Varistor Products

©2011 Littelfuse, Inc.

Revision: September 25, 2011

Specifications are subject to change without notice.

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

inconjunctionwithappropriateenclosuredesign,to

helpfacilitateSPDmodulecompliancetoUL1449,3rd

EditionSection39.4(abnormalovervoltagelimitedcurrent

requirements).Undertheseextremeabnormalovervoltage

conditions,someunitswillexhibitsubstantialheating,

arcingandventingpriortoopening.Modulesshouldbe

designedtocontainthispossibility.Applicationtestingis

stronglyrecommended.

Thermal Characteristics

* Figure 4:Typical time to open circuit under UL1449

Abnormal Overvoltage Limited CurrentTest

0.1

1

10

10

100100010000

Time(s)

0.125A

0.5A

2.5A

5A

Typical

For applications exceeding 85˚C ambient

temperature, the peak surge current and energy

ratings must be reduced as shown in Figure 5.

Figure 5: Peak Current & Energy Derating Curve

0

20

40

60

80

100

-555060708090

100

110

120

130

AMBIENT TEMPERATURE (ºC)

Current, Energy, Power Derating Curve

100

1000

10000

0.000001 0.000010.0001 0.001

0.01

0.11

10

1001000

10000

Peak Current (A)

175V

150V

140V

130V

320V

300V

275V

250V

230V

Figure 6: V-I Characteristic Curves for 14mm Types

420V

385V

115V

Maximum Leakage Current

Maximum Clamping Voltage

14mm

200V

460V

510V

550V

575V

625V

750V

Maximum Clamping Voltage for 14mm Parts

Maximum Clamping Voltage for 20mm Parts

100

1000

10000

0.000001 0.00001 0.0001 0.0010.010.1

110

100

1000 10000

Peak Current (A)

175V

150V

140V

130V

320V

275V

250V

230V

Figure 7: V-I Characteristic Curves for 20mm Types

420V

385V

115V

Maximum Leakage Current

Maximum Clamping Voltage

20mm

200V

460V

510V

550V

575V

625V

750V

300V

Forapplicationsexceeding85°Cambienttemperature,the

peaksurgecurrentandenergyratingsmustbereducedas

shownabove.

Figure 1

Figure 2

Figure 3

Figure 4