Patent ID: 7638857

Claim:
A structure of a silicon controlled rectifier, comprising: a substrate, having a first conductive type; a well region, formed within the substrate, having a second conductive type; a first dopant region, formed within the substrate and the well region, and having the first conductive type; a second dopant region, formed within the substrate and a portion of the well region, and having the second conductive type; a third dopant region, formed under the second dopant region and having the first conductive type, wherein the second and the third regions forms a vertical Zener diode; a fourth dopant region, formed within the substrate and separated from the second dopant region, having the second conductive type; and a fifth dopant region, formed within the substrate in a manner that the fourth dopant region is between the second dopant region and the fifth dopant region, and having the first conductive type, wherein the second dopant region is between the first dopant region and the fourth dopant region.