About Varistors

Semitec Varistors

A varistor (also known as a voltage-dependent resistor, or VDR) is a resistor whose resistance changes as the voltage across it increases or decreases. Varistors are typically constructed from a ceramic material containing semiconductor materials such as silicon and germanium. They have a relatively large resistance at low voltage levels, but as the voltage increases, their resistance drops significantly, allowing more current to flow through them. This feature makes them useful for absorbing transient voltages, which are sudden increases in the voltage that can occur when a device is powered on or off. Varistors are also commonly used to provide overvoltage protection, where they absorb and dissipate excessive voltages before they reach sensitive electronic components.

Varistors

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(Ex. GST)(▲▼)		Enter Qty ProductVoltage Rating DCVoltage Rating ACClamping VoltageDiameterPeak Surge CurrentSurge Energy RatingCapacitanceOperating Temperature RangeTermination StylePackagingPackage / CaseSeriesMounting StyleVaristor VoltageMinimum Operating TemperatureMaximum Operating TemperatureQualification
  
                      
Z21D391


Varistors 390V 6500A 22.5mm
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Semitec 3988
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USD 0.6397
Multiples of: 1

MOV320 VDC250 VAC845 V22.5 mm2.5 kA275 J210 pF RadialBulk Z21DPCB Mount390 V- 40 C+ 85 C 
Z7D431


Varistors 430V 1250A 8.5mm
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Semitec 1455
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USD 0.21
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MOV350 VDC275 VAC845 V8.5 mm6.5 kA40 J800 pF RadialBulk Z7DPCB Mount430 V- 40 C+ 85 C 
Z15D471


Varistors 470V 4500A 16mm
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Semitec 992
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USD 0.4482
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MOV385 VDC300 VAC810 V16 mm20 kA175 J2600 pF RadialBulk Z15DPCB Mount470 V- 40 C+ 85 C 
Z15D121


Varistors 120V 4500A 16mm
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Semitec 976
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USD 0.4482
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MOV100 VDC75 VAC135 V16 mm1.25 kA42 J810 pF RadialBulk Z15DPCB Mount120 V- 40 C+ 85 C 
Z15D390


Varistors 39V 1000A 16mm
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Semitec 970
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USD 0.4124
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MOV31 VDC25 VAC465 V16 mm20 kA11 J4200 pF RadialBulk Z15DPCB Mount39 V- 40 C+ 85 C 
Z21D101


Semitec Varistors 100V 6500A 22.5mm
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Semitec 963
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USD 0.5958
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MOV85 VDC60 VAC110 V22.5 mm250 A70 J1500 pF RadialBulk Z21DPCB Mount100 V- 40 C+ 85 C 
Z15D271


Varistors 270V 4500A 16mm
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Semitec 933
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USD 0.4482
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MOV225 VDC175 VAC135 V16 mm2 kA99 J0.0115 uF RadialBulk Z15DPCB Mount270 V- 40 C+ 85 C 
Z15D241


Varistors 240V 4500A 16mm
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Semitec 833
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USD 0.4482
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 200 VDC150 VAC93 V22.5 mm2 kA84 J0.0135 uF RadialBulk Z15DPCB Mount - 40 C+ 85 C 
Z7D201


Varistors 200V 1250A 8.5mm
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Semitec 805
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USD 0.212
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MOV170 VDC130 VAC200 V8.5 mm6.5 kA17.5 J5500 pF RadialBulk Z7DPCB Mount201 V- 40 C+ 85 C 
Z10D330


Varistors 33V 500A 12.5mm
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Semitec 776
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USD 0.2932
Multiples of: 1

MOV26 VDC20 VAC675 V12.5 mm10 kA4.8 J1700 pF RadialBulk Z10DPCB Mount33 V- 40 C+ 85 C 
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