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July 2008

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Subject:
From:
Scott Gold <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Scott Gold <[log in to unmask]>
Date:
Mon, 14 Jul 2008 13:18:09 -0500
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Hello.  New to the list and wedgebonding.  Searched the archives.  I saw 
posts about bonding to plated pads on boards, but saw nothing on using or
bondability with plated wires.

I must avoid any oxidation on the wires. I'm trying to find out successes,
feasability and wire suppliers for plated aluminum wire. Gold plating is the best
for the outer coating for me. From what I've read its actually 150 microinches
Ni over 5-8 microinches of Au. Also from what i've read, the nickel is doing the
actual bonding.

The wire is .012" or 305 um diameter. Pure gold it out of the question! :)

The bonding surface is copper etched PCB, or sometimes gold plated brass.
Both proven to bond well with pur AL wire.

Thank you!

--Scott

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