Converting from Gold to Copper Wire

In many cas­es, cus­tomers move from a 25um Au wire to a 20um Au wire to save mon­ey. In the case of Au, it’s sim­ple arith­metic, 20um is 20% cheap­er than 25um. How­ev­er, in the con­ver­sion to Cu wire, the sav­ings are already so dra­mat­ic to go from Au wire to Cu wire, and the wire sweep is so crit­i­cal dur­ing EMC qual­i­fi­ca­tions, that the cost/effort vs. ben­e­fit of going to a 20um Cu wire vs a 25um Cu wire isn’t jus­ti­fied.

There­fore, unless the I/O count is very high, most cus­tomers con­vert­ing from Au-wire to Cu-wire sim­ply con­vert from 20um Au wire to 25um Cu wire in low-pin-count devices.

On the oth­er hand, some cus­tomer don’t see any big dis­ad­van­tages of using 20um vs 25um Cu wire so they see no need to move to 25um cop­per wire first. Wiresweep is less of an issue due to the greater stiff­ness of the wire. Wire­bond­ing capa­bil­i­ty, espe­cial­ly with small­er bond­pads, 20um cop­per wire seems even bet­ter.

For more infor­ma­tion of cop­per wire bond­ing, vis­it us or

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About Chris Perabo

Chris is an energetic and enthusiastic engineer and entrepreneur. He is always interested in taking highly technical subjects and distilling these to their essence so that even the layman can understand. He loves to get into the technical details of an issue and then understand how it can be useful for specific customers and applications. Chris is currently the Director of Business Development at CAPLINQ.

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