Patent ID: 6894351
Filing Date: 2005-05-17
Classification: H01L

Abstract:
1. A semiconductor device for use with an external element, comprising: a connection terminal for connection with the external element, and two protection circuits substantially symmetrically disposed about the connection terminal, each protection circuit comprising: a dielectric substrate having a semiconductor layer formed thereon; a first region of a first conductive type that is formed in the semiconductor layer and electrically connected to the connection terminal by a first silicide layer formed on the semiconductor layer; a second region of a second conductive type that is formed in the semiconductor layer and electrically connected to the first region; a second silicide layer formed above a boundary between the first region and the second region, the second silicide layer being in direct contact with the first and second regions and being separated from the first silicide layer; a third region of the first conductive type that is formed adjacent to the second region in the semiconductor layer; a fourth region of the second conductive type that is formed adjacent to the third region in the semiconductor layer; and a gate electrode formed over the third region through a dielectric film, wherein each of the first through fourth regions extends from a top surface of the semiconductor layer to a bottom surface of the semiconductor layer.