Patent ID: 7816754
Filing Date: 2010-10-19
Classification: H01L,H05K,Y02P

Abstract:
1. A BGA solder ball interconnection to an outer conductive layer of a laminated circuit assembly, comprising: an underlying circuit layer having a connection surface adapted for face to face operative connection of an integrated circuit chip, an insulating layer over the underlying circuit, an outer conductive layer over the insulating layer and above the connection surface and including at least one outer conductive layer vertical wall and a raised BGA solder ball pad substantially co-planar with the outer conductive layer, said BGA solder ball pad having a raised face and vertical conductive pad walls spaced from the at least one outer conductive layer vertical wall, the raised face being raised above the connection surface of the underlying circuit layer a substantial height, and a BGA solder ball adhered to the raised face and a substantial portion of the outer vertical conductive walls, a solder mask layer at a lower portion of raised pad formed to provide an insulating layer upon the outer conductive layer vertical wall and occupying at least a portion of a space between the outer conductive layer vertical wall and the raised BGA solder ball pad, the BGA solder ball being supported, at least in part, by the solder mask layer, and wherein said BGA solder ball has an average diameter of greater than the width of the raised face.