[PCB_FORUM] Re: Finish: Matte tin vs ENIG ?

If you ever find out, you'll probably be one of the first to know.
 
We settled in immersion Ag, and was then told that Au would possibly be better. 
 The other day, I heard that white tin (matte tin?) is now the preferred 
choice.  (It's only a matter of time before Ag is preferred again.)  The whole 
LF debate is so subjective, and everything contradicts everything else.
 
I'm starting to believe that LF was invented by a component manufacturer and a 
lawyer that one day met in a bar, conjuring up one of the world's money-making 
schemes.

>>> trobinson@xxxxxxxxxx 28/06/2005 7:12:38 a.m. >>>


With LeadFree coming, I'm trying to find out what is the best all around
finish requirement to put on my fab drawing.

My boards have a 50mil pitch BGA. The soic's down to .4mm pitch.

Matte tin, ENIG ?? I imagine Matte tin would be the cheapest.

Also, with the extra heat needed in reflow, will FR4 be ok?

Any help will be appreciated.

tr :)

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