Patent ID: 8330219
Filing Date: 2012-12-11
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor substrate having a first conductivity type; a well having a second conductivity type and provided inside the semiconductor substrate; a first impurity region having the first conductivity type and provided within the well; a second impurity region having the second conductivity type, provided inside the well and away from the first impurity region, wherein the second impurity region surrounds the first impurity region; and a third impurity region having a first conductivity type, wherein the third impurity region surrounds the well and is disposed away from the second impurity region; wherein the well is formed to be deeper than the first impurity region, the second impurity region, and the third impurity region, in a thickness direction of the semiconductor substrate; and a minimum distance between the first impurity region and the second impurity region is smaller than a minimum distance between the second impurity region and the third impurity region.