Patent ID: 9741843
Date: 2017-08-22
CPC Classifications: H01L

Claim:
1. A semiconductor device, comprising: a semiconductor substrate; a main element provided on the semiconductor substrate and having a first trench gate structure including a first trench disposed on a first main surface side of the semiconductor substrate; a gate insulating film disposed along an inner wall of the first trench; and a gate electrode disposed inside the first trench; and a current detecting element for detecting a current flowing into the semiconductor substrate when the main element is operating provided on the semiconductor substrate side-by-side with the main element and having a second trench gate structure including a second trench disposed on the first main surface side of the semiconductor substrate; the gate insulating film disposed along an inner wall of the second trench; and the gate electrode disposed inside the second trench, wherein the first trench constituting the first trench gate structure of the main element and the second trench constituting the second trench gate structure of the current detecting element have respective widths, and the width of the second trench is less than the width of the first trench.