芯联微电子

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 tube 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 pulse power of the TVS tube must be greater than the peak pulse 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 tubes, multi-channel protection circuits choose TVS array devices, and high-power protection circuits choose specialized protection modules;

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