A transistor is a semiconductor device used to amplify or switch electrical signals and power. It is composed of semiconductor material, usually with at least three terminals for connection to an electronic circuit. A voltage or current applied to the transistor's terminals controls the current through the terminals. Because the controlled output power can be higher than the controlling input power, a transistor can amplify a signal. Standard transistors are offered in single pakages, but many are found embedded in integrated circuits. Transistors are one of the key active components in modern electronics.
In addition to metal-oxide-semiconductor field-effect transistors (MOSFETs), the manufacturer ERIS also offers a family of thyristors that includes silicon-controlled rectifiers (SCRs), TRIACs, thyristor surge protection devices/thyristor surge supressors (TSPD/TSS) & silicon diodes for alternating current (SIDACs).