Matters needing attention in TVS diode selection

Matters needing attention in 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 diode 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 diode, its peak pulse current should be greater than the transient surge current;

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

6. The influence of temperature changes on the characteristics of TVS diode should be considered. TVS diode work between -55°C and 150°C;

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

8. In the process of using TVS tubes, considering the discrete nature of TVS diode, try to reduce the number of series/parallel.