Patent ID: 7763950

Claim:
A semiconductor device in which a high-withstand semiconductor device and logic circuits are integrated on a single chip, comprising: said high-withstand voltage semiconductor device having a rectangular shape and having an oxide film and an epitaxial layer on a support substrate; a high-potential-side logic circuit connected to a high-potential-side electrode of said high-withstand voltage semiconductor device, which is arranged near a side of the high-withstand voltage semiconductor device having a rectangular shape near a high-potential island; a low-potential-side logic circuit that outputs control signals for controlling the driving of said high-withstand voltage semiconductor device; a multi-trench separation region that separates the high-potential island including said high-potential-side logic circuit, and that is formed of multiply overlaid trench separation regions biased by using capacitance couplings between the multiply overlaid trench separation regions, and the high-potential-side electrode and a low-potential-side electrode arranged at two opposed side ends of said high-withstand voltage semiconductor device having the rectangular shape, are surrounded by at least a trench separation region of said multi-trench separation region; and a metal wire electrically connecting said high-potential-side logic circuit to the high-potential-side electrode of said high-withstand voltage semiconductor device, and wherein the high-potential-side electrode in the high-withstand voltage semiconductor device lies between regions which are biased by using the capacitance couplings so as to have a high potential in the multi-trench separation region.