The Molex 0731000258 is a 75 Ohm SMB receptacle with a male pin contact, part of the Series 73100 coaxial connector family. The gold-plated brass body and center contact, combined with a PTFE dielectric, deliver consistent 75 Ohm impedance up to 4 GHz with a typical insertion loss of 0.2 dB. The snap-on fastening provides quick connect/disconnect, rated for 500 mating cycles — suitable for test equipment, video distribution, or telecom infrastructure where repeated access is needed.
The 75 Ohm impedance sets this SMB receptacle apart from the more common 50 Ohm SMB variants. At 4 GHz bandwidth and 335 V rating, it covers baseband video, CCTV, and low-power RF distribution where 75 Ohm characteristic impedance is the standard — think broadcast video routers or cable modem termination equipment. The 500-cycle mating life is high for a snap-on coaxial connector, reflecting the gold-on-gold contact interface that resists fretting corrosion over repeated matings.