Littelfuse SM20 Varistor Series Manual de usuario descargar pdf

Revised: February 6, 2014

Varistor Products

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.

SM20 Series

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

26-420VDC

• 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"wafe"

tray packaging

Agency Approvals

Absolute Maximum Ratings

•Forratingsofindividualmembersofaseries,seeDeviceRatingsandSpecicationschart

Agency Agency File Number

E320116

Continuous

SM20 Series Units

Steady State Applied Voltage:

ACVoltageRange(V

M(AC)RMS

) 20 to 320 V

DCVoltageRange(V

M(DC)

) 26 to 420 V

Transients:

PeakPulseCurrent(I

)8/20µs Current Wave, Single Pulse up to 6500 A

Single Pulse Energy Capability (W

)10/1000µs Current Wave 165 J

LoadDumpEnergyCapability(td>=30ms) 160 J

OperatingAmbientTemperatureRange(T

) -40 to +85

StorageTemperatureRange(T

STG

) -55 to +125

TemperatureCoefcient(a

)ofClampingVoltage(V

)atSpecied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.

SM20 Varistor Series

RoHS

1 2 3 4

Indice de contenidos

Pagina 1 - SM20 Varistor Series

Pagina 2 - PERCENT OF RATED VALUE

Pagina 3 - FIGURE 15.WAVE SOLDER PROFILE

Pagina 4 - V 275 SM20

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Littelfuse SM20 Varistor Series Manual de usuario

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