Can you recommend really really good source that can plate 20 micro inch
gold?  I'm open to going that way.

Is there a way to selective gold plate 20 micro inch gold w/o having to
electrically short the pads together?

Andy LeVesque
[log in to unmask]
616-772-1590 ext 294
mobile 616-218-8846
 

-----Original Message-----
From: Joyce Koo [mailto:[log in to unmask]] 
Sent: Wednesday, October 05, 2005 9:10 AM
To: TechNet E-Mail Forum; LeVesque, Andy
Subject: RE: [TN] Need ENEPIG sources

really really good guy can plate 20 micro inch gold that is wire
bondable...as for IG, you might want check the many reliability and
bondability study in the past... here is a start:
http://www.amkor.com/products/notes_papers/RHUEM_Article0198.pdf
                                     jk (my 1.72 cents)
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of LeVesque, Andy
Sent: Tuesday, October 04, 2005 7:57 PM
To: [log in to unmask]
Subject: [TN] Need ENEPIG sources


New to this forum and looking for recommendations, please.  Hope this is
the right place for this.
 
We are doing COB with thermosonic gold wire ball bonding using ENEPIG as
a board finish.  Our customer will not let us use thick soft gold due to
gold embrittlement concerns on the solder joints. 
 
When our board house gets the plating right our wire bonding goes great,
but more times than not we're chasing plating variation within lots.
 
We've been to the Far East working with the vendor to improve their
plating baths and etc, but it appears that we're beginning to wear out
our welcome with the supplier.
 
Can any of you please recommend a Far East supplier (about 500K brds/yr)
and a quick turn stateside ENEPIG PCB suppliers?
 
thanks in advance,
 
Andy LeVesque
 
 

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