Varistor Products
Axial Lead / Application Specific Varistors > MA Series
RoHS
MA Varistor Series
Description
The MA Series of transient surge suppressors are axial
lead Metal Oxide Varistors (MOVs) for use in a wide
variety of board level industrial and commercial electronic
equipment. They are intended to protect components and
signal/data lines from low energy transients where the
small axial lead package is required.
The MA Series is offered with standard ('S' suffix) or
tightened ('B' suffix) clamping voltage.
See MA Series Device Ratings and Specifications Table for
part number and brand information.
Agency Approvals
Agency
Features
Agency File Number
None
t NNEJBNFUFS
disc size
t "WBJMBCMFJOUBQFBOE
reel or bulk packaging
t 4NBMMBYJBMMFBE
package
t /PEFSBUJOHVQUP
85ºC ambient
t 8JEFPQFSBUJOHWPMUBHF
range:
VM(AC)RMS 9V to 264V
VM(DC)
13V to 365V
t /FXCMBDLFQPYZPGGFST
improved performance
for high temperature
Lead-free wave
soldering process.
Absolute Maximum Ratings
t'PSSBUJOHTPGJOEJWJEVBMNFNCFSTPGBTFSJFTTFF%FWJDF3BUJOHTBOE4QFDJmDBUJPOTDIBSU
Continuous
MA Series
Units
Steady State Applied Voltage:
AC Voltage Range (VM(AC)RMS)
9 to 264
V
DC Voltage Range (VM(DC))
13 to 365
V
40 to 100
A
Transient:
Peak Pulse Current (ITM)
For 8/20μs Current Wave(See Figure 2)
For 2ms Current Square Wave (WTM)
0.06 to 1.7
J
Operating Ambient Temperature Range (TA)
-55 to +85
°C
Storage Temperature Range (TSTG)
-55 to +125
°C
<0.01
%/°C
1000
V
1000
MΩ
Temperature Coefficient (αV) of Clamping Voltage (VC) at Specified Test Current
Hi-Pot Encapsulation (COATING Isolation Voltage Capability)
Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301)
COATING Insulation Resistance
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ma.html for current information.
183
Revision: January 9, 2009
MA Varistor Series
MA Series
Single-Pulse Energy Range
Varistor Products
Axial Lead / Application Specific Varistors > MA Series
MA Series Ratings & Specifications
Maximum Rating (85°C)
Continuous
Part
Number
Brand
(mm)
Specifications (25°C)
Transient
Peak
Current
(8/20μs)
Varistor Voltage at 1mA
DC Test Current
Max Clamping
Volt VC at 2.0A
(8/20μs)
Typical
Capacitance
VRMS
VDC
Energy
(10/1000μs)
VM(AC)
VM(DC)
WTM
ITM
Min
VN(DC)
Max
VC
f = 1MHz
(V)
(V)
(J)
(A)
(V)
(V)
(V)
(A)
(pF)
V18MA1A
V18MA1A
V18MA1A
18A
18B
18C
9
10
10
13
14
14
0.06
0.07
0.06
40
40
40
14
15
15
18
18
18
23
21
21
49
44
49
550
550
550
V22MA1A
V22MA1B
V22MA1S
22A
22B
22S
10
14
14
15
18
18
0.09
0.10
0.09
40
40
40
16
19
19
22
22
22
28
26
26
55
51
55
410
410
410
V27MA1A
V27MA1B
V27MA1S
27A
27B
27S
13
17
17
19
22
22
0.10
0.11
0.10
40
40
40
21
24
24
27
27
27
34
31
31
67
59
67
370
370
370
V33MA1A
V33MA1B
V33MA1S
33A
33B
33S
18
20
20
23
26
26
0.13
0.15
0.14
40
40
40
26
29.5
29.5
33
33
33
40
36.5
36.5
73
67
73
300
300
300
V39MA2A
V39MA2B
V39MA2S
39A
39B
39S
22
25
25
28
31
31
0.16
0.18
0.17
40
40
40
31
35
35
39
39
39
47
43
43
86
79
86
250
250
250
V47MA2A
V47MA2B
V47MA2S
47A
47B
47S
27
30
30
34
38
38
0.19
0.21
0.19
40
40
40
37
42
42
47
47
47
57
52
52
99
90
99
210
210
210
V56MA2A
V56MA2B
V56MA2S
56A
56B
56S
32
35
35
40
45
45
0.23
0.25
0.23
40
40
40
44
50
50
56
56
56
68
62
62
117
108
117
180
180
180
V68MA3A
V68MA3B
V68MA3S
68A
