Patent ID: 8710627

Claim:
A unidirectional transient voltage suppressor (TVS) device comprising: a) a semiconductor substrate of a first conductivity type; b) an epitaxial layer of the first conductivity type formed on the substrate; c) a first and second body regions of a second conductivity type that is opposite to the first conductivity type formed within the epitaxial layer, the first and second body regions being separated laterally by a predetermined distance; d) a set of trigger regions of the second conductivity type formed within a surface of the epitaxial layer; e) a set of source regions of the first conductivity type formed within a surface of the epitaxial layer, the trigger regions and source regions including a first source region located transversely adjacent the first body region between first and second trigger regions that are laterally adjacent the first source region and transversely adjacent the first body region, a second source region located transversely adjacent the second body region between third and fourth trigger regions that are laterally adjacent the second source region and transversely adjacent the second body region, and a third source region located laterally adjacent the fourth trigger region, wherein the fourth trigger region is between the second and third source regions; and f) an implant region of the second conductivity type located within the fourth trigger region, the implant region being laterally adjacent the third source region and having a doping concentration higher than that of the trigger region, wherein the implant region of the second conductivity type and the third source region cause a short circuit from the second body region to portions of the semiconductor substrate and the epitaxial layer of the first conductivity type.