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Precautions for TVS diode selection

Precautions for TVS diode selection

 

1. It is necessary to clearly confirm the maximum DC value, rated standard voltage value, and "high-end" tolerance value of the protected circuit;

2. The maximum clamping voltage of the TVS transistor should be less than the damage voltage of the protected circuit;

3. The rated reverse turn off voltage of the  TVS diode  should be greater than or equal to the maximum working voltage of the protected circuit;

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

5. The maximum peak Pulsed power of  TVS diode  must be greater than the peak Pulsed power of the protected circuit;

6. Consider the impact of temperature changes on the characteristics of TVS tubes, which operate between -55 ° C and 150 ° C;

7. Most DC protection circuits choose unidirectional TVS tubes, most AC protection circuits choose bidirectional  TVS diode , multi-channel protection circuits choose TVS array devices, and high-power protection circuits choose specialized protection modules;

8. When using  TVS diode , consider the discreteness of  TVS diode  and minimize the number of series/parallel connections as much as possible.

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