Patent ID: 8779603

Claim:
A stacked semiconductor device, comprising: a first semiconductor package including: a first wiring substrate; a first semiconductor element mounted on the first wiring substrate; and multiple first connection terminals formed on a surface of the first wiring substrate; a second semiconductor package including: a second wiring substrate; a second semiconductor element mounted on the second wiring substrate; and multiple second connection terminals formed on a surface of the second wiring substrate, the second semiconductor package being disposed so as to be stacked on the first semiconductor package via the multiple second connection terminals; and a heat dissipating member, which is disposed between the first semiconductor package and the second semiconductor package, is in thermal contact with both the first semiconductor package and the second semiconductor package, has openings formed therein at locations corresponding to the multiple second connection terminals so as not to be in contact with the multiple second connection terminals, and is formed so as to hang over outer peripheral portions of the first semiconductor package and the second semiconductor package, wherein the heat dissipating member is brought into surface contact with the corresponding wiring substrate of one semiconductor package of the pair of the first semiconductor package and the second semiconductor package and is brought into surface contact with the corresponding semiconductor element of another semiconductor package thereof, and wherein the multiple first connection terminals and the multiple second connection terminals comprise ball electrodes, and the heat dissipating member openings are each formed in a tapered shape which gradually widens from the second semiconductor package side toward the first semiconductor package side.