The 221789-3: This is a single-port, panel-mount or PCB-mount RF interconnect suited for test equipment, telecom infrastructure, and instrumentation where a reliable 50 Ohm launch up to 4 GHz is needed.
The 500 mating cycles mean the gold-on-gold contact interface will hold its performance across repeated connects in a test rack or field-deployed system. The threaded coupling (per the SMA standard) locks the pair against vibration loosening — important for any environment where the cable sees movement.
Obsolete — Sourcing Reality
The 221789-3 is officially obsolete per TE Connectivity's lifecycle status. There is no documented direct replacement or cross-reference in the evidence.
Through-hole mounting with solder termination for both the shield and the center contact. The threaded fastening requires a mating SMA plug with a hex nut or knurled coupling — no push-on or bayonet lock.