In the actual application circuit, the damage of the instantaneous pulse to the device can not be ignored. How to protect the precision components of the post-circuit from the harm of instantaneous pulses? This requires the use of transient voltage suppressors (also known as transient suppression diodes, TVS, TVS diodes), TVS on the circuit board and the protected line in parallel. When the instantaneous voltage exceeds the operating voltage in the circuit, the TVS avalanche breakdown, giving the instantaneous current a low impedance path; When the instantaneous pulse is over, the TVS automatically restores the high impedance state, and the entire circuit returns to the normal voltage state.