Also known as transient suppression diode, it is a new type of highly efficient circuit protection device in general use, which has extremely fast response time (sub-nanosecond) and quite high surge absorption capacity. When its two ends are subjected to a transient high energy impact, TVS can change the impedance value between the two ends from high impedance to low impedance at a very high speed to absorb a transient high current, clamp the voltage at both ends of it on a predetermined value, so as to protect the circuit components behind from the impact of transient high voltage peak pulses.