Abstract: A semiconductor substrate having a body and a plurality of finger pads formed thereon is disclosed. Each of the finger pads includes two expanding portions respectively and a connecting portion formed therebetween. The finger pads are alternately arranged on the body in a manner that one of the expanding portions of one of the finger pads is disposed in position corresponding to the connecting portion of an adjacent one of the finger pads, so as to reduce pitches between the finger pads horizontally and vertically, provide sufficient spaces for wire bonding, and prevent a wire bonder from mistakenly recognizing a lead trace coupled to the finger pad as another finger pad.

Abstract: A method is proposed for the fabrication of plated circuit lines, including contact fingers, electrically-conductive traces, and solder-ball pads, over an BGA (Ball Grid Array) substrate. The method is characterized by that contact fingers, electrically-conductive traces, and solder-ball pads on the BGA substrate are interconnected with provisional bridging lines; and then, each integrally-connected group of the contact fingers, the electrically-conductive traces, and the solder-ball pads is connected via a branched plating line to a common plating bus. During plating process, the plating electrical current can be applied to the plating bus and then distributed over these branched plating lines to all of the contact fingers and the solder-ball pads. Finally, a drilling process is performed to break all the provisional bridging lines into open-circuited state.