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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.