Patent ID: 6342728
Filing Date: 2002-01-29
Classification: H01L,Y10T

Abstract:
A semiconductor device comprising:a semiconductor chip having semiconductor elements and external terminals formed on a main surface thereof; a wiring substrate formed over the main surface of the semiconductor chip and comprising an insulating substrate base, bump lands, wirings electrically connected to the bump lands, and bump electrodes respectively formed on the bump lands; an elastic layer formed between the wiring substrate and the semiconductor chip, wherein the wiring substrate has an opening formed over the external terminals and the elastic layer does not extend over the external terminals; and flexible leads electrically connecting respective wirings at the edge of the opening with corresponding ones of the external terminals, wherein the elastic layer has an end surface at the side of the opening of the wiring substrate which is recessed from the edge of the opening in a direction away from the external terminals, and wherein the width of each flexible lead on an external terminal is at least as wide as the width thereof at the edge of the opening.