Patent ID: 7791142
Filing Date: 2010-09-07
Classification: H01L

Abstract:
1. An electrostatic discharge (ESD) protection diode comprising: a well formed in a semiconductor substrate of a first conductivity type; an active region formed of a second conductivity type in the well and including a plurality of first active lines extending in a first direction; second active lines extending in a second direction and connecting the first active lines; a sub-region formed of the first conductivity type and including a plurality of first sub-lines extending in the first direction, the first sub-lines being formed in the well, arranged to surround an outer region of the first active lines, and in an alternating arrangement with the first active lines; second sub-lines extending in the second direction and connecting ends of the first sub-lines extending in the first direction; a device isolation region separating the active regions and the sub-regions; a plurality of active contacts arranged in a row in the active regions; and a plurality of sub-contacts arranged in a row in the sub-region wherein a distance between the first active lines and the second sub-lines is greater than a distance between the first active lines and the first sub-lines.