Precautions for TVS diode selection

Precautions for TVS diode selection

How to select TVS diodes in electronic circuit applications and what precautions should be taken?

1、 To clearly confirm the maximum DC value, rated standard voltage value, and "high-end" tolerance value of the protected circuit;

2、 The rated reverse turn off voltage of TVS tube should be greater than or equal to the maximum operating voltage of the protected circuit;

3、 The maximum clamping voltage of TVS tube should be less than the damage voltage of the protected circuit;

4、 The maximum peak pulse power of TVS tube must be greater than the peak pulse power of the protected circuit;

5、 After determining the maximum clamping voltage of the TVS tube, its peak pulse current should be greater than the transient surge current;

6、 DC protection circuits mostly choose unidirectional TVS tubes, AC protection circuits mostly choose bidirectional TVS tubes, multi-channel protection circuits choose TVS array devices, and high-power protection circuits choose dedicated protection modules;

7、 To consider the impact of temperature changes on the characteristics of TVS tubes, TVS tubes operate between -55 ° C and 150 ° C

8、 In the process of using TVS tubes, considering the discreteness of TVS, try to minimize the number of series/parallel connections.