MCX Receptacle, 50 Ohm, 6 GHz — Interface and Fit
The Amphenol 919-109J-51PX is a 50 Ohm MCX receptacle with a female socket contact, designed for through-hole solder termination to a PCB. The 0.1 dB insertion loss at 6 GHz is low for a snap-on connector, indicating the PTFE dielectric and beryllium copper centre contact hold a clean 50 Ohm match across the band.
Ratings That Govern the RF Path
The 6 GHz maximum frequency is the practical ceiling; above that the snap-on interface geometry and the PTFE dielectric's loss tangent begin to degrade return loss. The 500 mating cycles are standard for a gold-plated RF connector — the snap-on coupling wears faster than a threaded SMA, but 500 cycles covers test-board and field-service life without contact fretting.
The dielectric is PTFE — the standard RF-grade material that holds the impedance tolerance through temperature and humidity. Shield and centre contact both terminate by solder — through-hole on the shield legs, solder cup on the centre pin. The snap-on fastening locks with a positive detent; no coupling nut torque to verify.