Littelfuse SM7 Varistor Series Manual do Utilizador descarregar pdf (Página 3)

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

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 VoltagePeak 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

TIM E

Pulse Rating Curves

100

1000

10000

10 100 1000 10000

Impulse Duration (μs)

Surge Current (A)

NOTE: If pulse ratings are exceeded, a shift of V

N(DC)

(at speciﬁed current) of more than

±10% could result. This type of shift, which normally results in a decrease of

N(DC)

, may

result in the device not meeting the original published speciﬁcations, but it does not prevent

the device from continuing to function, and to provide ample protection.

V-I Limit Curves

500

1000

1500

2000

0.001 0.01 0.1 1 10 100 1000

Current(A)

Voltage(V)

V510SM7

V480SM7

V460SM7

V420SM7

V385SM7

V320SM7

V300SM7

V250SM7

V230SM7

V210SM7

V190SM7

V175SM7

V150SM7

V140SM7

V130SM7

V115SM7

100

-55 50 60 70 80 90 100 110 120 130 140 150

AMBIENT TEMPERATURE (

PERCENT OF RATED VALUE

1 2 3 4 5

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