Littelfuse MA Series Catalog Page

Varistor Products

Axial Lead / Application Specific Varistors > MA Series

RoHS

MA Varistor Series

Agency Approvals

Agency Agency File Number

None

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.

Features

t NNEJBNFUFS

disc size

t 4NBMMBYJBMMFBE

package

t 8JEFPQFSBUJOHWPMUBHF

range:
V
V

9V to 264V

M(AC)RMS

13V to 365V

M(DC)

t "WBJMBCMFJOUBQFBOE

reel or bulk packaging

t /PEFSBUJOHVQUP

85ºC ambient

t /FXCMBDLFQPYZPGGFST

improved performance
for high temperature
Lead-free wave
soldering process.

Absolute Maximum Ratings

t'PSSBUJOHTPGJOEJWJEVBMNFNCFSTPGBTFSJFTTFF%FWJDF3BUJOHTBOE4QFDJmDBUJPOTDIBSU

Continuous MA Series Units
Steady State Applied Voltage:

AC Voltage Range (V

DC Voltage Range (V

Transient:

Peak Pulse Current (I

For 8/20μs Current Wave(See Figure 2) 40 to 100 A

Single-Pulse Energy Range

For 2ms Current Square Wave (W

Operating Ambient Temperature Range (T

Storage Temperature Range (T

Temperature Coefficient (αV) of Clamping Voltage (V

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 1000 MΩ

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.

)

TM

) -55 to +125 °C

STG

) 9 to 264 V

M(AC)RMS

) 13 to 365 V

M(DC)

) 0.06 to 1.7 J

) -55 to +85 °C

A

TM

) at Specified Test Current

C

<0.01 %/°C

1000 V

MA Series

©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

Axial Lead / Application Specific Varistors > MA Series

MA Series Ratings & Specifications

Maximum Rating (85°C) Specifications (25°C)

Continuous Transient

Part

Number

V18MA1A
V18MA1A
V18MA1A

V22MA1A
V22MA1B
V22MA1S

V27MA1A
V27MA1B
V27MA1S

V33MA1A
V33MA1B
V33MA1S

V39MA2A
V39MA2B
V39MA2S

V47MA2A
V47MA2B
V47MA2S

V56MA2A
V56MA2B
V56MA2S

V68MA3A
V68MA3B
V68MA3S

V82MA3A
V82MA3B
V82MA3S

V100MA4A
V100MA4B
V100MA4S

V120MA1A
V120MA2B
V120MA2S

V150MA1A
V150MA2B

V180MA1A
V180MA3B

V220MA2A
V220MA4B

V270MA2A
V270MA4B

V330MA2A
V330MA5B

V390MA3A
V390MA6B

V430MA3A
V430MA7B

Brand

(mm)

18A
18B
18C

22A
22B

22S

27A
27B

27S

33A
33B

33S

39A
39B

39S

47A
47B

47S

56A
56B

56S

68A
68B
68S

82A
82B
82S

100

101

102

120
121
122

150
151

180
181

220
221

270
271

330
331

390
391

430
431

V

RMS

V

M(AC)

(V) (V) (J) (A) (V) (V) (V) (A) (pF)

9
10
10

10
14
14

13
17
17

18
20
20

22
25
25

27
30
30

32
35
35

38
40
40

45
50
50

57
60
60

72
75
75

88
92

105
110

132
138

163
171

188
200

234
242

253
264

V

V

M(DC)

13
14
14

15
18
18

19
22
22

23
26
26

28
31
31

34
38
38

40
45
45

48
56
56

60
66
66

72
81
81

97
101
101

121
127

144
152

181
191

224
235

257
274

322
334

349
365

DC

Varistor Products

Energy

(10/1000μs)

WTM I

0.06

0.07

0.06

0.09

0.10

0.09

0.10

0.11

0.10

0.13

0.15

0.14

0.16

0.18

0.17

0.19

0.21

0.19

0.23

0.25

0.23

0.26

0.30

0.27

0.33

0.37

0.34

0.40

0.45

0.42

0.40

0.50

0.46

0.50

0.60

0.60

0.70

0.80

0.90

0.90

1. 0 0

1. 0 0

1. 10

1.20

1.30

1.50

1.70

Peak

Current

(8/20μs)

