We had the same problems when we wanted immersion gold and got electroplated 
gold.  The immersion gold /electroless nickel product was "transparent" in our 
process developed for HASL solder.  

[log in to unmask] 

______________________________ Reply Separator _________________________________
Subject: Re: assy-Immersion gold fini
Author:  [log in to unmask] at ftl03
Date:    8/22/96 3:13 PM


                      RE>assy:Immersion gold finishes              8/22/96

Stephen,

We had some boards which had been spec'ed to be immersion gold over = 
electroless nickel with which we had limited success, as well.  When we = 
did some in-depth checking, however, we discovered that it was actually = 
electrolytic gold over electrolytic nickel, and in places the gold = 
thickness was in the several hundred microinch range (as opposed to 3-8 = 
for immersion).  We attribute the soldering difficulties to this.  

In the limited tests that we have performed with i.Au/e.Ni, we've had = 
great success soldering with conventional soldering chemistries and = 
processes.

Regards,
Greg Bartlett
Mercury Computer Systems
Chelmsford, MA  
[log in to unmask]
-------------------------------------- 
Date: 8/22/96 2:07 PM
To: Greg Bartlett
From: STEPHEN WELDON

   I am currently venturing into the world of pcb metallic finishes.  I =
have acquired some pcb's with immersion gold on them and have met with = 
what seems to be limited success.  I was wondering if there are any tricks = 
of the trade for processing these style boards thru a conventional = 
SMT/Wave solder process?  If a different formulation other than 63/37 = 
solder paste is recommended? and who it stacks up to the OSP coatings?


 Stephen Weldon
 Manufacturing Engineer
 Diagnostic Instrument Co.
 [log in to unmask]


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