© 2014 Littelfuse, Inc.

Specifications are subject to change without notice.

Revised: 05/23/14

Varistor Products

Thermally Protected Varistors > SMOV25S Series

Operating/Storage Temp. -45°Cto+75°C/-45°Cto+85°C

Passive Aging

+75°C,1000hours

-/+10%typicalvoltagechange

Humidity Aging

+75°C,85%R.H.,1000hours

-/+10%typicalvoltagechange

Thermal Shock

+75°Cto-40°C5times

-/+10%typicalvoltagechange

Solvent Resistance

MIL-STD-202,Method215F

Moisture Sensitivity

Level1,J-STD-020C

Lead Material

Tin–plated

Soldering

Characteristics

SolderabilityperMIL-STD-202,

Method208E

Insulating Material

Cured,flameretardantepoxypolymer

meetsUL94V-0requirements

Device Labeling

MarkedwithLF,voltage,ULlogos,and

datecode

Physical Specifications

Environmental Specifications

SMOV25S Pulse Rating Curve

1

2

∞

15

10

2

10

3

1

10

100

1000

10000

100000

10

100

1000

10000

Impulse Duration (secs)

10

4

10

5

10

6

Figure 4

Wave Solder Profile

BecausetheSMOV25SSeriesvaristorscontainathermalprotec-

tiondevice,caremustbetakenwhensolderingthedevicesinto

place.Twosolderingmethodsarepossible.Firstly,handsoldering:

0

50

100

150

200

250

300

00.5

11.5

22.5

33.5

4

TIME(MINUTES)

Maximum Wave 240C

Lead–free Profile

0

50

100

150

200

250

300

00.5

11.5

22.5

33.5

4

TIME(MINUTES)

Maximum Wave 260C

Non Lead–free Profile

Itisrecommendedtoheat–sinktheleadsofthedevice.Secondly,

wave–soldering:Itiscriticallyimportantthatallpreheatstageand

thesolderbathtemperaturesarerigidlycontrolled.

Figure 5

Figure 6