© 2014 Littelfuse, Inc.

Specifications are subject to change without notice.

Revised: 05/23/14

Varistor Products

Thermally Protected Varistors > SMOV25S Series

Part

Number

Maximum Rating (75°C)

Specifications (25 °C)

Continuous

Transient

Varistor

Voltage at

1mATest

Current

Maximum

Clamping

Voltage

8/20μs

Typical

Capacitance

f = 1MHz

AC

Volts

DC

Volts

Energy

2ms

Peak Surge

Current

8/20μs

Nominal

Discharge

Current (In)

V

M(AC)

V

M(DC)

W

TM

I

TM

1 × Pulse

In

V

N(DC)

Min

V

N(DC)

Max

Vc

I

PK

C

(V)

(V)

(J)

(A)

(A)

(V)

(V)

(A)

(pF)

SMOV25S111MP

115

150

170

20000

10000

162

198

295

100

3200

SMOV25S111NP

SMOV25S131MP

130

170

190

20000

10000

184.5

225.5

335

100

2800

SMOV25S131NP

SMOV25S151MP

150

200

220

20000

10000

216

264

390

100

2300

SMOV25S151NP

SMOV25S181MP

175

225

250

20000

10000

243

297

450

100

1900

SMOV25S181NP

SMOV25S251MP

250

320

330

20000

10000

351

429

640

100

1400

SMOV25S251NP

SMOV25S271MP

275

350

350

20000

10000

387

473

700

100

1250

SMOV25S271NP

SMOV25S301MP

300

385

370

20000

10000

423

517

765

100

1150

SMOV25S301NP

SMOV25S321MP

320

420

390

20000

10000

459

561

825

100

1080

SMOV25S321NP

SMOV25S421MP

420

560

460

20000

10000

612

748

1100

100

820

SMOV25S421NP

SMOV25S461MP

460

615

490

20000

10000

675

825

1220

100

750

SMOV25S461NP

SMOV25S511MP

510

670

520

20000

10000

738

902

1335

100

680

SMOV25S511NP

SMOV25S551MP

550

745

550

20000

10000

819

1001

1475

100

630

SMOV25S551NP

SMOV25S621MP

620

800

600

20000

10000

900

1100

1625

100

550

SMOV25S621NP

SMOV25S751MP

750

970

670

20000

10000

1080

1320

1950

100

460

SMOV25S751NP

Device Ratings & Specifications

Averagepowerdissipationoftransientsshouldnotexceed1.5watts

SameratingsandspecificationsapplytoNonIsolatedMonitoredSwitchalternativedesign.Replace"M"with"N"inthepartnumber.e.g.:SMOV25S111NP.

RefertoPartNumberSystemattheendofthisdocument.