Patent ID: 8153516
Filing Date: 2012-04-10
Classification: H01L,H05K,Y02P

Abstract:
1. A method of making a BGA solder ball interconnection to an outer conductive layer of a laminated circuit assembly, comprising the steps of: laminating an outer conductive layer having a thickness of at least about 75 microns over an insulating layer covering an underlying circuit layer; selectively removing portions of the outer conductive layer around a region of the outer conductive layer to define a raised pad having a plurality of vertical conductive walls at least about 75 microns high, the vertical walls being spaced apart from conductive material not intended to be connected and wherein the raised pad is formed non-contiguously with a portion of an outer conductive layer serving as a power plane for a chip; and adhering a BGA solder ball having an average diameter greater than the width of the raised face to the raised face.