IGBT ? Working, Types, Structure, Operation & Applications Thyristors are the most used components in modern electronics and logic circuits are used for switching and amplification. BJT and MOSFET are the most used types of the transistor where each of them has its own advantage over the other and some limitations. The IGBT (Insulated Gate Bipolar Transistor) takes the best parts of both BJT and MOSFET into a single transistor. It takes the input characteristics (high input impedance) of MOSFET (Insulated Gate) and the output characteristics of BJT (Bipolar nature).