Working with Backdrilling in Allegro PCB Designer: Best Practices
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Stub Calculation
Pin Plating Restrictions
The manufacturer of a connector might specify a minimum plating depth from the
mounting side to ensure its pins are fastened to the PCB properly. If pins on a
connector with this restriction are to be backdrilled, the minimum pin plating depth will
take precedence over resolving the stub violation.
From the Connector Routing Guide– "The requirements of finish hole size and
copper barrel thickness must be maintained in the via from the board surface (applied
connector side) through 1.00 mm depth to guarantee the mechanical performance of
the compliant pin."
