Patent ID: 6833615
Filing Date: 2004-12-21
Classification: H01L,H05K,Y02P

Abstract:
A substrate comprising:a plurality of mounting lands to mount corresponding contacts of an integrated circuit package, each land having a circular perimeter and a geometric center, wherein each land has a hollow via therein that is offset with respect to the geometric center of the land, wherein each via has a geometric center, wherein the geometric center of each via is in a region between the geometric center and the perimeter of its associated land, wherein the lands comprise a first group having vias whose geometric centers are offset in a first direction with respect to the geometric centers of the corresponding lands of the first group, wherein the lands comprise a second group having vias whose geometric centers are offset in a second direction with respect to the geometric centers of the corresponding lands of the second group, wherein the first direction is opposite to the second direction, and wherein each via comprises a via cap; and a plurality of solder balls, each solder ball adhering to a respective one of the lands, each solder ball adhering to the entire respective land.