Littelfuse SM20 Varistor Series Manual do Utilizador descarregar pdf (Página 2)

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.

Repetitive Surge Capability

V175SM20 - V320SM20

10,000

2,000

200

100

500

20 100 1,000 10,000

IMPULSE DURATION (µs)

SURGE CURRENT (A)

MODEL SIZE 20mm

V175SM20 - V320SM20

INDEFINITE

1,000

5,000

Forapplicationsexceeding85ºCambienttemperature,thepeak

surge current and energy ratings must be reduced as shown below

Peak Pulse Current Test Waveform for Clamping Voltage

Peak Current, Energy and Power Derating Curve

=VirtualOriginofWave

T=Timefrom10%to90%ofPeak

=RiseTime=1.25xT

=DecayTime

Example -Foran8/20µs Current Waveform:

8µs=T

=RiseTime

20µs=T

=DecayTime

PERCENT OF PEAK VALUE Test

100

TIME

100

-55 50 60 70 80 90 100110 120130 140150

AMBIENT TEMPERATURE (

PERCENT OF RATED VALUE

FIGURE 1. CURRENT, ENERGY AND POWER DERATING

CURVE

SM20 Series Ratings & Speciﬁcations

Maximum Rating (85°C) Speciﬁcations (25°C)

Continuous Transient

Varistor Voltage

at 1mA DC

Test Current

Maximum

Clamping

Voltage

8 x 20 µs

Typical

Capacitance

f = 1MHz

RMS

Energy

10 x 1000µs

Peak Current

8 x 20µs

Part

Number

Branding

M(AC)

M(DC)

1x pulse

NOM

Min V

NOM

Max V

(V) (V) (J) (A) (V) (V) (V) (A) (pF)

V26SM20 26SM20 20 26

160(note1)

2000

(10mA)

63 20 12000

V175SM20 175SM20 175 225 90 6500 247 303 455 100 1400

V230SM20 230SM20 230 300 122 6500 324 396 595 100 110 0

V250SM20 250SM20 250 330 130 6500 354 429 650 100 1000

V275SM20 275SM20 275 369 140 6500 389 473 710 100 900

V300SM20 300SM20 300 405 165 6500 420 517 775 10 0 800

V320SM20 320SM20 320 420 150 6500 462 540 810 100 750

1.Energyratingforimpulsedurationof30msminimumtoonehalfofpeakcurrent(automotiveloaddump).

1 2 3 4

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