Patent ID: 8278706

Claim:
A semiconductor device including a semiconductor layer having a single-crystalline structure, comprising: a first semiconductor element portion including a first channel surface having a first plane orientation, for switching a first current, said first semiconductor element portion including a first region of said semiconductor layer including a first trench having said first channel surface, a first gate insulating film covering said first channel surface with a first thickness, and a first gate electrode provided on said first gate insulating film to fill said first trench, for applying an electric field to said first channel surface; and a second semiconductor element portion including a second channel surface having a second plane orientation different from said first plane orientation, for switching a second current smaller than said first current, said second semiconductor element portion including a second region of said semiconductor layer including a second trench having said second channel surface, a second gate insulating film covering said second channel surface with a second thickness larger than said first thickness, and a second gate electrode provided on said second gate insulating film to fill said second trench, for applying an electric field to said second channel surface.