Characteristic curve of transient voltage suppressor

The circuit symbol of the transient voltage suppressor is the same as that of the common Zener diode. Its forward characteristics are the same as those of ordinary diodes. The opposite characteristic is

Typical PN junction avalanche device.

Under the action of transient peak pulse current, when the current flowing through the transient voltage suppressor rises from the original reverse leakage current ID to IR, its bipolar voltage rises from the rated reverse turn-off voltage VWM to the breakdown voltage VBR, and the transient voltage suppressor is broken down. With the appearance of the peak pulse current, the current flowing through the transient voltage suppressor reaches the peak pulse current IPP. The voltage at the two poles is clamped below a predetermined maximum clamping voltage. Then, with the exponential attenuation of the pulse current, the voltage at the two poles of the instantaneous voltage suppressor also decreases continuously, and finally returns to the initial state. This is the whole process of the transient voltage suppressor to suppress the possible surge pulse power and protect the electronic components.