BNC to U.FL Between-Series Adapter
The Hirose BNCP-UMJ(40) is a between-series RF adapter that converts a BNC Plug, Male Pin to a U.FL (UMCC) Jack, Male Pin. It belongs to the BWA series and is designed as a free-hanging (in-line) straight adapter, meaning it sits inline with the cable path — no right-angle bend to route around enclosures.
What the 1 GHz Limit Means in Practice
The 1 GHz maximum frequency is the combined limit of this adapter's construction — the BNC bayonet interface, the U.FL snap-on connection, and the internal transition between centre conductors. For signals below 1 GHz (GPS at 1.575 GHz is out; cellular LTE bands, ISM 915 MHz, and most test-equipment reference signals are in), the 50 Ohm path through the PTFE dielectric maintains a clean impedance match. Above 1 GHz, expect roll-off in return loss that makes this adapter unsuitable for precision measurements or wideband data links.
Obsolete — Sourcing Reality
There is no listed direct replacement from Hirose. If you need a production-available alternative, the closest functional match would be a different between-series adapter (BNC to U.FL) from another manufacturer, but pinout and mechanical fit must be verified against your existing assembly.
Mating Cycles and Field Service
Rated for 1000 mating cycles — a high figure for an adapter that sees repeated connect/disconnect in test setups or field-service cable assemblies. The gold-plated centre contacts (male-to-male through the adapter) resist fretting corrosion over that cycle life. The PTFE dielectric holds its dielectric constant through temperature swings, so the impedance stays stable across repeated thermal cycles in outdoor or unheated equipment enclosures.