I would go the one other option if vibration or thermal cycling was low...HASL and leadfree...

But is if is a Mil app I thought you were stuck with HASL and leaded....
 
Paul

Paul Edwards
Process/Quality Engineering
Surface Art Engineering


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steven Kelly
Sent: Thursday, July 07, 2011 10:56 AM
To: [log in to unmask]
Subject: [TN] Leaded or non

Hi All,
I have an 18 layer rigid flex (buried and blind)  that we are preparing to put the surface finish on and then assemble.
Lots of BGA's etc.
The BGA's are lead free.
Options:

1)      ENIG and lead free assembly

2)      Immersion silver and lead free assembly

3)      HASL and leaded assembly
Hi end military product.

Thoughts or comments would be appreciated.
Thanks. Steve Kelly

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