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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 Basics. In many ways the Silicon Controlled Rectifier, or the Thyristor as it is more commonly known, is similar to the transistor. It 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.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.