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  1. #1
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    [moved] PCB finish for High Speed pcb

    Hello all,

    At the moment I am working on a design that carries several high speed signals, (40Mbit, 10Mbit). There is no soldermask on these traces and
    we need a finish for those traces.

    ENIG or ENIPIG are not possible because of the nickel and immersion silver wil oxidate over time.

    One of the possible finishes could be Electroless Palladium/Autocatalytic Gold (EPAG, EPIG)) but this appears to be a finish that not much
    pcb manufacturers offer.

    Any suggestions?

    - - - Updated - - -

    What a mistake I made.

    The signals are 40Gbit an 10Gbit. a bit faster.

    Quote Originally Posted by senilicus View Post
    Hello all,

    At the moment I am working on a design that carries several high speed signals, (40Mbit, 10Mbit). There is no soldermask on these traces and
    we need a finish for those traces.

    ENIG or ENIPIG are not possible because of the nickel and immersion silver wil oxidate over time.

    One of the possible finishes could be Electroless Palladium/Autocatalytic Gold (EPAG, EPIG)) but this appears to be a finish that not much
    pcb manufacturers offer.

    Any suggestions?
    Last edited by senilicus; 19th May 2016 at 06:01.

    •   Alt19th May 2016, 06:45

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  2. #2
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    Re: [moved] PCB finish for High Speed pcb

    Quote Originally Posted by senilicus View Post
    Hello all,

    At the moment I am working on a design that carries several high speed signals, (40Mbit, 10Mbit). There is no soldermask on these traces and
    we need a finish for those traces.

    ENIG or ENIPIG are not possible because of the nickel and immersion silver wil oxidate over time.

    One of the possible finishes could be Electroless Palladium/Autocatalytic Gold (EPAG, EPIG)) but this appears to be a finish that not much
    pcb manufacturers offer.

    Any suggestions?

    - - - Updated - - -

    What a mistake I made.

    The signals are 40Gbit an 10Gbit. a bit faster.
    It's best to avoid microstrip transmission lines for 40 Gbps applications. Use stripline transmission lines. Then you don't need to worry about surface finish.

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