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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