Patent ID: 6388295
Filing Date: 2002-05-14
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor layer of a first conductivity type; a first impurity region of a second conductivity type formed at a main surface of said semiconductor layer and having a first impurity concentration peak; a second impurity region of the first conductivity type formed at the main surface of said semiconductor layer, located within a planar region provided with said first impurity region, and having a second impurity concentration peak at a smaller depth than said first impurity concentration peak; a third impurity region of the second conductivity type formed at the main surface of said semiconductor layer, located within the planar region provided with said first impurity region, surrounding said second impurity region, and having a third impurity concentration peak at a smaller depth than the first impurity concentration peak; a fourth impurity region of the second conductivity type formed at the main surface of said semiconductor layer, located in a region spaced from said first impurity region, and having a fourth impurity concentration peak; a fifth impurity region of the first conductivity type formed at the main surface of said semiconductor layer, located within a planar region provided with said fourth impurity region, and having a fifth impurity concentration peak at a smaller depth than said second and fourth impurity concentration peaks; a sixth impurity region of the second conductivity type formed at the main surface of said semiconductor layer, located within a planar region provided with said fourth impurity region, surrounding said fifth impurity region and having a sixth impurity concentration peak at a smaller depth than the fourth impurity concentration peak; a first field-effect element of the second conductivity type formed at the main surface of said second impurity region; and a second field-effect element of the second conductivity type formed at the main surface of said fifth impurity region.