50 Ohm BNC Jack, 2 GHz Ceiling — Hirose BNC-R-PC(40)
It's a standard bayonet-lock BNC interface, but the spec sheet stops at 2 GHz — that's the usable frequency ceiling before the BNC geometry starts to mode, so treat it as a sub-2 GHz part for clean signal transfer. The silver-plated beryllium copper centre contact and PTFE dielectric keep the impedance steady across that band. Rated for 5000 mating cycles, which is well above the typical 500-cycle BNC. That cycle life points to a connector meant for test equipment, instrumentation panels, or field-swappable modules where the cable gets disconnected regularly. The nickel-plated brass body and silver centre contact hold up to repeated connect-disconnect without the plating wearing through to base metal. The shield termination is solder — you're soldering the braid to the shell, not relying on a crimp ferrule, which gives a lower DC resistance ground path at the cost of a slower assembly step.
BNC-R-PC(40) vs BNC-R-PC(50)
The BNC-R-PC(50) shares the same 50 Ohm impedance and BNC jack form factor, but the suffix difference — (40) vs (50) — typically indicates a plating or material variant in Hirose's BNC-R series. The (40) carries silver centre contact plating; the (50) may use a different centre contact finish. For RF signal paths, the plating grade affects contact resistance and intermodulation performance at higher frequencies, so confirm the BOM's required plating before substituting.