Patent ID: 7795741

Claim:
A semiconductor device, comprising: a wiring substrate having a front surface, a plurality of electrodes formed on the front surface, a plurality of wirings electrically connected with the plurality of electrodes, a rear surface opposed to the front surface, and a plurality of second electrodes formed on the rear surface; a first semiconductor chip having a first main surface, a plurality of first bonding pads formed on the first main surface, and a first back surface opposed to the first main surface, the first semiconductor chip being mounted over the front surface of the wiring substrate via a first insulating film having an adhesive property such that the first back surface faces to the front surface; a plurality of first bonding wires electrically connecting the plurality of first bonding pads of the first semiconductor chip with the plurality of electrodes of the wiring substrate; a second semiconductor chip having a second main surface, a plurality of second bonding pads formed on the second main surface, and a second back surface opposed to the second main surface, the second semiconductor chip being mounted over the first main surface of the first semiconductor chip via a second insulating film having an adhesive property such that the second back surface faces to the first main surface; and a plurality of second bonding wires electrically connecting the plurality of second bonding pads of the second semiconductor chip with the plurality of electrodes of the wiring substrate, wherein a planar size of the first semiconductor chip is larger than that of the second semiconductor chip in a plan view, wherein the first insulating film has a first upper surface and a first lower surface opposed to the first upper surface, wherein the second insulating film has a second upper surface and a second lower surface opposed to the second upper surface, wherein the first upper surface of the first insulating film is attached directly to the first back surface of the first semiconductor chip, wherein the first lower surface of the first insulating film is attached directly to the wiring substrate, wherein the second upper surface of the second insulating film is attached directly to the second back surface of the second semiconductor chip, wherein the second lower surface of the second insulating film is attached directly to the first semiconductor chip, and wherein a thickness of the second insulating film is larger than that of the first insulating film.