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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.
However, unlike the diode which is a two layer (P-N) semiconductor device, or the transistor which is a three layer (P-N-P, or N-P-N) device, the Thyristor is a four layer (P-N-P-N) semiconductor device that contains three PN junctions in series, and is represented by the symbol as shown.t is a multi-layer semiconductor device, hence the âsiliconâ part of its name. It requires a gate signal to turn it âONâ, the âcontrolledâ part of the name and once âONâ it behaves like a rectifying diode, the ârectifierâ part of the name.