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Pcb surface finish question

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Regnum

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Hello,

What is best PCB surface finish for pads that will be directly connected to ring terminals using screw/washer/nut ?


The PCB assembly must be suitable for working in medium-high moisture environments, but terminals won't be removed and put back unless the PCBA has to be replaced (I hope never).

So, should I pick HASL, Immersion Silver, Immersion Gold over immersion Silver, Electroplated Gold over Immersion Silver, Electroplated Gold over Electroplated Nickel, Electroless Nickel Immersion Gold.... or what else?

Thanks,
Daniel
 

marce

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What other technology is on the board, SMD? What soldering process leaded or lead free? Depending on cost, current rating etc, I would choose a basic finish for the board that is commensurate with the first two points raised above (ENIG and ENEPIG are two popular finishes, but I would do more in depth research), and for long term reliability have the ring terminal pads selectively hard gold plated.
 
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    Regnum

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jasminepav99

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ENIG is best if further precaution do the conformal coating after board tested
 

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