50 Ohm, 3 GHz — RF Signal Path Specs
The 3FA1-NISJ-C01W0: The 50 Ohm impedance matches the standard RF system impedance for telecom and wireless equipment, so the signal path sees minimal reflection at the interconnect. The 3 GHz upper frequency covers GPS, cellular (including 4G LTE bands), and ISM-band applications; above that the VSWR rises beyond the design window. The PTFE dielectric keeps insertion loss stable across the temperature range and provides consistent phase performance.
The listed cable group — RG-174, RG-188, RG-188A, RG-316, LMR-100, M17/119-RG174 — covers the common small-diameter 50 Ohm coax types used in vehicle and equipment harnesses.
Code I Keying — Fakra Variant Identification
The Code I keying is a Fakra colour-and-mechanical coding standard that prevents a jack from mating with a plug of a different code. This matters in multi-connector systems — GPS, satellite radio, cellular, and camera feeds each get their own code so the harness cannot be misassembled. The beige housing colour corresponds to the Code I assignment. When replacing a Fakra connector in an existing harness, confirm the code matches the mating plug.