Patent ID: 7109533
Filing Date: 2006-09-19
Classification: H01L

Abstract:
1. An electrostatic discharge protection device comprising: a P conducive type first P well region formed in a P conductive type semiconductor layer of a semiconductor substrate having said P conductive type semiconductor layer having a prescribed thickness on a surface thereof; an N conductive type first N well, a periphery thereof being surrounded by said first P well region, a second N diffusion region, P conductive type first P diffusion regions, and a P conductive type third P diffusion region arranged within said first P well; and a P conductive type second P diffusion region and N conductive type first N diffusion region arranged in said first N well, wherein said second N diffusion region is arranged between said first P diffusion regions and said first N well by being opposed thereto, a first boundary side constituting a boundary between said first N well and said first P well region and opposed to said second N diffusion region includes a first recessed portion incised on a side of said first N well, wherein said second P diffusion region is arranged between said first N diffusion region and said first boundary side, said third P diffusion region is arranged between said second N diffusion region and said first boundary side such that at least a part thereof is brought into said first recessed portion, wherein said first N diffusion region is connected to a high potential side electric source, both of said second N diffusion region and said first P diffusion regions are connected to a low potential side electric source, said second P diffusion region is connected to a desired external connection electrode, and said third P diffusion region is connected to an output end of a first trigger device an input end thereof being connected to said external connection electrode.