The Amphenol RF 919-118J-51PT is a 50 Ohm MCX receptacle, female socket, designed for surface-mount termination on a PCB. It carries a single port with a snap-on fastening type, rated to 2 GHz maximum frequency. The gold-plated brass body and beryllium copper center contact with gold plating support 500 mating cycles, and the PTFE dielectric keeps insertion loss to 0.1 dB across the band. This connector suits RF signal paths in compact wireless modules, test equipment, and instrumentation where a low-profile, quick-connect MCX interface is needed.
Signal Integrity and Frequency Ceiling
The 2 GHz frequency ceiling defines the usable bandwidth — above that, the snap-on interface and PTFE dielectric begin to introduce reflections. The 0.1 dB insertion loss is low enough that a single mated pair in the signal path adds negligible attenuation at 2 GHz.
Mating Cycles and Field Service
For a permanent install, the cycle count is more than adequate; for a daily-use test port, it gives a reasonable service life before replacement.
Surface-mount termination with the shield soldered to the PCB ground plane. The snap-on fastening means the mating plug clicks into place without a coupling nut — quick to mate, but the retention relies on the snap detent, so the board-side solder joint must handle any cable strain.