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With the transition from Au wire bonding to Cu wire bonding, both bare Cu wire and Pd coated Cu (PCC) wire are now commonly used. Humidity reliability is particularly challenging for Cu wire bonding. In this paper, 18 um (0.7 mil) bare Cu and PCC wire are used in the wire bonding and HAST reliability test. Various factors can influence the HAST reliability outcome. The key factors examined in this...
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