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What is the thickness of nickel and gold plating for the CMM322YL and CMM321YL connectors?

April 26, 2017connectors gold nickel plating thickness

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What is the thickness of nickel and gold plating for the CMM322YL and CMM321YL connectors?

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CMM321: Contact area is copper alloy/ Ni (2 micron) + Au 1 micron Contact tail is copper alloy / Ni (2micron) + Au flash 0.1 micron CMM322: Body is copper Alloy / Ni 2 micron + Au 0.2 micron Socket boby is Beryllium Alloy / Ni 2 micron + Au 1.25 micron Nickel 2 micron is used as a barrier against migration of Au. If you put Au directly on copper that would leads to gold pollution and then to oxidation, so there will be a very bad contact resistance.