TVS tube (silicon semiconductor)

Transient suppression diode - referred to as TVS, is a high performance protection device a diode, using reverse breakdown principle of P-N node, the static pressure pulses into the ground, so as to protect the internal components of the electrostatic sensitive electrical appliances. With the TVS diode as an example: when the instantaneous voltage exceeds the normal working voltage circuit, TVS diode is an avalanche, providing instantaneous current of a low resistance path, the result is the instantaneous current through the diode is away, away from the protected device and restore the normal value before the protected circuit has been cut-off voltage in voltage. When the instantaneous pulse is over, the TVS diode will automatically return to the high resistance state, and the whole circuit will enter the normal voltage. The failure mode of TVS pipe is short, but when the current is too large, may cause the TVS tube is open and burst. TVS tube with a one-way and two-way two, one-way TVS tube zener diode characteristics and similar characteristics of double TVS tube is equivalent to two of a zener diode reverse series, the I-V curve is shown in Figure 1, the performance parameters of map annotation:
Reverse off state voltage (cut-off voltage) VRWM and reverse leakage current IR: reverse off state voltage (cut-off voltage) VRWM indicates that the maximum voltage of TVS tube is not on, and only a small reverse leakage current is IR.
Breakdown voltage VBR:TVS tube through the specified test current IT when the voltage, which is indicative of the TVS tube voltage.
The pulse peak current of IPP:TVS tube allows the maximum peak current through the 10/1000 S wave (8/20 peak current S wave is about 5 times, the 8/20 s is defined as the IPP pulse wave current), more than the current value may cause permanent damage. In the same series, the higher the breakdown voltage of the tube allows the smaller the peak current to pass through.
The maximum clamp voltage VC:TVS voltage through the pulse peak current of IPP at both ends of the.
The pressure drop of the turn-on voltage of VF:TVS through IF mediated by forward current.
In addition to the above performance parameters, the TVS pipe has a key parameter: P-N junction capacitance Cj.


From the electronic related article:

The typical application of TVS diode in the circuit design

TVS diode selection procedures and type selection should pay attention to the problem