Copper Pillar Bump

Copper Pillar Bump

Like in conventional fabrication, integrated circuits are created on the wafer but near the end of the manufacturing process, the attachment pads are metalized on the surface of the chips to make them more receptive to solder. Then solder dots are deposited on each of the pads, and chips are cut, flipped, and positioned so that the solder balls are facing the connectors on the external circuitry.

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