Transistors were considered the invention of the twentieth century that changed electronic circuits forever. A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power.

TransistorsBipolar junction transistor (BJT, or simply "transistor") – NPN or PNP

Photo transistor – Amplified photodetector

Darlington transistor – NPN or PNP

Photo Darlington – Amplified photodetector

Sziklai pair (Compound transistor, complementary Darlington)

Field-effect transistor (FET)

JFET (Junction Field-Effect Transistor) – N-CHANNEL or P-CHANNEL

MOSFET (Metal Oxide Semiconductor FET) – N-CHANNEL or P-CHANNEL

MESFET (MEtal Semiconductor FET)

HEMT (High electron mobility transistor)


Silicon-controlled rectifier (SCR) – Passes current only after triggered by a sufficient control voltage on its gate

TRIAC (TRIode for Alternating Current) – Bidirectional SCR

Unijunction transistor (UJT)

Programmable Unijunction transistor (PUT)

SIT (Static induction transistor)

SITh (Static induction thyristor)

Composite transistors

IGBT (Insulated-gate bipolar transistor)

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