Hirose UG-625/U-4(40) BNC Jack — 50 Ohm Bulkhead Mount
The Hirose UG-625/U-4(40) is a BNC jack, female socket, designed for 50 Ohm systems with a maximum frequency of 4 GHz. It is a panel-mount bulkhead connector with a bayonet lock, using a rear-side nut for installation. The connector comes as a kit including the jack, one lockwasher, and one nut — everything needed for a single panel feed-through. The centre contact is beryllium copper with silver plating, terminated via a solder cup. The shield connects through a solder tag on the body. The dielectric is PTFE, and the brass body has a nickel finish. Rated for 5000 mating cycles, it suits test equipment, instrumentation, or any application requiring frequent connect/disconnect. The silver-plated centre contact offers low resistance but may tarnish in corrosive atmospheres — consider gold-plated alternatives for harsh chemical exposure.
Lifecycle Status — Last Buy, Sourced to Order
The Hirose UG-625/U-4(40) carries a Last Buy lifecycle status. This means the manufacturer has discontinued production, and remaining stock is limited. No official replacement order code is on record from Hirose; any substitute would need to be evaluated for fit, impedance, and frequency performance.
Termination and Installation — Solder Cup and Solder Tag
The centre contact uses a solder cup termination — strip the centre conductor, tin it, and solder into the cup. The shield braid or drain wire is soldered to the solder tag on the body. This is a field-terminable connection, though it requires a soldering iron and steady hands. The lockwasher and nut secure the connector to the panel from the rear; the bayonet lock provides quick mating with a male BNC plug.
RF Performance — 50 Ohm, 4 GHz Bandwidth
This BNC jack has a 50 Ohm impedance and a maximum frequency of 4 GHz.