FAKRA SMB Jack for Automotive RF — Code A Keying
The Amphenol FA1-NARJ-C04-0 is a FAKRA-coded SMB jack (female socket) designed for automotive-grade RF interconnects up to 6 GHz. It carries the Code A mechanical keying with a black/jet housing color, which prevents cross-mating with other FAKRA code variants in multi-connector harnesses — a common failure point when a GPS antenna lead gets swapped into a satellite radio port. The crimp shield termination and solder center contact are standard for RG-58-class cables — the listed cable group covers RG-58, 58A, 58B, 58C, 141, 303, LMR-195, Belden B7806A, and 9907. The right-angle free-hanging orientation suits tight routing behind a dashboard or infotainment module where a straight plug would exceed the bend radius.
Cable Compatibility and Termination Sequence
The cable group is the first fit check: RG-58, 58A, 58B, 58C, 141, 303, LMR-195, Belden B7806A, and 9907 all share a nominal 0.195-inch dielectric diameter and a 0.106-inch center conductor, which matches the center contact bore and ferrule ID. The PTFE dielectric material handles the soldering heat without degrading the impedance match.