Varistor Products

©2012 Littelfuse, Inc.

Revision: February 9, 2012

LA Varistor Series

Radial Lead Varistors > LA Series

Specifications are subject to change without notice.

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

Should transients occur in rapid succession, the average

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

Current Energy and Power Dissipation Ratings

Peak Pulse Current Test Waveform

100

90

50

10

T

TIME

0

1

T

1

T

2

Example

μs Current Waveform:

8μ

1

20μ

2

100

90

80

70

60

50

40

30

20

10

0

-55

50

60

70

80

90 100 110 120 130 140 150

Figure 1A - Power Derating for Epoxy Coated

Figure 2

100

90

80

70

60

50

40

30

20

10

0

-55

50

60

70

80

90

100 110 120 130 140 150

device. The operating values 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.

Figure 1B - Power Derating for Phenolic Coated