000 |
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V5.5MLA0402 |
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5.5 |
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4.0 |
20 |
0.050 |
15.5 at 1A |
7.1 |
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9.3 |
220 |
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NEW |
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V5.5MLA0603 |
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5.5 |
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4.0 |
30 |
0.1 |
15.5 at 2A |
7.1 |
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9.3 |
660 |
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V5.5MLA0805 |
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5.5 |
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4.0 |
120 |
0.3 |
15.5 at 5A |
7.1 |
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9.3 |
1600 |
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V5.5MLA0805L |
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5.5 |
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4.0 |
40 |
0.1 |
15.5 at 2A |
7.1 |
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9.3 |
860 |
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V5.5MLA1206 |
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5.5 |
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4.0 |
150 |
0.4 |
15.5 |
7.1 |
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9.3 |
4500 |
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V9MLA0402 |
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6.5 |
20 |
0.050 |
22 at 1A |
11 |
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14 |
120 |
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NEW |
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V9MLA0402L |
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6.5 |
4 |
0.020 |
25 at 1A |
11 |
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14 |
33 |
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V9MLA0603 |
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9.0 |
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6.5 |
30 |
0.1 |
23 at 2A |
11.0 |
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16.0 |
420 |
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V9MLA0805L |
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9.0 |
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6.5 |
40 |
0.1 |
20 at 2A |
11 |
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14 |
450 |
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V12MLA0805L |
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9.0 |
40 |
0.1 |
25 at 2A |
14 |
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18.5 |
350 |
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V14MLA0402 |
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14 |
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10 |
20 |
0.050 |
30 at 1A |
15.9 |
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20.3 |
70 |
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NEW |
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V14MLA0603 |
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14 |
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10 |
30 |
0.1 |
30 at 2A |
15.9 |
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20.3 |
150 |
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V14MLA0805 |
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14 |
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10 |
120 |
0.3 |
30 at 5A |
15.9 |
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20.3 |
480 |
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V14MLA0805L |
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14 |
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10 |
40 |
0.1 |
30 at 2A |
15.9 |
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20.3 |
270 |
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V14MLA1206 |
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14 |
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10 |
150 |
0.4 |
30 |
15.9 |
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20.3 |
1600 |
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3
SURFACE MOUNTVARISTORS
141
w w w . l i t t e l f u s e . c o m
Surface Mount Varistors
Multilayer Transient Voltage Surge Suppressors
ML Varistor Series
Device Ratings and Specifications (Continued)
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MAXIMUM RATINGS (125 oC) |
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SPECIFICATIONS (25oC) |
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MAXIMUM |
MAXIMUM |
MAXIMUM |
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NON- |
NON- |
CLAMPING |
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MAXIMUM |
REPETITIVE |
REPETITIVE |
VOLTAGE AT |
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CONTINUOUS |
SURGE |
SURGE |
10A |
NOMINAL VOLTAGE |
TYPICAL |
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WORKING |
CURRENT |
ENERGY |
(OR AS NOTED) |
AT 1mA DC TEST |
CAPACITANCE |
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VOLTAGE |
(8/20 s) |
(10/1000 s) |
(8/20 s) |
CURRENT |
AT f = 1MHz |
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VN(DC) |
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VN(DC) |
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PART |
VM(DC) |
VM(AC) |
ITM |
WTM |
VC |
MIN |
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MAX |
C |
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NUMBER |
(V) |
(V) |
(A) |
(J) |
(V) |
(V) |
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(V) |
(pF) |
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V18MLA0402 |
18 |
14 |
20 |
0.050 |
40 at 1A |
22 |
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28.0 |
40 |
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V18MLA0603 |
18 |
14 |
30 |
0.1 |
40 at 2A |
22 |
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28.0 |
125 |
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V18MLA0805 |
18 |
14 |
120 |
0.3 |
40 at 5A |
22 |
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28.0 |
450 |
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V18MLA0805L |
18 |
14 |
40 |
0.1 |
40 at 2A |
22 |
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28.0 |
250 |
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V18MLA1206 |
18 |
14 |
150 |
0.4 |
40 |
22 |
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28.0 |
1100 |
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V18MLA1210 |
18 |
14 |
500 |
2.5 |
40 |
22 |
