The Selection of Varistor

Apr. 13, 2022

For electronic components, the correct selection is very important. In order to help novices to quickly select the type, this article provides a guide for the selection of varistors.

Advantages of Varistor

1)A variety of surge absorption capacity: standard, high surge, ultra high surge, the physical size of the varistor determines its surge absorption capacity;

2)The wide range of variable resistance voltage is 18V-1800V, and its accuracy is usually around 10%, which can meet the application requirements of low voltage to high voltage;

3)The monomer flow can reach hundreds of amperes to tens of thousands of amperes;

4)The response speed is ns level, which is slower than TVS tube and faster than gas discharge tube;

5)Diversified sizes, various lead types: straight, bent and other special lead types;

The Selection Method of Varistor

Selection Method of Varistor:

1)The selection of varistor voltage should consider factors such as power supply voltage fluctuation, MOV voltage accuracy, and MOV aging coefficient;

2) The clamping voltage of the MOV should be less than the transient voltage that can be withstand in the subsequent stage of the protected circuit;

3) In communication circuits or low-power circuits, special attention should be paid to MOV junction capacitance and leakage current, and the normal operation of the line should not be affected;

4) MOV is an aging-type component. When applying it, considering the use environment, the number and method of test standard impacts, and refer to the derating curve of the varistor for details;

5) Package form, varistor, all plug-in components, the size is proportional to the flow rate, the larger the size, the larger the flow rate, the greater the impact current resistance, and the more reliable the circuit protection; vice versa.

You may find Dongguan Zhixu Electronic Co., Ltd. (also JYH HSU(JEC)) for plug-in varistors. JEC capacitor manufacturers have established good business relationships with many well-known integrated circuit manufacturers at home and abroad. JEC products are widely used in new energy, industrial power modules, consumer electronic products such as audio, security and other products. If you have technical questions or need samples, don't hesitate to contact us.

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