75 Ohm BNC Jack — 4 GHz Ceiling for Video and Telecom Coax
The 6274291-1: That impedance targets standard video, broadcast, and telecom coax — not the 50 Ohm world of RF test gear. The 500 V rating and 500 mating cycles suit it for patch panels and instrumentation where the connector stays mated for long periods but sees occasional re-patching. The through-hole solder termination and bayonet lock give a solid mechanical mount on the PCB or panel.
75 Ohm is the standard impedance for composite video, SDI, and CATV distribution — a 50 Ohm BNC would create a mismatch reflection at the transition. The 4 GHz ceiling covers 3G-SDI and 12G-SDI comfortably, with headroom for multi-channel video transport. The gold-plated beryllium copper centre contact gives low and repeatable contact resistance over the 500-cycle life.
Construction and Termination Details
The body is tin-plated zinc — the tin finish gives adequate corrosion resistance for indoor equipment racks and patch bays. Shield termination is solder, same as the centre contact, so both the signal and ground paths are soldered to the board or cable. The bayonet lock engages with a quarter-turn, giving a positive mechanical connection that resists vibration-induced disconnect.