US Patent 9064846 Semiconductor device

A semiconductor device includes a semiconductor element, a base plate having an upper surface on which the semiconductor element is mounted, a cooling fin disposed on a lower surface of the base plate, a jacket disposed in a sealing manner on the lower surface of the base plate, the jacket surrounding the cooling fin, and a header partition wall formed separately from the jacket and fixed to the jacket on the lower side of the cooling fin in the jacket, the header partition wall forming a header and a flow path for causing a refrigerant flow to the cooling fin.