© 2014 Littelfuse, Inc.

Specifications are subject to change without notice.

Revised: 05/23/14

Varistor Products

Thermally Protected Varistors > SMOV25S Series

TypicaltimetoopencircuitunderUL1449Abnormal

OvervoltageLimitedCurrentTest:

Thermal Characteristics

0.1

1

10

110100

10 A

5 A

2.5 A

0.5 A

Time (secs)

Typical

0

20

40

60

80

100

-45506070

80

90

100110

120130

AMBIENTTEMPERATURE (ºC)

Peak Current & Energy Derating Curve

100

1000

10000

10µA

100µA1mA

10mA

100mA1A10A

100A

1000A

10000A

100000A

Peak Current

750

625

550

510

460

440

385

420

115

130

140

150

175

230

250

275

300

320

Transient V–I Characteristic Curves

Forapplicationsexceeding75ºCambienttemperature,the

peaksurgecurrentandenergyratingsmustbereduced

asshownbelow.

Figure 1

Figure 2

Figure 3