Varistor Products

©2010 Littelfuse, Inc.

Revision: May 11, 2010

SM20 Series Varistor

Surface Mount Varistors > SM20 Series

Specifications are subject to change without notice.

Please refer to www.littelfuse.com/series/sm20.html for current information.

Description

The Littelfuse 20mm SMD Series is a surface-mount

metal oxide varistor device, for use in applications

requiring hi-energy / transient current capability.

The AC rated parts are designed to operate

continuously across AC power lines. The DC rated

parts are suitable for Automotive applications. The

series comprises a Nylon molded package with folded

tin plated metal leads for soldering to board.

The SMD Series is based on radial 20mm internal

varistor element with similar characteristics to

the Littelfuse LA / ZA series of varistors.

Features

•

DC Voltage

Rating 26VDC

•

AC Voltage Rating

175 - 320AC

•

No De-Rating up

to 85°C ambient

•

Lead-Free, Halogen-

Free and RoHS

Compliant

•

Low voltage

devices specified

for automotive load

dump energy

•

Available in "waffle"

tray packaging

Agency Approvals

Absolute Maximum Ratings

• For ratings of individual members of a series, see Device Ratings and Specifications chart

Agency

Agency File Number

E320116

Continuous

SM20 Series

Units

Steady State Applied Voltage:

AC Voltage Range (V

20 to 320

V

DC Voltage Range (V

V

Transients:

Peak Pulse Current (I

up to 6500

A

Single Pulse Energy Capability (W

165

J

Load Dump Energy Capability (td>=30ms)

160

J

Operating Ambient Temperature Range (T

-40 to +85

Storage Temperature Range (T

-55 to +125

<0.01

Hi-Pot Encapsulation (COATING Isolation Voltage Capability)

(Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301)

2500

V

COATING Insulation Resistance

1000

MΩ

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only

rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is

not implied.

SM20 Varistor Series