+ Post New Thread
Results 1 to 2 of 2
  1. #1
    Full Member level 4
    Points: 3,338, Level: 13
    Achievements:
    7 years registered
    senilicus's Avatar
    Join Date
    Feb 2007
    Location
    Amsterdam / The Netherlands
    Posts
    211
    Helped
    56 / 56
    Points
    3,338
    Level
    13

    [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 07:01.

    •   Alt19th May 2016, 07:45

      advertising

        
       

  2. #2
    Junior Member level 2
    Points: 171, Level: 2

    Join Date
    Jun 2016
    Posts
    22
    Helped
    4 / 4
    Points
    171
    Level
    2

    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.

+ Post New Thread
Please login
--[[ ]]--