A guide from Qiaoguang Electronics that explains TVS operation, features, typical applications, naming, electrical testing, and selection considerations.
This document introduces the working principle of Transient Voltage Suppressors (TVS), describing how they protect circuits by clamping over‑voltage spikes. It covers the differences between unidirectional and bidirectional TVS, their internal structure, and key electrical characteristics such as breakdown voltage, clamping voltage, and peak pulse current.
The guide also provides practical information for engineers: typical application examples, naming conventions, detailed test methods for parameters like VRWM, VBR, IPP and IR, and important selection criteria such as maximum working voltage, power rating, clamping voltage, leakage current, junction capacitance, and package type. This manual is written in Chinese.
Unidirectional TVS is used for DC supply circuits, while bidirectional TVS is used for circuits with alternating voltage such as AC lines.
Apply the VRWM voltage across the TVS and measure the current; the measured current is the IR leakage current.