Lee

Kudos from a long time lurker......

You're absolutely correct. Many many years of OEM experience with this
finish. Lots of fear over purported high cost of gold. There's a few
"application" secrets but it is the ultimate surface finish.

Now that the cat is out of the bag, how come you didn't mention immersion
silver?


Gerry Gagnon


From: Lee parker <[log in to unmask]>
Reply-To: TechNet E-Mail Forum <[log in to unmask]>,              Lee parker
<[log in to unmask]>
To: [log in to unmask]
Subject: Re: [TN] best plated surface finish
Date: Wed, 16 Nov 2005 08:25:34 -0500

John

Another option is flash gold over nickel. Both are plated inline using an
electrolytic process(as opposed to ENIG). The gold thickness is roughly two
micro inches. The OEMs that I am familiar with that have used this finish
have reported very good results.

Most of the PCB suppliers providing this process are in China.

Best regards

Lee

J. Lee Parker, Ph.D.
JLP Consultants LLC
804 779 3389
----- Original Message -----
   From: Babcock John<mailto:[log in to unmask]>
   To: [log in to unmask]<mailto:[log in to unmask]>
   Sent: Tuesday, November 15, 2005 7:28 PM
   Subject: [TN] best plated surface finish


   If somebody wants an extra smooth plating finish using lead free plating
   what material would they use...and what would be the finishing process?
   I've heard HASL is sort of rough...and it really doesn't apply using
   silver solder because of the melting temps.
   Is ENIG (electroless nickel immersion gold) the way to go to get a
   smooth finish?

   thanks!

   John Babcock
   PCB Designer III
   Isothermal Systems Research (ISR)
   2218 N. Molter Rd
   Liberty Lake, WA 99019
   [log in to unmask]<mailto:[log in to unmask]>
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