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   TO:         I4235700 IBMMAIL   new address for ipc technet 25.6.96

   FROM:       DSTEWART EX2       D.Stewart        - Product Development Manager.

   DATE:       27 January 1997
   SUBJECT:    Gold wiring bonding
   REFERENCE:  surface finish requirement

    Could someone with experience of ultra/thermo? sonic bonding of
    chips to pcbs please offer some help on the finishes that work on
    the pcb's pads.
    I am particularly interested in gold wire bonding.
    It has been suggested in the past that ENAu (5um EN, 0.07um Au) was
    ok , but our ENAu supplier is suggesting that this is now only ok
    for aluminium wire.
    The customer is asking for 5um Nickel, 0.5 - 1um pure (soft) gold,
    but is there a compromise?

    Dougal Stewart
    Exacta Circuits
    Scotland

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