Patent ID: 6213382
Filing Date: 2001-04-10
Classification: B23K,C22C,H01L

Abstract:
A method for forming a gold alloy bump, comprising the steps of:forming a ball at an end of a gold alloy wire passing through in a capillary,lowering said capillary to press and bond said ball to an electrode of an IC chip, andpulling said gold alloy wire upward to break said gold alloy wire from said ball bonded to said electrode, to thereby form a gold alloy bump on said electrode of said IC chip,wherein said gold alloy wire has a composition in which 0.2 to 5.0% by weight of palladium (Pd) and 1 to 100 ppm by weight of bismuth (Bi) are added to gold having a purity of at least 99.99% by weight.