What material is thyristor composed of and is it a transistor

A P1N1P2N2 four layer three terminal device based on silicon single crystal, created in 1957. Due to its characteristics similar to vacuum thyristors, it is internationally known as silicon crystal thyristors, abbreviated as thyristor T. Due to its initial application in controllable rectification, thyristor is also known as silicon controlled rectifier component, abbreviated as thyristor SCR. In terms of performance, thyristors not only have unidirectional conductivity, but also possess more valuable controllability than silicon rectifier components (commonly known as "dead silicon"). It only has two states: on and off.

Controllable silicon, abbreviated as SCR, is a high-power electrical component, also known as thyristor. It has the advantages of small size, high efficiency, and long lifespan. In automatic control systems, it can be used as a high-power driving device to control high-power equipment with low-power controls. It has been widely used in AC/DC motor speed control systems, power regulation systems, and servo systems. There are two types of thyristors: unidirectional thyristors and bidirectional thyristors.

Is thyristor a transistor?

A thyristor is not a transistor. Although it also has three legs, the working principle is different. Once the control electrode of the thyristor receives a positive polarity voltage signal of several volts, it will instantly turn on the other two electrodes of the thyristor. It can be used as a diode for rectification and controllable rectification, and the material is silicon.