Patent ID: 8772940

Claim:
A semiconductor device comprising: a semiconductor substrate; a first well of a first conductivity type provided on the semiconductor substrate; a first transistor provided in the first well; a first contact diffusion layer provided in the first well so as to be electrically connected to the first well, the first contact diffusion layer extending in a channel width direction of the first transistor; a second contact diffusion layer provided in the first well so as to be electrically connected to the first well, the second contact diffusion layer extending in a channel length direction of the first transistor; a first contact provided on the first contact diffusion layer, the first contact having a shape with a diameter in the channel width direction larger than a diameter in the channel length direction when the first contact is viewed from above the semiconductor substrate; a second contact provided on the second contact diffusion layer, the second contact having a shape with a diameter in the channel width direction smaller than that of the first contact and a diameter in the channel length direction almost equal to that of the first contact when the second contact is viewed from above the semiconductor substrate; and a wiring electrically connected to at least a part of the first transistor through the second contact.