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How do they wash BGA parts?

Discussion in 'Electronic Design' started by Jeff, Jan 12, 2004.

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  1. Jeff

    Jeff Guest

    Just curious...Are BGAs mounted on boards with aqueous flux? Can the rinse
    water get under there to removethe flux?


  2. James Meyer

    James Meyer Guest

    I could tell you how I wash my balls, but then I'd have to change my
    name to Genome.

  3. Genome

    Genome Guest

    Would that be a ladle, a toothbrush and the morning water from an overnight
    Steradent soak?

  4. Jim Meyer

    Jim Meyer Guest

    Think "automation". A trip through the car wash in a convertable
    with the top down.

  5. John Larkin

    John Larkin Guest

    Our assembler uses non-water-soluble rosin flux, and just leaves it

  6. Use low residue no clean solder paste. ( Multicore or Kester makes this )
    Its non conductive and you can leave it there.
    You can't really clean under the BGA unless with ultrasonic cleaning and a
    highly volatile solvent.

    If you go to real mass production assembly they will use vapor phase
    soldering that leaves no residue whatsoever. ( the board exits out of the
    oven completely clean )

    Vapor phase uses heat transfer liquids. since the flux is soluble in this
    liquid and dissolves before the solder melts all flux is removed

    Halden makes this liquid at 200 $ a gallon . The Vapour is scrubbed and the
    transfer lquid recycles trought the machine.

    Vapor pahse soldering is the only reliable method of soldering for complex
    boards that have multiple BGA's on themi ( like computer motherboards)

  7. What about using an Indium compound, and plain old water as the heat
    transfer liquid? The only problem I could envision is that Indium
    might "wet" the solder mask.

    Anyone tried it?
    Can stuffed boards be exposed to steam for "a while?"
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