Halbleiterbauelement

摘要

A pad for input/output signals is formed on a first conductive type insulated island region interposing an insulating film therebetween. The insulated island region is electrically insulated and isolated from other semiconductor regions in a semiconductor substrate. A fixed potential is provided to the insulated island region through an n+-type layer and an electrode. As a result, it is possible to prevent noise superimposed on the input/output signals from interfering in the operation of the other semiconductor regions, and to prevent noise produced in the other semiconductor regions from being superimposed on the input/output signals.