68B
68S
38
40
40
48
56
56
0.26
0.30
0.27
40
40
40
54
61
61
68
68
68
82
75
75
138
127
138
150
150
150
V82MA3A
V82MA3B
V82MA3S
82A
82B
82S
45
50
50
60
66
66
0.33
0.37
0.34
40
40
40
65
73
73
82
82
82
99
91
91
163
150
163
120
120
120
V100MA4A
V100MA4B
V100MA4S
100
101
102
57
60
60
72
81
81
0.40
0.45
0.42
40
40
40
80
90
90
100
100
100
120
110
110
200
185
200
100
100
100
V120MA1A
V120MA2B
V120MA2S
120
121
122
72
75
75
97
101
101
0.40
0.50
0.46
100
100
100
102
108
108
120
120
120
138
132
132
220
205
220
40
40
40
V150MA1A
V150MA2B
150
151
88
92
121
127
0.50
0.60
100
100
127
135
150
150
173
165
255
240
32
32
V180MA1A
V180MA3B
180
181
105
110
144
152
0.60
0.70
100
100
153
162
180
180
207
198
310
290
27
27
V220MA2A
V220MA4B
220
221
132
138
181
191
0.80
0.90
100
100
187
198
220
220
253
242
380
360
21
21
V270MA2A
V270MA4B
270
271
163
171
224
235
0.90
1.00
100
100
229
243
270
270
311
297
460
440
17
17
V330MA2A
V330MA5B
330
331
188
200
257
274
1.00
1.10
100
100
280
297
330
330
380
363
570
540
14
14
V390MA3A
V390MA6B
390
391
234
242
322
334
1.20
1.30
100
100
331
351
390
390
449
429
670
640
12
12
V430MA3A
V430MA7B
430
431
253
264
349
365
1.50
1.70
100
100
365
387
430
430
495
473
740
700
11
11
NOTE: Average power dissipation of transients not to exceed 200mW.
MA Varistor Series
184
Revision: January 9, 2009
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ma.html for current information.
Varistor Products
Axial Lead / Application Specific Varistors > MA Series
Power Dissipation Ratings
Peak Pulse Current Test Waveform
PERCENT OF PEAK VALUE
PERCENT OF RATED VALUE
100
90
80
70
60
50
40
30
20
100
90
50
10
O1
10
T
TIME
T1
0
-55
50
60
Figure 1
T2
70 80 90 100 110 120 130 140 150
AMBIENT TEMPERATURE ( oC)
Figure 2
01 = Virtual Origin of Wave
T = Time from 10% to 90% of Peak
T1 = Rise Time = 1.25 x T
T2 = Decay Time
Example - For an 8/20 μs Current Waveform:
8μs = T1 = Rise Time
20μs = T2 = Decay Time
Should transients occur in rapid succession, the average power
dissipation required is simply 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.
Furthermore, the operating values need to be derated at high
temperatures as shown above. Because varistors can only
dissipate a relatively small amount of average power they are,
therefore, not suitable for repetitive applications that involve
substantial amounts of average power dissipation.
Repetitive Surge Capability
V18MA - V100MA
V120MA1A/S - V430MA3A
100
1
DISC SIZE 3mm
V18MA1A - V100MA4B
2
10
5
2
10
10 3
10 4
1
0.5
0.2
10
0.1
20
Figure 3
10 3
10 4
10 5
10 6
10 2
5
2
1
0.5
INDEFINITE
DISC SIZE 3mm
V120MA1A - V430MA7B
1
10
20
10 5
10 6
10 2
SURGE CURRENT (A)
SURGE CURRENT (A)
20
2
50
INDEFINITE
0.2
0.1
100
1,000
IMPULSE DURATION (μs)
20
10,000
100
1,000
IMPULSE DURATION (μs)
10,000
Figure 4
NOTE: If pulse ratings are exceeded, a shift of VN(DC) (at specified current) of more than
+/-10% could result. This type of shift, which normally results in a decrease of VN(DC), may
result in the device not meeting the original published specifications, but it does not
prevent the device from continuing to function, and to provide ample protection.
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ma.html for current information.
