Patent ID: 8575707

Claim:
A semiconductor device, comprising: (a) a semiconductor chip having a first main surface provided with a source electrode of a power MOSFET and a second main surface provided with a drain electrode of the power MOSFET; (b) a drift region of a first conductivity type provided in substantially the entire first main surface of the semiconductor chip; (c) a substantially rectangular active cell region provided substantially at a middle portion of the first main surface, peripheral side regions provided outside the active cell region along individual sides of the active cell region, and peripheral corner regions provided between adjacent peripheral side regions; (d) a first super-junction structure having a first orientation and provided in substantially the entire surface of the cell region and in the drift region; (e) second and third super-junction structures each having substantially the same width and orientation as those of the first super-junction structure and provided in the drift region of each of the peripheral side regions on opposite sides of the active cell region in a direction of the first orientation of the first super-junction structure so as to be coupled to the first super-junction structure; (f) fourth and fifth super-junction structures each having an orientation substantially orthogonal to that of the first super-junction structure and provided in the drift region of each of the peripheral side regions on opposite sides of the active cell region in a direction orthogonal to the first orientation of the first super-junction structure; (g) a main junction region of a second conductivity type which is at an outer end portion of the active cell region and provided in a surface of the drift region so as to surround the active cell region; and (h) a surface resurf region of the second conductivity type provided in the surface of the drift region so as to be coupled to an outer end of the main junction region and surround the main junction region, wherein, for each of the peripheral side regions, in plan view, an outer end of the surface resurf region is located at or near a middle between the outer end of the main junction region and an outer end of a peripheral super-junction region formed of the second to fifth super-junction structures.