Patent ID: 6399417
Filing Date: 2002-06-04
Classification: H01L,H05K

Abstract:
A method of fabricating a set of plated circuit lines over a BGA substrate, comprising the steps of:(1) forming a plurality of contact fingers and a plurality of electrically-conductive traces over the substrate's front surface, and a plurality of solder-ball pads over the substrate's back surface; the electrically-conductive traces being respectively connected to each of the contact fingers, while the solder-ball pads are respectively connected over a plurality of electrically-conductive vias to the electrically-conductive traces; (2) providing at least one plating bus over the substrate; (3) providing a plurality of provisional bridging lines over the substrate for interconnecting the contact fingers, the electrically-conductive traces, and the solder-ball pads together, and then connecting each integrally-connected group of the contact fingers, the electrically-conductive traces, and the solder-ball pads via a branched plating line to the plating bus; (4) performing a plating process to plate a selected plating material to the contact fingers and the solder-ball pads, during which a plating electrical current is applied via the plating bus and the branched plating lines to all of the contact fingers and the solder-ball pads; and (5) performing a drilling process to form a drilled hole into each of the provisional bridging lines so as to break all of the provisional bridging lines into open-circuited state.