Patent ID: 7781338

Claim:
A method for manufacturing a semiconductor device including a semiconductor substrate, an electrode pad electrically connected to an internal circuit formed in the semiconductor substrate, an insulating film formed with a through hole reaching the electrode pad, a bedding metal layer formed over an internal surface of the through hole and the insulating film, a redistribution wiring electrically connected to the electrode pad via the bedding metal layer interposed therebetween and extended over the bedding metal layer, and a post electrode formed over the redistribution wiring, said method comprising the steps of: preparing a semiconductor wafer including the electrode pad, the insulating film formed with the through hole and the bedding metal layer which are formed in the semiconductor substrate; forming a first resist mask which exposes each area for forming the redistribution wiring, over the bedding metal layer; forming a redistribution wiring connected to the electrode pad and extending in an electrode forming area for the post electrode with the first resist mask as a mask; removing the first resist mask by a dissolving solution to expose each area excluding the electrode forming area for the redistribution wiring and forming a second resist mask disposed with being separated from each side surface of the redistribution wiring; forming a redistribution wiring protective metal film over upper and side surfaces of the exposed redistribution wiring with the second resist mask as a mask; removing the second resist mask by a dissolving solution, attaching a dry film over the semiconductor wafer and exposing the electrode forming area lying over the redistribution wiring; forming a post electrode in the electrode forming area with the dry film as a mask; removing the dry film by a removal solvent; and removing the redistribution wiring protective metal film after the removal of the dry film.