50 Ohm Between-Series Adapter: BNC Jack to U.FL Plug
The Hirose BNCJ-UMP(40) is a straight between-series adapter that converts a BNC jack, female socket to a U.FL (UMCC) plug, female socket. It belongs to the BWA series and is designed for free-hanging inline mounting. The 50 Ohm impedance and 2 GHz max frequency make it suited for test equipment, GPS receivers, and cellular signal paths where a standard BNC interface needs to connect to a miniature U.FL board-level connector. The dielectric material is PTFE, which keeps insertion loss stable across the band and holds the 50 Ohm characteristic impedance through the transition between the two connector families.
500 Mating Cycles and Bayonet Lock Retention
The BNC end uses a bayonet lock; the U.FL end uses a snap-on retention. Both fastening types give a positive mechanical mate that holds under cable flex, though the U.FL side is a push-on interface — no threading, so the engagement force is low.