Littelfuse SM7 Varistor Series Manuel d'utilisateur télécharger pdf

Revised: May 8, 2013

Varistor Products

SM7 Series Varistor

Surface Mount Varistors > SM7 Series

Speciﬁcations are subject to change without notice.

Please refer to www.littelfuse.com/series/sm7.html for current information.

SM7 Series

RoHS

Description

The Littelfuse SM7 Series is a plastic-encapsulated

surface-mount metal oxide varistor (MOV) transient

voltage surge suppressor that is designed to be

operated continuously across AC power lines.

The series comprises a Nylon molded package with

tin plated lead frame for soldering to board. The

surface mount SM7 Series is based on radial 7mm

internal varistor element with similar characteristics

to the Littelfuse LA / ZA series of varistor.

Features

• Electrical equivalent

to leaded types

LA/ZA series

• AC Voltage Rating

115 to 510VAC rms

• No De-Rating up

to 85°C ambient

• Good solderability

• Available in tape

and reel

• Application of AC

power meters

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

SM7 Series Units

Steady State Applied Voltage:

AC Voltage Range (V

M(AC)RMS

) 115 to 510 V

DC Voltage Range (V

M(DC)

) 153 to 675 V

Transients:

Peak Pulse Current (I

)

For 8/20μs Current Wave (See Figure 2) 1200 A

Single Pulse Energy Range

For 10/1000μs Current Wave (W

) 10 to 40 J

Operating Ambient Temperature Range (T

) -40 to +85

Storage Temperature Range (T

STG

) -55 to +125

Temperature Coefﬁcient (a

) of Clamping Voltage (V

) at Speciﬁed Test Current <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.

SM7 Varistor Series

1 2 3 4 5

Résumé du contenu

Page 1 - SM7 Varistor Series

Page 2

Page 3 - V-I Limit Curves

Page 4 - TIME (MINUTES)

Page 5 - SM7 SERIES

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Littelfuse SM7 Varistor Series Manuel d'utilisateur

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