Patent ID: 6815799
Filing Date: 2004-11-09
Classification: H01L

Abstract:
A semiconductor integrated circuit device comprising:a semiconductor substrate of one conductivity type; at least one epitaxial layer(s) of the opposite conductivity type deposited on the surface of said substrate; a opposite-conductivity-type buried layer formed between said substrate and a first epitaxial layer; a one-conductivity-type buried layer which is formed between said substrate and said first epitaxial layer and is also formed in a manner overlapping with said opposite-conductivity-type buried layer; a one-conductivity-type buried region which is connected to said one-conductivity-type buried layer and is also connected to a first one-conductivity-type diffusion region formed in an uppermost epitaxial layer; an opposite-conductivity-type buried region which is connected to said opposite-conductivity-type buried layer and is also connected to a opposite-conductivity-type diffusion region formed in said uppermost epitaxial layer; and a second opposite-conductivity-type diffusion region which is formed in said uppermost epitaxial layer in a manner surrounded by said first one-conductivity-type diffusion region, wherein a second one-conductivity-type diffusion region formed in said uppermost epitaxial layer is at least partly overlapped with said first one-conductivity-type diffusion region, and an anode electrode connects said first opposite-conductivity-type diffusion region and said second one-conductivity-type diffusion region.