Patent ID: 6459101
Filing Date: 2002-10-01
Classification: H01L

Abstract:
The semiconductor device, in which a second-conductivity-type well is formed on a first-conductivity-type semiconductor substrate and a second-conductivity-type diffused region is formed inside said well, and in which a first-conductivity-type diffused region is formed at a desired position on said first-conductivity-type semiconductor substrate, said first-conductivity-type diffused region and said second-conductivity-type diffused region having straight portions with uniform interval, a corner part being formed at an end portion of said straight portions, said semiconductor device characterized in that:at said corner part in said second-conductivity-type diffused region, the interval between said first-conductivity-type diffused region and said second-conductivity-type diffused region is larger than the interval between said straight portions, and conductivity characteristics in a larger interval region are different from conductivity characteristics of said second-conductivity-type well along a predetermined width in order to relieve concentration of electric fields at said corner part, and a field plate is connected to a potential of the second-conductivity-type diffused region, and covers the interval region.