Patent ID: 7332748

Claim:
An electro-static discharge protection device comprising: a first conductive type layer or a first conductive type substrate; a first conductive type well and a second conductive type well which are arranged adjacent to each other in a surface of said first conductive type substrate or said first conductive type layer; a first high concentration first conductive type region and a first high concentration second conductive type region which are formed in a surface of said second conductive type well; and a second high concentration first conductive type region and a second high concentration second conductive type region which are formed in a surface of said first conductive type well, wherein: said first high concentration first conductive type region is connected with a first power supply of a potential, said second high concentration second conductive type region and said second high concentration first conductive type region are connected with a second power supply of a potential different from the potential of said first power supply, said first high concentration second conductive type region is connected with a trigger current supply circuit, said first high concentration first conductive type region is separated into a plurality of divisional regions which are arranged in a direction orthogonal to a direction of arrangement of said second high concentration second conductive type region and said second high concentration first conductive type region, and said first high concentration second conductive type region extends between every two of said plurality of divisional regions.