Patent ID: 6759739
Filing Date: 2004-07-06
Classification: H01L,H05K

Abstract:
A multilayered substrate for a semiconductor device, which has a multilayered substrate body formed of a plurality of sets of a conductor layer and an insulation layer, and having a face for mounting a semiconductor element thereon and another face for external connection terminals, the face for mounting a semiconductor device being provided with pads through which the substrate is connected to a semiconductor element to be mounted thereon, and the face for external connection terminals being provided with pads through which the substrate is connected to an external electrical circuit, wherein a first reinforcing sheet is joined to the face for mounting a semiconductor element thereon and a second reinforcing sheet is joined to the face for external connection terminals of the multilayered substrate body;the second reinforcing sheet joined to the face for external connection terminals comprising through holes corresponding to the respective pads for the external connection terminals, wherein at least the inner wall surfaces of the through holes in the second reinforcing sheet joined to the face for external connection terminals are electrically insulative, and wherein each pad for the external connection terminal comprises an external connection terminal bonded thereto through the through hole.