40
40
40

40
40
40

40
40
40

40
40
40

40
40
40

40
40
40

40
40
40

40
40
40

40
40
40

40
40
40

100
100
100

100
100

100
100

100
100

100
100

100
100

100
100

100
100

Varistor Voltage at 1mA

DC Test Current

Min V

TM

14
15
15

16
19
19

21
24
24

26

29.5

29.5

31
35
35

37
42
42

44
50
50

54
61
61

65
73
73

80
90
90

102
108
108

127
135

153
162

187
198

229
243

280
297

331
351

365
387

N(DC)

18
18
18

22
22
22

27
27
27

33
33
33

39
39
39

47
47
47

56
56
56

68
68
68

82
82
82

100
100
100

120
120
120

150
150

180
180

220
220

270
270

330
330

390
390

430
430

Max Clamping

at 2.0A

Volt V

C

(8/20μs)

Typical

Capacitance

Max VC f = 1MHz

23
21
21

28
26
26

34
31
31

40

36.5

36.5

47
43
43

57
52
52

68
62
62

82
75
75

99
91
91

120
110
110

138
132
132

173
165

207
198

253
242

311
297

380
363

449
429

495
473

49
44
49

55
51
55

67
59
67

73
67
73

86
79
86

99
90
99

117
108
117

138
127
138

163
150
163

200
185
200

220
205
220

255
240

310
290

380
360

460
440

570
540

670
640

74 0
700

550
550
550

410
410
410

370
370
370

300
300
300

250
250
250

210
210
210

180
180
180

150
150
150

120
120
120

100
100
100

40
40
40

32
32

27
27

21
21

17
17

14
14

12
12

11
11

NOTE: Average power dissipation of transients not to exceed 200mW.

MA Varistor Series

184

Revision: January 9, 2009

©2008 Littelfuse, Inc.

Please refer to www.littelfuse.com/series/ma.html for current information.

Specifications are subject to change without notice.

Varistor Products

Axial Lead / Application Specific Varistors > MA Series

Power Dissipation Ratings

100

90

80

70

60

50

40

30

20

PERCENT OF RATED VALUE

10

0

-55 50 60 70 80 90 100 110 120 130 140 150

Figure 1

AMBIENT TEMPERATURE (

o

C)

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.

Peak Pulse Current Test Waveform

100

90

50

PERCENT OF PEAK VALUE

10

O

1

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

T

T

1

T

2

TIME

Repetitive Surge Capability

V18MA - V100MA

50

1

2

20

10

10

2

10

5

3

10

4

10

2

1

SURGE CURRENT (A)

0.5

INDEFINITE

0.2

0.1
20 100 1,000 10,000

Figure 3

IMPULSE DURATION (μs)

DISC SIZE 3mm
V18MA1A - V100MA4B

5

10

6

10

V120MA1A/S - V430MA3A

100

1

2

50

10

20

2

10

10

5

2

1

SURGE CURRENT (A)

0.5
INDEFINITE

0.2

0.1

20 100 1,000 10,000

IMPULSE DURATION(μs)

DISC SIZE 3mm
V120MA1A - V430MA7B

3

10

4

10

5

10

6

10

Figure 4

NOTE: If pulse ratings are exceeded, a shift of V
+/-10% could result. This type of shift, which normally results in a decrease of V
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.

(at specified current) of more than

N(DC)

N(DC)

, may

MA Series

©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

Axial Lead / Application Specific Varistors > MA Series

Maximum Clamping Voltage

Varistor Products

V18MA1A/S - V100MA4A/S

800

MAX CLAMPING VOLTAGE
DISC SIZE 3mm

600

18 TO 100V
T

= -55oC TO 85oC

400

A

300

200

150

100

80

60

MAXIMUM PEAK VOLTS (V)

40

30

20

-2

10

Figure 5

V120MA1A/S - V430MA3A

4,000

MAX CLAMPING VOLTAGE
DISC SIZE 3mm
120 TO 430V

2,000

T

= -55oC TO 85oC

A

1,500

1,000

800

600

400

MAXIMUM PEAK VOLTS (V)

