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July 2008

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Subject:
From:
"Gold, Scott" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Gold, Scott
Date:
Wed, 16 Jul 2008 13:47:47 -0400
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Yes, I am working with 300 microns diameter wire. 

I need access to the exposed conductive wire, mostly at the ends, but in
the middle as well.  Insulation is not feasible.

--Scott


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Fjelstad
Sent: Monday, July 14, 2008 5:34 PM
To: [log in to unmask]
Subject: Re: [TN] Plated Wire in Wedge Bonding

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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