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> - No more than 5 balls per square inch allowed
> - Solder balls cannot be greater than 5 mil (0.005in)
> - Solder balls cannot be less than 5 mil from the nearest land or trace
This sounds a bit arbitrary so if you want a neat metric rule why not:
- No more than 1 ball per 100mm^2
- Solder balls cannot be greater than 100um
- Solder balls cannot be less than 100um from the nearest land or trace
David Whalley
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