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The thyristor is a four-layered, three terminal semiconductor device, with each layer consisting of alternately N-type or P-type material, for example P-N-P-N.n earlier gas filled tube device called a thyratron provided a similar electronic switching capability, where a small control voltage could switch a large current. It is from a combination of thyratron and  transistor  that the term thyristor is derived.
Thyristor. Introduction: Thyristor is a three terminal device with four layers of alternating P and N type material (three P-N junctions). The three terminals are Anode, Cathode and Gate.1  The Thyristor is mentioned as Silicon Controlled Rectifier (SCR) as it is made up of silicon and working as controlled rectifier.he thyristor has a unique four layer construction of alternating P-type and N-type regions. It is given below: The SCR looks like two PNP transistor connected in a back to back manner. It can be understood with the reference of above figure.