What Is A Thyristor (SCR)? How Do They Work, Their Types & Applications

What Is A Thyristor (SCR)? How Do They Work, Their Types & Applications

A thyristor is a solid-state semiconductor switching device. It is a bistable switch that operates in two stable states; non-conducting and conducting state. They are said to be an ideal switch but practically they have some limitations based on their characteristics. They are mostly used in high power circuits.

It is a four-layer PNPN semiconductor switching device with three P-N junctions. It has three terminals; the two main terminals Anode and Cathode & the control terminal called gate.

Symbol

The symbol of thyristor resembles diode because both of them allow current flow in one direction except thyristors are controlled by external gate input.
Thyristor Symbol

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