What is the 1-1478204-0?
The female socket accepts a standard BNC plug, and the brass body with silver plating gives good RF conductivity and corrosion resistance for indoor and sheltered outdoor equipment.
Where is this connector used?
The BNC interface and 50 Ohm impedance make this jack a natural fit for RF test equipment, instrumentation, telecom base station backhaul, and broadcast video gear. The bayonet lock is faster to mate than a threaded connector — good for panel faces that get frequent reconfiguration.
50 Ohm is the standard impedance for RF transmission lines — matching this jack to a 50 Ohm cable and system avoids reflections that eat signal power. The 4 GHz ceiling covers most cellular bands (LTE, 5G sub-6 GHz), Wi-Fi, and GPS L-band; above 4 GHz the insertion loss climbs and the VSWR degrades. Silver-plated center contact and body keep surface resistivity low at those frequencies — tin or nickel would add loss.
Lifecycle and sourcing — this part is obsolete
The 1-1478204-0 is listed as Obsolete. If you need a form-fit-function replacement, the Greenpar series includes other 50 Ohm BNC jacks with the same bayonet lock and through-hole solder termination; confirm the footprint and panel cutout against your board layout before substituting.