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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 compo-
nents 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 suit-
able 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 compat-
ible 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
•-55
o
C to +125
o
C 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
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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.
Continuous:
ML SERIES
Steady State Applied Voltage:
DC Voltage Range (VM(DC)). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 to 120
AC Voltage Range (VM(AC)RMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 to 107
Transient:
Non-Repetitive Surge Current, 8/20µs Waveform, (ITM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 to 500
Non-Repetitive Surge Energy, 10/1000µs Waveform, (WTM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2 to 2.5
Operating Ambient Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to + 125
Storage Temperature Range (TSTG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to + 150
Temperature Coefficient (αV) of Clamping Voltage (VC) at Specified Test Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.01
UNITS
V
V
A
J
O
C
O
C
%/
O
C
3
SURFACE MOUNT
VARISTORS
Device Ratings and Specifications
MAXIMUM RATINGS (125
o
C)
MAXIMUM
NON-
REPETITIVE
SURGE
CURRENT
(8/20µs)
MAXIMUM
NON-
REPETITIVE
SURGE
ENERGY
(10/1000µs)
MAXIMUM
CLAMPING
VOLTAGE AT
10A
(OR AS NOTED)
(8/20µs)
SPECIFICATIONS (25
o
C)
MAXIMUM
CONTINUOUS
WORKING
VOLTAGE
NOMINAL VOLTAGE
AT 1mA DC TEST
CURRENT
V
N(DC)
V
N(DC)
MAX
(V)
7.0
7.0
7.0
7.0
9.3
9.3
9.3
9.3
9.3
14
14
16.0
14
18.5
20.3
20.3
20.3
20.3
20.3
TYPICAL
CAPACITANCE
AT f = 1MHz
V
M(DC)
V
M(AC)
PART
NUMBER
V3.5MLA0603
V3.5MLA0805
V3.5MLA0805L
V3.5MLA1206
(V)
3.5
3.5
3.5
3.5
5.5
5.5
5.5
5.5
5.5
9
9
9.0
9.0
12
14
14
14
14
14
(V)
2.5
2.5
2.5
2.5
4.0
4.0
4.0
4.0
4.0
6.5
6.5
6.5
6.5
9.0
10
10
10
10
10
I
TM
(A)
30
120
40
100
20
30
120
40
150
20
4
30
40
40
20
30
120
40
150
W
TM
(J)
0.1
0.3
0.1
0.3
0.050
0.1
0.3
0.1
0.4
0.050
0.020
0.1
0.1
0.1
0.050
0.1
0.3
0.1
0.4
V
C
(V)
10 at 2A
10 at 5A
10 at 2A
14
15.5 at 1A
15.5 at 2A
15.5 at 5A
15.5 at 2A
15.5
22 at 1A
25 at 1A
23 at 2A
20 at 2A
25 at 2A
30 at 1A
30 at 2A
30 at 5A
30 at 2A
30
MIN
(V)
3.7
3.7
3.7
3.7
7.1
7.1
7.1
7.1
7.1
11
11
11.0
11
14
15.9
15.9
15.9
15.9
15.9
C
(pF)
1100
2200
1200
6000
220
660
1600
860
4500
120
33
420
450
350
70
150
480
270
1600
NEW
V5.5MLA0402
V5.5MLA0603
V5.5MLA0805
V5.5MLA0805L
V5.5MLA1206
NEW
NEW
V9MLA0402
V9MLA0402L
V9MLA0603
V9MLA0805L
V12MLA0805L
NEW
V14MLA0402
V14MLA0603
V14MLA0805
V14MLA0805L
V14MLA1206
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Surface Mount Varistors
Multilayer Transient Voltage Surge Suppressors
ML Varistor Series
Device Ratings and Specifications
(Continued)
MAXIMUM RATINGS (125
o
C)
MAXIMUM
NON-
REPETITIVE
SURGE
CURRENT
(8/20µs)
MAXIMUM
NON-
REPETITIVE
SURGE
ENERGY
(10/1000µs)
MAXIMUM
CLAMPING
VOLTAGE AT
10A
(OR AS NOTED)
(8/20µs)
SPECIFICATIONS (25
o
C)
MAXIMUM
CONTINUOUS
WORKING
VOLTAGE
NOMINAL VOLTAGE
AT 1mA DC TEST
CURRENT
V
N(DC)
V
N(DC)
MAX
(V)
28.0
28.0
28.0
28.0
28.0
28.0
38
38.5
38.5
38.5
38.5
46
46
43
43
49
60
66.5
66.5
77
83
90
115
165
TYPICAL
CAPACITANCE
AT f = 1MHz
V
M(DC)
V
M(AC)
PART
NUMBER
(V)
18
18
18
18
18