185
Revision: January 9, 2009
MA Varistor Series
MA Series
50
Varistor Products
Axial Lead / Application Specific Varistors > MA Series
Maximum Clamping Voltage
V18MA1B - V100MA4B
V18MA1A/S - V100MA4A/S
600
MAXIMUM PEAK VOLTS (V)
400
MAX CLAMPING VOLTAGE
DISC SIZE 3mm
18 TO 100V N(DC) RATING
TA = -55o C TO 85o C
600
500
400
V100MA4A/S
V82MA3A/S
V68MA3A/S
V56MA2A/S
MAXIMUM PEAK VOLTS (V)
800
300
200
150
100
80
60
V47MA2A/S
V39MA2A/S
V33MA1A/S
V27MA1A/S
V22MA1A/S
V18MA1A/S
40
30
20
10 -2
10 -1
Figure 5
10 0
PEAK AMPERES (A)
10 1
4,000
V430MA3A
V390MA3A
V330MA2A
V270MA2A
V220MA2A
3,000
1,000
800
600
400
200
V180MA1A
V150MA1A
V120MA1A/S
100
10 -2
Figure 7
MA Varistor Series
10 -1
10 -2
10 -1
10 0
10 1
PEAK AMPERES (A)
10 2
10 3
V120MA2B - V430MA7B
MAX CLAMPING VOLTAGE
DISC SIZE 3mm
120 TO 430VN(DC) RATING
TA = -55o C TO 85o C
1,500
V56MA2B
V47MA2B
V39MA2B
V33MA1B
V27MA1B
V22MA1B
V18MA1B
Figure 6
MAXIMUM PEAK VOLTS (V)
MAXIMUM PEAK VOLTS (V)
2,000
100
90
80
70
60
50
40
20
10 -3
10 2
V100MA4B
V82MA3B
V68MA3B
200
30
V120MA1A/S - V430MA3A
4,000
300
MAX CLAMPING VOLTAGE
DISC SIZE 3mm
18 TO 100V N(DC) RATING
TA = -55o C TO 85o C
10 0
PEAK AMPERES (A)
10 1
2,000
200
Figure 8
186
Revision: January 9, 2009
V430MA7B
V390MA6B
V330MA5B
V270MA4B
V220MA4B
V180MA3B
V150MA2B
V120MA2B
1,000
900
800
700
600
500
400
300
100
10 -3
10 2
MAXIMUM CLAMPING VOLTAGE
DISC SIZE 3mm
120 TO 430VN(DC) RATING
TA = -55o C TO 85o C
10 -2
10 -1
10 0
10 1
PEAK AMPERES (A)
10 2
10 3
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ma.html for current information.
Varistor Products
Axial Lead / Application Specific Varistors > MA Series
Wave Solder Profile
Non Lead–free Profile
Lead–free Profile
300
300
250
TEMPERATURE (ºC)
TEMPERATURE (ºC)
Maximum Wave 260C
Maximum Wave 240C
250
200
150
100
150
100
50
50
0
0
Figure 9
200
0
0.5
1
1.5
2
2.5
3
3.5
0
4
1
1.5
2
2.5
3
3.5
4
TIME(MINUTES)
Physical Specifications
Product Dimensions
L
L
D
b (diameter)
Symbol
0.5
Figure 10
TIME(MINUTES)
Lead Material
Tin–plated Copper clad steel
Soldering
Characteristics
Solderability per MIL–STD–202,
Method 208E
Insulating Material
Cured, flame retardant epoxy polymer
meets UL94V–0 requirements
Device Labeling
Marked with LF, voltage and date code
H
Inches
Millimeters
Min
Max
Min
Max
Øb
0.024
0.026
0.61
0.66
ØD
0.118
0.177
3.0
4.5
H
0.177
0.276
4.5
7.0
L
1.740
1.220
27.3
31.0
Environmental Specifications
Operating/Storage
Temperature
-40°C to +85°C
Passive Aging
+85°C, 1000 hours
+/-10% typical voltage change
Humidity Aging
+85°C, 85% RH, 1000 hours
+/-10% typical voltage change
Thermal Shock
+85°C to -40°C 5 times
+/-10% typical voltage change
Solvent Resistance
MIL–STD–202, Method 215F
Moisture Sensitivity
Level 1, J–STD–020C
Typical Weight = 0.5g
Tape and Reel Dimensions
0.063” max
H2
0.200” +/- 0.02
MA Series
H1 = H2 +/- 0.040”
H1
Part Numbering System
0.080” max
V XXX MA XX
0.240”+/- 0.040
VARISTOR
2.062”+/- 0.059
ENERGY/CLAMPING
VOLTAGE VARIANT
2.681” max
VARISTOR VOLTAGE
(VN at 1mA)
Conforms to EIA Standard RS-296-E
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ma.html for current information.
187
Revision: January 9, 2009
SERIES DESIGNATOR
MA: Bulk Pack
MT: Tape and Reel
MA Varistor Series