SPLIT BALL GRID ARRAY PAD FOR MULTI-CHIP MODULES

摘要

A multi-chip module and method of fabricating a multi-chip module. The multi-chip module includes: a substrate having a top surface and a bottom surface and containing multiple wiring layers, first pads on the top surface of the substrate and second pads on the bottom surface of the substrate; a first active component attached to a first group of the first pads and a second active component attached to a second group of the first pads; wherein at least one pad of the second pads is a split pad having a first section and a non-contiguous second section separated by a gap, the first section connected by a first wire of the multiple wires to a pad of the first group of first pads and the second section is connected by a second wire of the multiple wires to a pad of the second group of first pads.

主权项

1. A multi-chip module, comprising:
a substrate having a top surface and a bottom surface and containing multiple wiring layers, each of said multiple wiring layers having multiple wires, first pads on said top surface of said substrate and second pads on said bottom surface of said substrate; a first active component attached to a first group of said first pads and a second active component attached to a second group of said first pads, wherein one pad of said second pads is a split pad having a first section and a non-contiguous second section separated by a gap, said first section connected by a first wire of said multiple wires to a pad of said first group of said first pads and said non-contiguous second section connected by a second wire of said multiple wires to a pad of said second group of said first pads, and wherein another pad of said second pads is a conventional pad having a contiguous top surface and a contiguous bottom surface; a first solder ball in direct physical contact with said contiguous bottom surface of said conventional pad and connected to a next level of packaging under said conventional pad; and a second solder ball in direct physical contact with said first and second sections of said split pad, wherein said first solder ball has a first height in a first direction and said second solder ball has a second height in said first direction, wherein said first direction is perpendicular to said contiguous bottom surface of said conventional pad, and wherein sa second height is sufficiently less than said first height such that said second solder ball is not connected to said next level of packaging.