| Resistance: | Standard |
|---|---|
| Function for Resistance: | Protective Resistor |
| Installation: | DIP Varistor |
| Material: | Oxide Film |
| Type: | Varistor |
| Shape: | Tube Shape |
| Samples: |
|---|
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The "varistor" is a resistive device with nonlinear volt-ampere characteristics, which is mainly used for voltage clamping when the circuit is subjected to overvoltage, absorbing excess current to protect sensitive devices. The English name is "Voltage Dependent Resistor" abbreviated as "VDR", or "Varistor". The resistance body material of the varistor is a semiconductor, so it is a variety of semiconductor resistors. Now widely used "zinc oxide" (ZnO) varistor, its main material is composed of divalent element zinc (Zn) and hexavalent element oxygen (O). So from the material point of view, zinc oxide varistor is a kind of "II-VI oxide semiconductor".
The varistor is a voltage-limiting protection device. Using the nonlinear characteristics of the varistor, when an overvoltage occurs between the two poles of the varistor, the varistor can clamp the voltage to a relatively fixed voltage value, thereby realizing the protection of the subsequent circuit. The main parameters of varistor are: varistor voltage, current capacity, junction capacitance, response time, etc.
The response time of the varistor is ns level, which is faster than the gas discharge tube and slightly slower than the TVS tube. In general, the response speed of the overvoltage protection used for electronic circuits can meet the requirements. The junction capacitance of the varistor is generally in the order of magnitude of hundreds to thousands of Pf. In many cases, it should not be directly used in the protection of high-frequency signal lines. When used in the protection of AC circuits, the large junction capacitance will increase leakage. The current needs to be fully considered when designing the protection circuit. The flow capacity of the varistor is larger, but smaller than that of the gas discharge tube. Varistor, referred to as VDR, is a non-linear overvoltage protection semiconductor component that is sensitive to voltage.
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advantage:
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