Patent ID: 7217980

Claim:
An electrostatic discharge protection device, including a silicon-control-rectifier, in complementary metal-oxide semiconductor process, said device comprising: a semiconductor substrate having a first conductivity type; a well region formed in said semiconductor substrate, said well region being of a second conductivity type which is different from said first conductivity type; a first region formed in said well region, said first region being of said second conductivity type; a second region formed having a portion in said well region and another portion outside said well region, but still within said semiconductor substrate, said second region being of said second conductivity type; a third region formed within said well region and in between said first region and said second region, said third region being of said first conductivity type; a first contact on said device coupled to said first region and said third region, and connected to an input/output pad; a fourth region formed within said semiconductor substrate and outside said well region, said fourth region being of said second conductivity type; a fifth region formed within said semiconductor substrate and in between said second region and said fourth region, said fifth region being of said first conductivity type wherein said second and fifth regions form the n + -p + junction of a zener diode; and a second contact on said device coupled to said fourth region and in electrical contact with said fifth region, and connected to a Vss source, wherein said fifth regions is part of said zener diode and part of said second contact simultaneously.