Alan:
  I suspect that most experience with Tin/Lead will be with HASL finished boards, and Tin/Lead plating and HASL are not the same finish.  Tin/Lead plating, unless it is fused/reflowed is small discrete crystals of Tin and Lead, which oxidize easily, unlike HASL, which does not.
   
  And always remember, free advice is often not worth what you paid for it!
   
  Rudy Sedlak
  RD Chemical Company

Alan Kreplick <[log in to unmask]> wrote:
  To All:

Anyone want to share thoughts/comments/guidelines on pwb-hole plating 
press-fit connectors. Specifically ENIG vs. Tin/Lead.

I've been told and saw in one article that tin/lead (soft) is preferred 
over ENIG (nickel hard).

Thanks in advance,

Al Kreplick
Sr. Manufacturing Engineer
Circuit Card Assembly
Air-toAir/Precision Strike/Land Combat
Raytheon Integrated Defense Systems
978-470-9931office
978-245-1702 pager
978-470-4307 fax
[log in to unmask] 

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