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July 2008

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Subject:
From:
Joe Fjelstad <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Mon, 14 Jul 2008 17:33:33 EDT
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Hello Scott, 
 
Do I read it right that you want to plate aluminum bonding wire with  another 
metal and that the wires are 300 microns in diameter?  I have not  heard of 
such but perhaps someone else has. Is there a reason why you cannot  
encapsulate the wires after bonding to address oxidation concerns? 
 
There are also some folks out there who have developed insulated wire  that 
is bondable  and there are as well some methods from earlier years  such as 
stitch wire and/or resistance welding of ribbon wire that might be of  interest. 
 
But it might be best to talk to some of the heavy gage wire bonding  
equipment suppliers to gather their experiences.
 
Good luck
Joe 
 
 
 
 
In a message dated 7/14/2008 11:49:41 A.M. Pacific Daylight Time,  
[log in to unmask] writes:

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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