Patent ID: 7838937

Claim:
A circuit, comprising: an output driver transistor; and a distinct device configured to provide electrostatic discharge (ESD) protection for the output driver transistor, wherein the distinct device comprises: a single ESD protection transistor with an extended drain contact region; a silicon controlled rectifier (SCR) comprising: a first terminal spaced apart from the extended drain contact region of the ESD protection transistor, wherein the first terminal is enveloped within a first terminal well region, the first terminal well region comprising a well edge disposed between the first terminal and the extended drain contact region such that the extended drain contact region is laterally spaced apart from the first terminal well region; and a second terminal dually serving as a source contact region of the ESD protection transistor; an ohmic contact region spaced apart from the first terminal of the SCR; and a collection region arranged adjacent to the second terminal of the SCR, wherein the extended drain contact region is disposed within a second well region of the same conductivity type as both of the extended drain contact region and the first terminal well region, the second well region having a comparatively lower net concentration of electrically active components than the first terminal well region, and wherein the source contact region is disposed within a doped region of opposite conductivity type than the source contact region.