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80 wt.% Au, 20 wt.% Sn solder is used in optoelectronics because it allows soldering in fluxless processes. Au-Sn solder is also applied in the field of RF and MEMS packaging. Normally the deposited solders are re-flowed after electroplating but it is also possible to use the bumps in the as-deposited condition. Au-Sn solder which has been reflowed consists of an Au pedestal with a eutectic solder...
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