Contact system and mating duty
The SJ-43514-SMT-TR is a 4-conductor (TRRS) phone jack from CUI Devices' SJ series, accepting a 3.50 mm industry-standard mini plug.
Switch options across the SJ-43 family
The SJ-43514-SMT-TR carries no internal switch — the 4 contacts are dedicated to the tip, ring, ring, and sleeve signals. For designs needing a normally-closed switch on one or two poles, the SJ-43515TS-SMT-TR and SJ-43515RS-SMT-TR each add a single switch (5 contacts), while the SJ-43516-SMT-TR adds two switches (6 contacts). All share the same 3.50 mm mating diameter, 0.551" (14.00 mm) mating depth, and SMT right-angle footprint.