Patent ID: 6495397
Filing Date: 2002-12-17
Classification: H01L,H05K,Y02P,Y10T

Abstract:
A method comprising:aligning a substrate with a corresponding chip, the substrate having opposing a first and second substrate surfaces, the first substrate surface having a plurality of solder bumps attached thereto, the solder bumps having a melting temperature, the chip having opposing first and second chip surfaces, the first chip surface having metal protrusions attached thereto, the metal protrusions at least partially covered with a metal cap, the metal protrusions primarily comprising a first metal and the metal cap primarily comprising a second metal; bringing the plurality of solder bumps and the plurality of bump metal protrusions in contact with each other; and heating the plurality of solder bumps to a first temperature greater than the melting temperature to melt the plurality of solder bumps.