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28.0 |
1250 |
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V26MLA0603 |
26 |
20 |
30 |
0.1 |
58 at 2A |
31 |
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38 |
90 |
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V26MLA0805 |
26 |
20 |
100 |
0.3 |
58 at 5A |
29.5 |
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38.5 |
190 |
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V26MLA0805L |
26 |
20 |
40 |
0.1 |
58 at 2A |
29.5 |
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38.5 |
115 |
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V26MLA1206 |
26 |
20 |
150 |
0.6 |
56 |
29.5 |
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38.5 |
900 |
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V26MLA1210 |
26 |
20 |
300 |
1.2 |
54 |
29.5 |
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38.5 |
1000 |
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V30MLA0603 |
30 |
25 |
30 |
0.1 |
65 at 2A |
37 |
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46 |
75 |
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V30MLA0805L |
30 |
25 |
30 |
0.1 |
65 at 2A |
37 |
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46 |
80 |
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V30MLA1210 |
30 |
25 |
280 |
1.2 |
62 |
35 |
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43 |
1575 |
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V30MLA1210L |
30 |
25 |
220 |
0.9 |
62 |
35 |
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43 |
1530 |
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V33MLA1206 |
33 |
26 |
180 |
0.8 |
72 |
38 |
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49 |
550 |
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V42MLA1206 |
42 |
30 |
180 |
0.8 |
86 |
46 |
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60 |
550 |
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V48MLA1210 |
48 |
40 |
250 |
1.2 |
100 |
54.5 |
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66.5 |
450 |
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V48MLA1210L |
48 |
40 |
220 |
0.9 |
100 |
54.5 |
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66.5 |
430 |
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V56MLA1206 |
56 |
40 |
180 |
1.0 |
110 |
61 |
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77 |
150 |
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V60MLA1210 |
60 |
50 |
250 |
1.5 |
120 |
67 |
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83 |
375 |
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V68MLA1206 |
68 |
50 |
180 |
1.0 |
130 |
76 |
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90 |
150 |
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V85MLA1210 |
85 |
67 |
250 |
2.5 |
160 |
95 |
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115 |
225 |
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V120MLA1210 |
120 |
107 |
125 |
2.0 |
230 |
135 |
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165 |
65 |
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NOTES:
1.L suffix is a low capacitance and energy version; Contact your Littelfuse Sales Representative for custom capacitance requirements.
2.Typical leakage at 25oC<25 A, maximum leakage 50 A at VM(DC); for 0402 size, typical leakage <5 A, maximum leakage 10 A at VM(DC).
3.Average power dissipation of transients for 0402, 0603, 0805, 1206 and 1210 sizes not to exceed 0.03W, 0.05W, 0.1W, 0.1W and 0.15W respectively.
142
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Surface Mount Varistors
Multilayer Transient Voltage Surge Suppressors
ML Varistor Series
Temperature De-rating
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 specific device. For applications exceeding 125oC ambient temperature, the peak surge current and energy ratings must be derated as shown in Figure 1.
VALUE |
100 |
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RATED |
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80 |
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OF |
60 |
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PERCENT |
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40 |
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20 |
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0 |
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-55 |
50 |
60 |
70 |
80 |
90 |
100 |
110 |
120 |
130 |
140 |
150 |
AMBIENTTEMPERATURE ( oC)
PERCENT OF PEAKVALUE
100 |
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50 |
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0 |
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3 |
O1 |
t |
TIME |
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t1 |
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SURFACEMOUNT VARISTORS |
O1 |
= VIRTUAL ORIGIN OFWAVE |
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t2 |
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FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
FOR CLAMPING VOLTAGE
t = TIME FROM 10% TO 90% OF PEAK t1 = VIRTUAL FRONT TIME = 1.25 x t
t2 = VIRTUALTIME TO HALFVALUE (IMPULSE DURATION)
FIGURE 1. PEAK CURRENT AND ENERGY |
EXAMPLE: |
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DERATING CURVE |
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FOR AN 8/20 s CURRENT WAVEFORM |
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8 s = t1 = VIRTUAL FRONT TIME |
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20 s = t2 = VIRTUALTIME TO |
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HALFVALUE |
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100 |
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MAXIMUM CLAMPING VOLTAGE |
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Voltage (V) |
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MAXIMUM LEAKAGE |
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10 |
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Varistor |
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V18MLA0402 |
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V14MLA0402 |
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V09MLA0402 |
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V5.5MLA0402 |
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1 A |
10 A |
100 A |
1mA |
10mA |
100mA |
1A |
10A |
100A |
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CURRENT (A) |
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FIGURE 3. LIMIT V-I CHARACTERISTIC FOR V5.5MLA0402 TO V18MLA0402
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