Patent ID: 8669665
Filing Date: 2014-03-11
Classification: H01L,H05K

Abstract:
1. A flip-chip mounting substrate, comprising: a substrate main body; a connecting pad provided on the substrate main body and to which an Au bump provided on an electronic element is flip-chip bonded, the connecting pad having a wide width portion and a narrow width portion; a solder resist on the substrate main body, the solder resist having an opening portion through which only the connecting pad is exposed, wherein an edge portion of the opening portion is substantially in contact with an outer peripheral edge of the connecting pad; a solder filled in the opening portion to connect the Au bump and the wide width portion of the connecting pad, wherein the solder and the bump cooperate to fill the opening portion and cover a surface of the connecting pad; and an underfill resin filled in a gap between the electronic element and the solder resist, wherein the bump and the solder cooperate to prevent the underfill resin from flowing into the opening portion, wherein opposed edge portions of the opening portion are in flush abutment with opposed ends of the wide width portion of the connecting pad.