What this stacked USB-A receptacle does in the assembly
It carries 8 contacts total (4 per port), rated 1 A per contact at 30 VAC, and is specified for 1500 mating cycles, which is well above the typical 500-cycle consumer USB connector.
The 5787745-1 includes board locks — those metal tabs that solder into plated through-holes alongside the signal pins. They anchor the connector against the insertion and extraction forces of repeated USB plugging, which is the main mechanical stress this part sees in service. Without them, the solder joints on the signal pins would take the full shear load every time someone yanks a cable.
Mating cycles and contact plating — durability for field service
The gold-grade plating carries the higher cycle life.
Temperature range and flammability — environment fit
These two specs together mean the connector is suited for environments where a consumer-grade USB port would be out of its depth — unheated storage, factory floors, or telecom shelters.