Patent ID: 8017448

Claim:
A method for manufacturing a semiconductor device, the method comprising: a) forming electrode pads to be electrically connected to electrodes of semiconductor chips on a surface of a package substrate and forming external connection pads electrically connected to the electrode pads on a back surface of the package substrate; b) laminating a metal film on the surface of the package substrate, forming a surface mask having a predetermined pattern on a surface of the metal film, the pattern being such that a plurality of pillar-shaped surface-side terminals, whose one ends are correspondingly electrically connected to the electrode pads, is formed on a peripheral portion on the surface of the package substrate, and etching the metal film to a predetermined depth using the surface mask to form pillar-shaped portions whose side surfaces are narrowed; c) repeating: i) a procedure for forming side surface masks for protecting the side surfaces of the pillar-shaped portions formed by etching; and ii) a procedure for etching the metal film to a predetermined depth using the side surface masks and the surface masks so as to form the pillar-shaped portions whose side surfaces are narrowed, until the package substrate is exposed, and removing the surface mask and the side surface mask after the package substrate is exposed, to form pillar-shaped surface-side terminals having a plurality of protruded rims formed over entire peripheries of their side surfaces along a peripheral direction; d) placing the semiconductor chips at a center of the surface of the package substrate and electrically connecting the electrodes to the electrode pads; and e) coating the surface of the package substrate with liquid resin so that the other ends of the surface-side terminals are exposed and the semiconductor chips are coated to seal the semiconductor chips with the liquid resin.