It belongs to the Fakra sub-family of the SMB interface standard, which adds a colour-coded mechanical keying and a locking ramp — the locking ramp here replaces the standard SMB snap-on with a positive latch that resists vibration-induced disconnect in vehicle harnesses. The through-hole mounting and solder termination suit it for PCB attachment alongside standard wave-solder processes, while the gold-plated brass center contact and tin-plated zinc body deliver a cost-optimised RF path for interior or under-hood environments where full stainless/gold body construction is not required.
Key features and deployment context
The locking ramp fastening type is the defining feature of this Fakra variant — unlike a standard SMB snap-on coupling, the ramp engages with a tactile click and requires a deliberate pull to release, making it suitable for harness sections subject to vehicle vibration or incidental cable snag. The 50 Ohm impedance is held through the interface geometry and the dielectric material — a polycyclohexylenedimethylene terephthalate (PCT) / polyester blend that maintains consistent RF performance across the operating band. The tin-plated zinc body provides adequate shielding for interior automotive RF links (GPS, cellular, WiFi modules) without the cost premium of a gold-plated stainless body; the trade-off is reduced corrosion resistance in salt-spray or direct-exposure environments, so this variant is best specified for cabin or protected locations rather than wheel-well or bumper-mount positions.