50 Ohm impedance suits RF test and telecom gear. The 4 GHz upper limit covers common RF bands.
Sourcing and Lifecycle Reality
If your design can tolerate a parametric alternative, a standard 50 Ohm BNC jack from the same TE family (same 4 GHz, same right-angle through-hole footprint) is the practical cross-shop, but no pin-compatible drop-in replacement is documented.
The center contact is beryllium copper with gold plating, good for low and stable contact resistance across the 500-cycle life. Dielectric is polymethylpentene (PMP), which holds up to the temperature range without significant RF loss shift. Termination is solder for both center contact and shield — no crimp option on this variant, so plan for soldering into the assembly process.