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Definition of "PNPN Device" |
A four layer semiconductor. See Thyristor Terms. / The two-layer semiconductor diode has led to three-, four, and even five-layer devices. A family of four-layer pnpn devices will first be considered: the SCR silicon-controlled rectifier, the SCS silicon-controlled switch, the GTO gate turn-off switch, the LASCR light-activated SCR, and then an increasingly important device the UJT unijunction transistor. Those four-layer devices with a control mechanism are commonly referred to as thyristors, although the term is most frequently applied to the SCR. / Cordless telephony standard that was used in the early 1990s to provide short-range proto-mobile phone service in some countries in Europe. |
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