It depends.  If your board is flexible somewhat and you do require drop test or random vib, and your support points (screw position) is far and in between... you might need to worry, not just assembly (flatness is not a issue as you say), but reliability.  

Joyce Koo
Materials Researcher - Materials Interconnect Lab
Research In Motion Limited
Office: (519) 888-7465 79945
Mobile: (226) 220-4760

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Monday, January 14, 2013 11:36 AM
To: [log in to unmask]
Subject: [TN] Mounting Hardware to QFP Component Lead

To the assembly professionals out there:

Have you ever had reliability issues with mounting screws if they are near
a Quad Flat-Pack? My 144 pin land pattern is pretty close (100mils) but we
are mounting the board into a very flat structure (no bowing)
I can't imagine the compression of the board material could affect
gull-wing style lead connections (maybe BGA?) but I don't know...

thanks,
Jack


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