Patent ID: 7671465

Claim:
A power semiconductor module comprising: a power semiconductor element; a lower-side electrode connected to a lower side of the power semiconductor element; a first insulating substrate connected to a lower side of the lower-side electrode and having metallic foils bonded on opposing major surfaces thereof; an upper-side electrode connected to an upper side of the power semiconductor element; a second insulating substrate connected to an upper side of the upper-side electrode and having metallic foils bonded onto opposing major surfaces thereof; a first heat spreader connected via a first solder to a lower side of the first insulating substrate; a second heat spreader connected via a second solder to an upper side of the second insulating substrate; a first heat sink connected via a third solder to a lower side of the first heat spreader and adjacent with a cooling medium; a second heat sink connected via a fourth solder to an upper side of the second heat spreader and adjacent with the cooling medium, wherein the power semiconductor element, the first insulating substrate, the second insulating substrate, the first heat spreader and the second heat spreader are sealed with resin such that the resin is in contact with surfaces of the first and second heat spreaders, and wherein the first and second heat spreaders include dimples formed in the surfaces thereof that contact the resin to prevent delamination of the resin from said surfaces.