Semiconductor device with improved control circuit pattern placement

A semiconductor device, comprising:

• first and second semiconductor chips;
• a cooling base board that is rectangular in a plan view of the semiconductor device, and has a first side, a second side, a third side and a fourth side in this order;
• and
• an insulated circuit substrate disposed on a front surface of the cooling base board so as to straddle a center line of the cooling base board that passes through a center of the cooling base board in a direction parallel to the first side and the third side, the insulated circuit substrate including an insulating plate and further including, on a front surface of the insulating plate, a high potential circuit pattern on which the first semiconductor chip is mounted, an intermediate potential circuit pattern on which the second semiconductor chip is mounted, a low potential circuit pattern, and a control circuit pattern, wherein
• the high potential circuit pattern includes a first chip mounting region adjacent to the center line at a side of the center line where the first side is located, the first chip mounting region having the first semiconductor chip mounted thereon,
• the intermediate potential circuit pattern includes:
• a second chip mounting region adjacent to the center line on a side of the center line where the third side is located, the second chip mounting region having the second semiconductor chip mounted thereon;
• an output wiring connection region facing the second chip mounting region;
• and
• an interconnect wiring region disposed so as to straddle the center line and connect the second chip mounting region and the output wiring connection region,
• the second chip mounting region, the output wiring connection region and the interconnect wiring region forming a U-shaped portion in the plan view with an opening facing the fourth side, the U-shaped portion partially surrounding at least a part of the first chip mounting region, and
• the control circuit pattern is disposed so as to straddle the center line and faces the opening of the U-shaped portion.