SMB Receptacle for 50 Ohm RF Paths
The 413990-2: It's the kind of part you reach for when you need a snap-on RF interconnect on a PCB — common in telecom basestation cards, test equipment, and GPS receiver modules where the board launches a coaxial signal to a cable assembly. The 4 GHz maximum frequency and 0.3 dB insertion loss give it a clean passband for L-band and lower C-band work, and the 335 V rating means the dielectric stack has headroom above typical 50 Ohm signal levels.
Construction That Survives the Board Assembly Line
Gold plating on the centre contact matters here: 500 mating cycles is a solid number for a snap-on connector, and the gold-on-brass interface keeps contact resistance low over those cycles without fretting.