Patent ID: 6373139
Filing Date: 2002-04-16
Classification: H01L

Abstract:
A ball grid array device, comprising:a substrate having a plurality of edge margins; a plurality of solder ball pads located on the substrate; a plurality of interconnection vias electrically coupled one each to a corresponding one of the plurality of solder ball pads; and the substrate is divided into four uniformly aligned quadrants (1st, 2nd, 3rd and 4th quadrants) by an X-axis and a Y-axis that intersect at the middle of the substrate and that are orthogonal to each other, and each one of the plurality of solder ball pads and their corresponding interconnection vias form pairs and the pairs are laid out uniformly along a plurality of lines which are at 45 degree angles to either the X or Y axes, and each one of the plurality of interconnection vias is located closer to the edge margins than its corresponding solder ball pad such that a gap is formed between each quadrant to facilitate placement of a plurality of interconnection traces.