75 Ohm SMB Mini Plug — Through-Hole, Snap-On
It uses a snap-on fastening mechanism for quick, tool-less mating with the corresponding SMB jack. The gold-plated brass body and beryllium copper center contact, plated in gold, deliver consistent RF performance across the connector's rated band. Insertion loss is specified at 0.3 dB per mated pair, a clean figure for a snap-on subminiature connector. The dielectric is PTFE, which maintains stable impedance across the temperature range and provides low signal loss at RF frequencies.
75 Ohm vs 50 Ohm — Selecting the Right Impedance
The 142134-75 is a 75 Ohm SMB plug, distinct from the more common 50 Ohm SMB variants such as the Amphenol 142138 (a 50 Ohm SMB jack, male pin). The impedance difference is non-negotiable — a 75 Ohm plug mated into a 50 Ohm system creates a mismatch that degrades return loss and increases VSWR. Choose the 142134-75 for 75 Ohm coaxial cable systems (common in video, broadcast, and some telecom distribution) and the 50 Ohm version for RF test equipment, antennas, and general-purpose radio frequency paths. The 142134-75 is a plug with a female socket, while the 142138 is a jack with a male pin — they are mating halves, not alternatives. For a 75 Ohm system, the 142134-75 mates with a 75 Ohm SMB jack (male pin, such as the Amphenol 142135 series).