Patent ID: 7126168

Claim:
A silicon controlled rectifier structure comprising: a semiconductor region of a first conductivity type; a semiconductor region of a second conductivity type that contacts the semiconductor region of the first conductivity type; a first region of the first conductivity type that contacts the semiconductor region of the second conductivity type and is spaced apart from the semiconductor region of the first conductivity type, the first region having a first length; a second region of the second conductivity type that contacts the semiconductor region of the second conductivity type and is spaced apart from the semiconductor region of the first conductivity type, the second region having a second length and being spaced apart from the first region, the first and second lengths being measured along substantially parallel lines, the first length being substantially longer than the second length; a first isolation section that contacts the semiconductor region of the second conductivity type and the first region; a second isolation section that contacts the semiconductor region of the second conductivity type, the first region, and the second region, the first region lying between the first and second isolation sections; and a third isolation section that contacts the first and second isolation sections and isolates the first region from the second region.