Thanks everyone for you imput. What a great group of people!
Richard,
The application will be double sided, fine pitch array components, some
through hole components and going into a shock environment.
I will need to connect with the assemblers to check on flux and paste
compounds. Does this information help? You make an excellent point. Must
have the total picture. I do not know, yet, how long boards will sit on the
shelf before moving into assembly, either. I do know that shelf life
will also impact this decision.
I do not think that I want to use tin...that hairy growth stuff.
Barbara
On Thu, Jun 2, 2011 at 8:01 AM, Stadem, Richard D. <[log in to unmask]>wrote:
> Barbara,
> What is the application, board type, component types, etc?
> Immersion silver is my personal favorite, but that is completely
> irrelevant.
> You should choose a board finish dependent upon the application of the CCA,
> whether it has fine-pitch array components, including CSPs, whether it is
> double-sided with PTH parts or hand-soldered components, the environment the
> CCA will be used in, the flux type to be used, the alloy that is required,
> and several other factors that go into the decision. Without complete
> knowledge of all these factors, it is hard for anyone to answer that
> question. I can tell you that IAg beats ENIG in cost, but each finish has
> strengths and weaknesses. Some definitely have more or less than others.
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Barbara Burcham
> Sent: Wednesday, June 01, 2011 8:17 PM
> To: [log in to unmask]
> Subject: [TN] Best Board Finish - beyond gold
>
> Hey Y'all,
> I am looking for a reliable bare board finish that beats the cost of gold.
> What experience is out there?
> What would you recommend?
> Thanks,
> Barbara Burcham
> pcb Trace Design
> [log in to unmask]
>
>
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