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CDCM9102: Lead Finish - NiPdAuAg

Part Number: CDCM9102

Tool/software:

I am working with part number CDCM9102RHBR

I noticed the Lead/Ball finish material is listed as NIPDAUAG This is a new finish ton me. Can you help me understanding the stackup of plating materials? Is the Ag plated over the Au and how thick are those layers?