Patent ID: 6559481
Filing Date: 2003-05-06
Classification: H01L

Abstract:
A semiconductor device comprising: a first conductivity type of semiconductor substrate; a first conductivity type of cathode region formed on the lower side of the semiconductor substrate and having a cathode electrode formed on the lower surface of itself; a second conductivity type of first anode region formed to partially constitute the upper surface of the semiconductor substrate and having an anode electrode formed on the upper surface of itself; a peripheral region, formed to surround the first anode region, for assuring withstand voltage characteristics which are equal to or better than predetermined withstand voltage characteristics; and a marginal region formed to surround the peripheral region, characterized in that:at least one second anode region is formed in the first anode region such that the second anode region is electrically isolated from the first anode region, and an electrode being independent of the anode electrode on the first anode region is formed on the upper surface of the second anode region.