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| From [log in to unmask] Mon Jan 27 08: |
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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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