What the 5646957-1 Is and Where It Goes
It carries male power blades in a single row, all 7 positions loaded, and is terminated via press-fit into the backplane — no solder required.
The press-fit termination eliminates the thermal cycle risk of a solder joint in a high-current backplane, and the board guide aligns the header during insertion so the press-fit tails don't shear against the plated-through holes. Contact finish is listed as gold or gold-palladium. For a backplane power interconnect that sees limited mating cycles after initial assembly, either finish provides stable contact resistance over the life of the system. The gold option is the more common choice for the mating interface; the palladium variant adds wear resistance if the connector is part of a field-replaceable module that gets swapped during service.
The press-fit tails are designed for a specific backplane thickness and plated-through-hole diameter — the board fabricator needs the hole size called out in the TE product drawing.