Patent ID: 6822313
Filing Date: 2004-11-23
Classification: H01L

Abstract:
A diode comprising:a semiconductor layer of a first conductive type having a first principal plane and a second principal plane facing the first principal plane; a first impurity layer of a second conductive type which is opposite to said first conductive type, said first impurity layer being selectively formed on said first principal plane of said semiconductor layer; a second impurity layer of the first conductive type which is selectively formed on said first principal plane of said semiconductor layer apart from said first impurity layer; a first main electrode connected to said first impurity layer; a second main electrode connected to said second impurity layer; a third impurity layer of the first conductive type which is selectively formed on said second principal plane of said semiconductor layer and which is formed so as to face said first impurity layer; and a fourth impurity layer of the second conductive type which is selectively formed on said second principal plane of said semiconductor layer and which is formed so as to face said second impurity layer; and short-circuit part to electrically connect said third impurity layer to said fourth impurity layer, wherein said second impurity layer has an annular structure so as to surround said first impurity layer, and said fourth impurity layer has an annular structure so as to surround said third impurity layer.