Patent ID: 7135751

Claim:
A semiconductor device comprising: a supporting substrate; an insulator layer layered on the supporting substrate; a semiconductor layer layered on the insulator layer; a high breakdown voltage junction terminating structure having a RESURF (reduced surface field) structure formed in a loop-like shape on a surface region of the semiconductor layer; a power element formed in a region surrounded by the high breakdown voltage junction terminating structure; a driving unit for the power element formed in the region surrounded by the high breakdown voltage junction terminating structure; an insulation region surrounding the power element in the region surrounded by the high breakdown voltage junction terminating structure and penetrating through the semiconductor layer to reach the insulator layer; a level shift element having an input electrode, in which a voltage before level shift is applied, and an output electrode, to which a voltage after level shift is applied, the input electrode being disposed on one side of the high breakdown voltage junction terminating structure and the output electrode being disposed on the other side of the high breakdown voltage junction terminating structure with the high breakdown voltage junction terminating structure positioned between the input electrode and the output electrode; a wire electrically connecting the output electrode of the level shift element and the driving unit; and an interlayer insulator film provided between the semiconductor layer and the wire wherein the power element comprises one of an insulated gate bipolar transistor and a diode.