Stack Height Selection and the Ground Plate
Its defining spec is the dual mated stacking height: the same receptacle works at either 5 mm or 8 mm, depending on the plug height you pair it with. That flexibility means one board layout can serve two enclosure z-height budgets — useful when a single PCB design ships into different chassis. The ground plate running the length of the connector provides a low-inductance return path and a shield against radiated emissions, which matters when 220 high-speed lines share a narrow pitch and crosstalk becomes the limiting factor on signal integrity.
Mating Half and Stack Height Math
This receptacle mates with the Free Height (FH) plug 3-6318491-6, which carries outer shroud contacts and a board height of 7.45 mm. If your board stack calls for 5 mm, pair this receptacle with the shorter plug variant; for 8 mm, use the taller plug. The 0.50 mm pitch means the breakout fanout needs micro-vias or tight trace/space rules — plan the escape routing before committing the footprint.