Transient voltage suppressor, referred to as TVS, is a high-performance protective device in the form of diode. When the two poles of TVS diode are impacted by reverse transient high energy, it can change the high impedance between its two poles into low impedance at a speed of 10-12 seconds, absorb surge power up to several kilowatts, clamp the voltage between the two poles at a predetermined value, effectively protect the precision components in the electronic circuit from being damaged by various surge pulses.

Three characteristics of transient voltage suppressor:

1. The transient suppression diode is added to the signal and power lines to prevent the failure of the microprocessor or microcontroller caused by transient pulses, such as electrostatic discharge effect, AC power supply surge and switching power supply noise.

2. Electrostatic discharge effect can release pulses of more than 10000V and 60A for 10ms; However, normal TTL devices will be damaged when encountering 10V pulses of more than 30ms. TVS diode can effectively absorb the pulse that will cause device damage and eliminate the interference (Crosstalk) caused by switches between buses.

3. The TVS diode is placed between the signal line and the grounding to avoid unnecessary noise impact on the data and control bus.