Hi Phil, I believe you might have 6012 C3 issues with minimum spacings in certain situations, hole/pad annular rings in certain situations, and hipot voltages (if you hipot) in certain situations. There could be others and I'll come back if I can recall them. Brs, Gerry
 > Date: Wed, 11 Apr 2012 16:27:20 -0700
> From: [log in to unmask]
> Subject: [TN] 1.0 and 0.8 mm Pitch BGAs cannot meet Class 3?
> To: [log in to unmask]
> 
> I am being told that it is not possible to layout a BGA for IPC-6012
> Class 3 if the pitch is 1.0 or 0.8 mm.
> 
> I am not a board designer but this doesn't sound right to me.   I had a
> lot of experience with BGAs at 0.5 mm pitch but that was always with
> Class 2 requirements.
> 
> Is anyone laying out PWBs with 0.8 mm pitch BGAs and still meeting Class
> 3 for spacing?  
> 
> 
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