SCRs known commonly as thyristors are three-junction PNPN semiconductor devices which can be regarded as two inter-connected transistors that can be used in the switching of heavy electrical loads.
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Silicon controlled rectifier
A silicon controlled rectifier or semiconductor controlled rectifier is a four-layer solid-state current-controlling device. The name "silicon controlled rectifier" is General Electric's trade name for a type of thyristor. Wikipedia
First production: General Electric, 1957
Invented: Gordon Hall and Frank W. "Bill" Gutzwiller
Pin configuration: Anode, gate and cathode
Working principle: Ian M. Mackintosh (Bell Laboratories)