Patent ID: 6876073

Claim:
A semiconductor device comprising: an inner cover made of a material containing silicon as the main constituent thereof, in which cover LSI chips each having a semiconductor circuit are located; an interconnection substrate made of a material containing silicon as the main constituent thereof which substrate is connected to said inner cover, said interconnection substrate being provided with cantilever electrode terminals each having a pyramid-like projection at a forward portion thereof, facing said LSI chips, which terminals are in electrical contact with said LSI chips, an interconnection layer connected to said electrode terminals, and electrode pads for performing electrical connection to outer portions which pads are connected to said interconnection layer; and an outer cover made of a metal different from silicon or a macromolecular material, wherein said pyramid-like projections are formed on a first surface of said interconnection substrate facing said LSI chips and wherein said cantilever electrode terminals are formed by grooves formed in a second surface of said interconnection substrate facing away from said LSI chips so that said grooves underlie said pyramid-like projections.