75-Ohm TNC Bulkhead Jack, 4 GHz Ceiling
The TE Connectivity 5-1814804-3 is a TNC jack, female socket, part of the ZDC Greenpar series. The centre contact is gold-plated phosphor bronze, terminated via a solder cup — a straightforward field termination for coaxial cable. The body is nickel-plated zinc, and the package includes the connector body, lockwasher, nut, and solder tag. Rated for 500 mating cycles, this connector suits applications that see periodic disconnect and reconnect, such as test equipment or field-deployed antenna feeds.
There is no official successor listed on record. If you are designing a new system, consider a current-production 75-Ohm TNC jack from the same or a compatible series; verify the footprint and impedance match before committing.
The 75-Ohm impedance is the defining spec — this is not a standard 50-Ohm TNC. A 50-Ohm system will see a mismatch and degraded return loss. The 4 GHz upper frequency covers most baseband and IF signal paths, but not higher microwave bands. The solder cup termination accepts centre conductors up to roughly 1.5 mm diameter; the included solder tag handles the shield termination to the bulkhead.