Patent ID: 8102024

Claim:
A semiconductor integrated circuit, comprising: a diode including a first polarity-type diffusion layer which constitutes an anode of the diode and a second polarity-type diffusion layer which faces the first polarity-type diffusion layer and which constitutes a cathode of the diode; and a second polarity-type substrate or well contact which shares a diffusion layer with the second polarity-type diffusion layer constituting the cathode of the diode and which surrounds four sides of the diode, wherein: each of the first polarity-type diffusion layer and second polarity-type diffusion layer of the diode and the substrate or well contact has a plurality of contact holes for electrical connection with an external device, a portion of the substrate or well contact extending parallel to a direction in which the first polarity-type diffusion layer and the second polarity-type diffusion layer face each other has a greater separation from the first polarity-type diffusion layer or second polarity-type diffusion layer of the diode than a portion of the substrate or well contact extending perpendicular to the facing direction of the diffusion layers, and the substrate or well contact has the plurality of contact holes only in a portion extending perpendicular to the direction in which the first polarity-type diffusion layer and the second polarity-type diffusion layer face each other.