Hi Lee - You might try another approach with the customer. Image that you
have a very large, nonflexible beach ball and you are trying to balance it
on your local parking lot speed bump - if you are using a HASL finish and
processing BGAs or CSPs you are doing the same procedure. Sometimes having
a visual reference is worth a pound of tolerance measurements. Good Luck.
Dave Hillman
Rockwell Collins
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Lee Whiteman <[log in to unmask]>
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[TN] ENIG / HASL CO-PLANARITY
Happy Friday.
Does anyone have a reference on comparing the co-planarity between ENIG
and HASL (SnPb)? I know that ENIG is more planar than HASL, but by how
much (quantifying the argument). I'm anticipating a question from my
customer on why I want to use ENIG instead of HASL for fine pitch
applications.
Thanks.
Lee Whiteman, PMP
Senior Member Engineering Staff
L-3 Communications East
Telephone: (856) 338-3508
FAX: (856) 338-2906
E-Mail: [log in to unmask]
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