Board-Fit and Routing Density
The 91596-508LF: The bottom-entry SMT orientation means the connector sits flush against the PCB, with the mating interface on the component side; the insulation height is 0.091" (2.30mm), leaving a low z-height budget above the board.
Mating Interface and Cycle Life
Beryllium copper contact base material provides the spring-force stability to maintain normal force over temperature cycling. For a board-to-board or cable interconnect that sees periodic reconnection in service, the 15µin gold layer supports several hundred cycles before the underlying nickel barrier sees exposure.