Tom/Robert,

The PCB supplier I use manufactures to class 3 and provides all the documentation, cross sections and solderability sample as required.

They will have no problem manufacturing the PCB but pointed out that a 4mil laser hole wasn't going to pass Class 3.

So basically it's impossible to design a PCB with a high count mirco BGA on it to Class 3?

As you say the rules are the rules, I just though with the way technology is going, this might have been an area that was under review?

Thanks,

Larry

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