Patent ID: 6483195
Filing Date: 2002-11-19
Classification: H01L,H05K

Abstract:
A transfer bump sheet for mounting bumps for flip chip interconnection to a semiconductor chip by transferring all of said bumps at a time to said semiconductor chip, comprising:a base sheet for said transfer bump sheet, and a plurality of metal posts each provided on the base sheet, each of said metal posts being provided with a pillared metal core having a substantially uniform thickness and a solder coating provided on at least a part of said metal core, said metal core occupying a large part of each of said metal posts, said metal core of the substantially uniform thickness being provided by steps of preparing a metal foil having said substantially uniform thickness, and forming both of said metal core and said solder coating by etching said metal foil and by a plating technique, respectively, wherein said solder coating is provided on a top portion of each of the metal posts, wherein said solder coating is further provided between the metal core and the base sheet, wherein said solder coating provided between the metal core and said base sheet is made to cover a whole face of the base sheet at a side where the metal posts are located.