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January 2010

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Subject:
From:
Syed Ahmad <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Syed Ahmad <[log in to unmask]>
Date:
Tue, 5 Jan 2010 16:29:15 -0600
Content-Type:
text/plain
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text/plain (100 lines)
Strength depends on many things. Failure mode, first of all, as Joe is
alluding to. If they are breaking mid-span and above the minimum required
strength, and the wire lengths are the same, then the problem may be with
the wire. If they are breaking at the neck of the ball or the neck of the
stitch bond then it is a different problem. If they are breaking at the
joint to the metal on the other surface then it may relate to the Ni, gold
plating, metal or bonding parameters.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Fjelstad
Sent: Tuesday, January 05, 2010 4:12 PM
To: [log in to unmask]
Subject: Re: [TN] Pull strength of thermosonic wire bondable gold

Hi Steve
 
Your question brings up questions.  Are the bonds, which are being  tested 
and failing, stitch or ball? Can you notice any physical differences in  the

failures? Also what type of nickel plating are you using? It might be  that 
a higher stressed nickel is fracturing in bonding and setting up  the site 
to fail. 
 
Cheers,
Joe    
 
 
In a message dated 1/5/2010 1:18:08 P.M. Pacific Standard Time,  
[log in to unmask] writes:

Hi  All,

I have a wire bond question to the wire bond gurus who have helped  me out 
a lot in the past. Made 2 versions of a flex circuit - only varied the  
nickel thickness. Application is thermosonic gold wire bonding.

Flex  circuit lead is .0032 wide - version 1 - nickel is 150 microinches - 
soft gold  is 50 microinches- pull strength is X

Version 2 - nickel is 40 microinches - soft gold is 50  microinches - pull 
strength is approx. ½X  of version 1-

Is this  what I should expect?



Regards Steve Kelly



Steve  Kelly (PLEASE NOTE NEW E-MAIL ADDRESS)

(416) 750-8433  (work)

(416) 750-0016 (fax)

(416) 577-8433  (cell)




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