The Amphenol RF 2FA1-NDSJ-C01-0 is a Fakra-coded SMB jack — a female socket connector that combines the snap-on SMB interface with the colour-coded keying and latch lock of the Fakra automotive standard. It is a 50 Ohm design rated to 6 GHz with a specified insertion loss of 0.3 dB, built for in-line, free-hanging cable termination. The Fakra variant (Code D, violet/claret housing) is the version used in automotive antenna and infotainment RF links where the standard SMB's push-on retention is replaced by a positive latch lock that survives vehicle vibration. This is a crimp-termination connector — the centre contact crimps onto the signal wire, the shield crimps onto the cable braid, and the included ferrule completes the cable-clamp termination. The kit ships with three pieces: the connector body, one centre contact, and one ferrule, so one order code covers the full termination hardware.
Cable Group Fit — Get This Right or the Termination Fails
The 2FA1-NDSJ-C01-0 is dimensioned for a specific set of cable groups: RG-174, RG-188, RG-188A, RG-316, LMR-100, and M17/119-RG174. These are all small-diameter, 50 Ohm coaxial cables with a nominal outer diameter around 2.5-3.0 mm and a solid or stranded centre conductor of 0.5-0.8 mm. If your cable is not on this list — say RG-58, RG-142, or LMR-200 — the crimp ferrule and centre-contact barrel will not match the cable dimensions, and the termination will fail either electrically (impedance step) or mechanically (pull-out under tension).
RF Performance and the 6 GHz Ceiling
The 0.3 dB insertion loss across the DC-to-6 GHz band is specified for this crimp-style Fakra connector. The 50 Ohm impedance is fixed by the geometry of the SMB interface and the Fakra housing.
Mating Cycles and the Latch Lock — Field-Service Reality
After 100 cycles, the latch may lose its positive detent feel, and the connector can vibrate loose in an automotive environment. If your application requires frequent disconnect-reconnect (e.g., test equipment, prototype harnesses), plan for connector replacement before the 100-cycle mark or consider a higher-cycle-rated RF connector family.
Construction and Materials — What the Nickel Body Tells You
The body is zinc die cast with a nickel finish.