Patent ID: 8508517
Filing Date: 2013-08-13
Classification: H01L

Abstract:
1. An electrostatic protection element comprising: a substrate of a first conductivity type; a first low-concentration diffusion region of a second conductivity type and a second low-concentration diffusion region of the first conductivity type which are formed on said substrate, the second conductivity type being different from the first conductivity type; a first high-concentration diffusion region of the second conductivity type and a second high-concentration diffusion region of the first conductivity type which are (i) formed in said first low-concentration diffusion region, and (ii) electrically connected with each other; a third high-concentration diffusion region of the first conductivity type and a fourth high-concentration diffusion region of the second conductivity type which are (i) formed in said second low-concentration diffusion region, and (ii) electrically connected with each other; a fifth high-concentration diffusion region of the first conductivity type formed in said first low-concentration diffusion region; a sixth high-concentration diffusion region of the second conductivity type formed in said second low-concentration diffusion region; and a seventh high-concentration diffusion region which (i) is formed in one of said first low-concentration diffusion region and said second low-concentration diffusion region, and (ii) has a conductivity type different from the conductivity type of one of said first low-concentration diffusion region and said second low-concentration diffusion region in which said seventh high-concentration diffusion region is formed, wherein said seventh high-concentration diffusion region is electrically connected with one of said second high-concentration diffusion region and said fourth high-concentration diffusion region whichever having the conductivity type different from the conductivity type of said seventh high-concentration diffusion region.