Patent ID: 9748370
Date: 2017-08-29
CPC Classifications: H01L

Claim:
1. A trench MOS semiconductor device, comprising: a first conductivity type semiconductor substrate, the first conductivity type semiconductor substrate provided with at least a first surface side, and two semiconductor element portions including: a main semiconductor element portion formed on the semiconductor substrate; and a current detection sense semiconductor element portion, connected in parallel to the main semiconductor element portion, and having an area, in a plan view, smaller than an area of the main semiconductor element, each of the two semiconductor element portions including: wherein the main semiconductor element portion includes a plurality of unit cells laid out in a checkered pattern in plan view such that in a longitudinal direction between adjacent trenches, adjacent unit cells are separated by the first conductivity-type semiconductor substrate, and such that in a width direction perpendicular to the longitudinal direction in the plan view, adjacent unit cells are separated by the first conductivity-type semiconductor substrate and by adjacent trenches sandwiching the first conductivity-type semiconductor substrate, and such that one unit cell is disposed diagonally to another adjacent unit cell, and wherein the current detection sense semiconductor element portion has a second conductivity type second channel region extending an entire width of the first surface of the semiconductor substrate between adjacent trenches, and extending an entire length of the first surface of the semiconductor substrate between adjacent unit cells in a longitudinal direction perpendicular to the width direction.