Hirose UM-QR-1(40) — U.FL (UMCC) Panel-Mount Receptacle, 50 Ohm, 1 GHz
The Hirose UM-QR-1(40) is a U.FL (UMCC) series receptacle with a male pin contact, designed for miniature coaxial interconnects in space-constrained RF assemblies. The connector is panel-mounted via a bulkhead rear-side nut, with the shield terminated through a solder cup — a configuration that lets the receptacle serve as a fixed feedthrough point on an enclosure wall. The body is machined from brass with a gold finish, and the centre contact is also brass with gold plating — the gold-over-brass construction resists corrosion and maintains consistent contact resistance across the 1000 mating cycles the snap-on fastening type supports.
50 Ohm Impedance and 1 GHz Bandwidth — RF Signal Path Fit
The 1 GHz ceiling means the connector is usable for cellular (LTE, 5G sub-6 GHz), ISM-band (2.4 GHz is above this limit), GPS (1.575 GHz is also above), and broadcast radio applications up to UHF. For designs requiring operation above 1 GHz, a higher-frequency U.FL variant or an SMA interface would be the next step. The snap-on fastening gives quick field mate/unmate without tools, and the 1000-cycle rating supports repeated access during test or maintenance without contact degradation.
Panel Mount with Bulkhead Nut — Enclosure Feedthrough Installation
The UM-QR-1(40) mounts through a panel hole and is secured from the rear with the supplied nut and lockwasher. The solder cup termination on the shield side accepts a coaxial cable centre conductor and braid — typical for a pigtail assembly where the cable is soldered directly to the receptacle before the nut is tightened. The bulkhead feature means the connector body is grounded to the panel, providing a reference plane for the shield. This is a common installation for an external antenna port on a metal enclosure, where the receptacle becomes the fixed half and the mating U.FL plug on the cable is snapped on from outside.