200

100

-2

10

10

Figure 7

RATING

N(DC)

-1

10

PEAK AMPERES (A)

RATING

N(DC)

-1

PEAK AMPERES (A)

V100MA4A/S

0

10

0

10

V82MA3A/S

V68MA3A/S

V56MA2A/S

V22MA1A/S

V18MA1A/S

V430MA3A

V390MA3A

V330MA2A

V270MA2A

V120MA1A/S

V47MA2A/S

V39MA2A/S

V33MA1A/S

V27MA1A/S

1

10

V220MA2A

V180MA1A

V150MA1A

1

10

V18MA1B - V100MA4B

600

MAX CLAMPING VOLTAGE

500

DISC SIZE 3mm

400

18 TO 100V
T

= -55oC TO 85oC

300

A

200

100

90
80
70
60

50
40

MAXIMUM PEAK VOLTS (V)

30

20

-3

2

10

10

N(DC)

-2

10

RATING

-1

10

PEAK AMPERES (A)

0

10

V33MA1B

V27MA1B

V22MA1B

V18MA1B

1

10

V100MA4B
V82MA3B
V68MA3B

V56MA2B

V47MA2B

V39MA2B

10

2

3

10

Figure 6

V120MA2B - V430MA7B

4,000

MAXIMUM CLAMPING VOLTAGE
DISC SIZE 3mm

3,000

120 TO 430V

2,000

T

= -55oC TO 85oC

A

1,000

900
800
700
600

500
400

300

MAXIMUM PEAK VOLTS (V)

200

100

2

10

-3

10

10

Figure 8

N(DC)

-2

RATING

-1

10

0

10

PEAK AMPERES (A)

V430MA7B
V390MA6B
V330MA5B

V270MA4B
V220MA4B
V180MA3B

V150MA2B
V120MA2B

1

2

10

10

3

10

MA Varistor Series

186

Revision: January 9, 2009

©2008 Littelfuse, Inc.

Please refer to www.littelfuse.com/series/ma.html for current information.

Specifications are subject to change without notice.

Wave Solder Profile

TEMPERATURE

(ºC)

TEMPERATURE

(ºC)

Varistor Products

Axial Lead / Application Specific Varistors > MA Series

Non Lead–free Profile

300

250

200

150

100

50

0

Figure 9

00.511.522.533.54

Product Dimensions

LL

(diameter)

Maximum Wave 240C

TIME(MINUTES)

Hb

D

Lead–free Profile

300

250

200

150

100

50

0

Figure 10

00.511.522.533.54

Maximum Wave 260C

TIME(MINUTES)

Physical Specifications

Lead Material Tin–plated Copper clad steel

Soldering
Characteristics

Insulating Material

Solderability per MIL–STD–202,
Method 208E

Cured, flame retardant epoxy polymer
meets UL94V–0 requirements

Symbol

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

Typical Weight = 0.5g

Tape and Reel Dimensions

H1 = H2 +/- 0.040”

0.063” max

H1 H2

0.200” +/- 0.02

Device Labeling Marked with LF, voltage and date code

Environmental Specifications

Operating/Storage
Temperature

Passive Aging

Humidity Aging

Thermal Shock

Solvent Resistance MIL–STD–202, Method 215F

-40°C to +85°C

+85°C, 1000 hours
+/-10% typical voltage change

+85°C, 85% RH, 1000 hours
+/-10% typical voltage change

+85°C to -40°C 5 times
+/-10% typical voltage change

Moisture Sensitivity Level 1, J–STD–020C

Part Numbering System

0.080” max

0.240”+/- 0.040

2.062”+/- 0.059

2.681” max

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.

Revision: January 9, 2009

VARISTOR

VARISTOR VOLTAGE

(VN at 1mA)

187

V XXX MA XX

SERIES DESIGNATOR

MA: Bulk Pack

MT: Tape and Reel

MA Series

ENERGY/CLAMPING
VOLTAGE VARIANT

MA Varistor Series