Patent ID: 6734570
Filing Date: 2004-05-11
Classification: H01L,H05K,Y02P

Abstract:
A carrier substrate for use with a flip-chip integrated circuit (IC), comprising:a substrate material; a conductive layer fabricated on the substrate material and having a plurality of circuit traces coupled to a plurality of bonding pads, wherein the bonding pads are interdigitated and arranged to correspond to input/output (I/O) pads on the flip-chip IC package; a solder mask layer fabricated over the conductive layer and defining a plurality of interdigitated, tapered pad openings that expose the bonding pads, wherein the plurality of interdigitated, tapered pad openings each have a tapered end and an expanded end with the tapered ends being interdigitated such that the tapered end of each tapered pad opening is adjacent to the tapered end of at least one other tapered pad opening; and solder bumps coupled to the bonding pads through the tapered pad openings.