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Date: | Thu, 22 Aug 96 16:31:26 EST |
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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.
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______________________________ 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
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--------------------------------------
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.
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Subject: assy:Immersion gold finishes
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