Steve & Steve,
we have been wedgebonding directly on heavy nickelplated aluminium plates without problem, large mass use to couple mechanical waves better than weak materials that swing by. So, I think too that it has to do with the gold structure, hardness or temperature . First thing we use to do is using hard rubber or scalpel blade, just to make sure we don't have some surface contamination. Next, check workholder, both for temperature and mechanical support. If there is a space between the object and the workholder, ultrasonic mismatch can make bonding impossible. Another annoying matter is sometimes that the insulator becomes to soft, as Steve says, then you may have to try without preheat. I assume you have the correct capillary and wire hardness for the job.
Ingemar Hernefjord
Ericsson Microwave Systems
-----Original Message-----
From: Creswick, Steven [mailto:[log in to unmask]]
Sent: den 24 juni 2002 12:05
To: [log in to unmask]
Subject: Re: [TN] Wire bondable gold
Steve,
I echo what Joe has already said. This amount of gold should not be a
problem for gold wire bonding unless the components have not attained
bonding temperature (on the order of 150C), or something is moving/softening
during bonding.
Even aluminum wire should bond well to this amount of gold - but also as Joe
indicated, the long term reliability may be of some question.
See if the Customer can share a bit more info with you as to the type of
bonding performed, temperatures, and the type of problems experienced.
Steve Creswick - Gentex
-----Original Message-----
From: Steve Kelly [mailto:[log in to unmask]]
Sent: Saturday, June 22, 2002 11:22 AM
To: [log in to unmask]
Subject: [TN] Wire bondable gold
We made some flex circuits for a customer and wound up putting too much gold
on - approx. 75 microinches. The nickel is averaging 153. The gold meets all
the purity specs. Under the wire bond area is a large heat sink. My customer
is having difficulties wire bonding. Is too much gold a problem or can the
heat sink cause issues. Regards Steve Kelly
--------------------------
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