• noun a semiconductor device with three electrodes in which a signal to one electrode causes an independent current to flow between the other two
  • A solid-state equivalent of a thyratron. Examples includes SCRs, and three-layer diodes.
  • A semiconductor device with four layers, p-n-p-n, which has an input terminal, or gate, output terminal, or anode, and a terminal common to both called cathode. Used, for instance, as a solid-state switch that turns large amounts of power on and off very quickly. Also called SCR (1).

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