Patent ID: 8363403
Filing Date: 2013-01-29
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor module including a first semiconductor chip configuring an upper arm and a second semiconductor chip configuring a lower arm, each having a front surface side and a back surface side, and each in which a semiconductor power element is formed, a first heat sink disposed on the back surface side of the first semiconductor chip, a second heat sink disposed on the front surface side of the first semiconductor chip and the back surface side of the second semiconductor chip, a third heat sink disposed on the front surface side of the second semiconductor chip, and a resin sealing section that seals the first and second semiconductor chips and the first to third heat sinks, in which the surfaces of the first to third heat sinks on the side opposite of the first and second semiconductor chips serve as heat radiating surfaces and are exposed from the resin sealing section; and a cooling mechanism including a coolant passage through which a coolant flows, that comes into contact with the heat radiating surfaces of the first to third heat sinks exposed from the resin sealing section by sandwiching the semiconductor module, and cools the first and second semiconductor chips included in the semiconductor module, wherein of the upper arm and the lower arm, the arm with a greater combined value of thermal resistances from the first or second semiconductor chip to the heat radiating surfaces of the first to third heat sinks is disposed on an upstream side of the coolant flow flowing through the coolant passage, and the arm with the smaller combined value of the thermal resistances is disposed on a downstream side.