four-layer device
four-layer device
[¦fȯr ¦lā·ər di′vīs] (electronics)
A pnpn semiconductor device, such as a silicon controlled rectifier, that has four layers of alternating p-and n-type material to give three pn junctions.
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Solid-state crosspoint arrays were first fabricated in 1967 although the use of solid-state four-layer devices (a pnpn transistor switch, for talking-path switching) had been suggested at Bell Labs in 1956.
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