Varistors Datasheet

© 2026 Littelfuse, Inc.

Specifications are subject to change without notice.

Revised: GD. 01/19/26

4

C-III Series

Radial Leaded Varistors

Should 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. The operating values

Figure 1. Current Energy and Power Dissipation Ratings

Figure 2. Peak Pulse Current Test Waveform

FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM

100

90

50

10

O 1

T

T1

T2

TIME

O 1 = Virtual Origin of Wave

T = Time From 10% to 90% of Peak

T 1 = Virtual Front time = 1.25 •t

T 2 = Virtual Time to Half Value (Impulse Duration)

Example:

For an 8/20 µs Current Waveform:

8s = T 1 = Virtual Front Time

20 s = T 2 = Virtual Time to Half Value

0

1 = Virtual Origin of Wave

T = Time from 10% to 90% of Peak

T

1 = Rise Time = 1.25 x T

T

2 = Decay Time

Example - For an 8/20

µs Current Waveform:

8µs = T

1 = Rise Time

20µs = T

2 = Decay Time

100

90

80

70

60

50

40

30

20

10

0

-55

50

60

70

80

90

100

110

120

130

140 150

AMBIENT TEMPERA TURE ( oC)

FIGURE 1. CURRENT , ENERGY AND PO WER DERA TING

CUR VE

1A - Power Derating for Epoxy Coated

V320LA10C(P)

V300LA10C(P)

V275LA10C(P)

V250LA10C(P)

V175LA5C(P)

V150LA5C(P)

V140LA5C(P)

V130LA5C(P)

V230LA10C(P)

MODEL SIZE = 10mm

10,000

1,000

100

0.001

0.01

0.1

110100

1000

10000

Peak Amperes (A)

V460LA10C(P)

10000

1000

100

0.001

0.01

0.1

110100

1000

10000

PEAK CURRENT (A)

10000

1000

100

0.001

0.01

0.1

110100

1000

10000

PEAK CURRENT (A)

MODEL SIZE = 10MM

TA = -55oC TO 105oC

130 to 625VM(AC) RATING

MAXIMUM CLAMP

VOLTAGE

625

460 440

385

230

250

275

300

320

175

150

140

130

420

550

510

Figure 3. Maximum Clamping Voltage for 10mm Parts

V130LA5C(P) – V625LA10C(P)

10,000

1,000

100

10

1

10

100

1,000

10,000

SURGE IMPULSE DURATION (s)

15

1

2

102

103

104

MODEL SIZE = 14mm

TA = -55oC TO 105oC

10,000

1,000

100

10

1

10

100

1,000

10,000

SURGE IMPULSE DURATION (s)

1

2

103

104

MODEL SIZE = 20mm

TA = -55oC TO 105oC

15

102

104

105

106

∞

103

102

2

1

15

10

100

1,000

10,000

SURGE IMPULSE DURATION (s)

10,000

1,000

100

10

1

MODEL SIZE = 10mm

TA = -55oC TO 105oC

∞

∞

Figure 4. Repetitive Surge Capability for 10mm Parts

V130LA5C(P)-V320LA10C(P)

Transient V-I Characteristics Curves

Pulse Rating Curves

FIGURE 1. CURRENT, ENERGY AND POWER DERATING

CURVE

100

90

80

70

60

50

40

30

20

10

0

-55

50

60

70

80

90

100110 120130 140150

AMBIENTTEMPERATURE ( oC)

of a MOV need to be derated at high temperatures as shown

above. Because varistors only dissipate a relatively small amount

of average power they are not suitable for repetitive applications

that involve substantial amounts of average power dissipation.

1B - Power Derating for Phenolic Coated