18
26
26
26
26
26
30
30
30
30
33
42
48
48
56
60
68
85
120
(V)
14
14
14
14
14
14
20
20
20
20
20
25
25
25
25
26
30
40
40
40
50
50
67
107
I
TM
(A)
20
30
120
40
150
500
30
100
40
150
300
30
30
280
220
180
180
250
220
180
250
180
250
125
W
TM
(J)
0.050
0.1
0.3
0.1
0.4
2.5
0.1
0.3
0.1
0.6
1.2
0.1
0.1
1.2
0.9
0.8
0.8
1.2
0.9
1.0
1.5
1.0
2.5
2.0
V
C
(V)
40 at 1A
40 at 2A
40 at 5A
40 at 2A
40
40
58 at 2A
58 at 5A
58 at 2A
56
54
65 at 2A
65 at 2A
62
62
72
86
100
100
110
120
130
160
230
MIN
(V)
22
22
22
22
22
22
31
29.5
29.5
29.5
29.5
37
37
35
35
38
46
54.5
54.5
61
67
76
95
135
C
(pF)
40
125
450
250
1100
1250
90
190
115
900
1000
75
80
1575
1530
550
550
450
430
150
375
150
225
65
NEW
V18MLA0402
V18MLA0603
V18MLA0805
V18MLA0805L
V18MLA1206
V18MLA1210
V26MLA0603
V26MLA0805
V26MLA0805L
V26MLA1206
V26MLA1210
V30MLA0603
V30MLA0805L
V30MLA1210
V30MLA1210L
V33MLA1206
V42MLA1206
V48MLA1210
V48MLA1210L
V56MLA1206
V60MLA1210
V68MLA1206
V85MLA1210
V120MLA1210
NOTES:
1. L suffix is a low capacitance and energy version; Contact your Littelfuse Sales Representative for custom capacitance requirements.
o
2. Typical leakage at 25 C<25µA, maximum leakage 50µA at V
M(DC)
; for 0402 size, typical leakage <5µA, maximum leakage 10µA at V
M(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.
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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 dissipa-
tion 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 125
o
C ambient temperature, the peak
surge current and energy ratings must be derated as shown in Figure 1.
PERCENT OF RATED VALUE
PERCENT OF PEAK VALUE
100
50
0
t
O
1
t
1
TIME
100
80
3
SURFACE MOUNT
VARISTORS
t
2
60
40
20
0
-55
50
60
70
80
90
100
110 120
130 140 150
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
FOR CLAMPING VOLTAGE
O
1
= VIRTUAL ORIGIN OF WAVE
t = TIME FROM 10% TO 90% OF PEAK
t
1
= VIRTUAL FRONT TIME = 1.25 x t
t
2
= VIRTUAL TIME TO HALF VALUE
(IMPULSE DURA
TION)
EXAMPLE:
FOR AN 8/20µs CURRENT WAVEFORM
8µs = t
1
= VIRTUAL FRONT TIME
20µs = t
2
= VIRTUAL TIME TO
HALF VALUE
AMBIENT TEMPERATURE (
o
C)
FIGURE 1. PEAK CURRENT AND ENERGY
DERATING CURVE
100
MAXIMUM CLAMPING VOLTAGE
Varistor Voltage (V)
MAXIMUM LEAKAGE
10
V18MLA0402
V14MLA0402
V09MLA0402
V5.5MLA0402
1
µA
10µA
100µA
1mA
10mA
CURRENT (A)
100mA
1A
10A
100A
FIGURE 3. LIMIT V-I CHARACTERISTIC FOR V5.5MLA0402 TO V18MLA0402
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Surface Mount Varistors
Multilayer Transient Voltage Surge Suppressors
ML Varistor Series
Maximum Transient V-I Characteristic Curves
100
Varistor Voltage (V)
MAXIMUM LEAKAGE
MAXIMUM CLAMPING VOLTAGE
V9MLA0402L
10
1
µA
10µA
100µ A
1mA
10mA
CURRENT (A)
100mA
1A
10A
FIGURE 4. LIMIT V-I CHARACTERISTIC FOR V9MLA0402L
100
MAXIMUM CLAMPING VOLTAGE
MAXIMUM LEAKAGE
Varistor Voltage (V)
10
V30MLA0603
V26MLA0603
V18MLA0603
V14MLA0603
V9MLA0603
V5.5MLA0603
V3.5MLA0603
1
µA
10µA
100µA
1mA
10mA
100mA
1A
10A
100A
CURRENT (A)
FIGURE 5. LIMIT V-I CHARACTERISTIC FOR V3.5MLA0603 TO V30MLA0603
100
MAXIMUM CLAMPING VOLTAGE
MAXIMUM LEAKAGE
Varistor Voltage (V)
10
V30MLA0805L
V26MLA0805L
V18MLA0805L
V14MLA0805L
V9MLA0805L
V5.5MLA0805L
V3.5MLA0805L
1
µA
10µA
100µA
1mA
10mA
100mA
1A
10A
100A
CURRENT (A)
FIGURE 6. LIMIT V-I CHARACTERISTIC FOR V3.5MLA0805L TO V30MLA0805L
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