3.5mm stereo jack, 3-conductor, no switch
The SJ-3523-SMT-TR is the 3-conductor (TRS) member of CUI Devices' SJ series 3.50 mm phone jack family, accepting a standard 3.5 mm mini-plug. Rated 1 A at 12 VDC with silver-plated contacts, it mounts surface-mount right-angle and does not contain an internal switch.
Switch vs no-switch: SJ-3523 vs SJ-3524
Within the SJ-35 subfamily, the SJ-3523-SMT-TR (3 contacts, no switch) differs from the SJ-3524-SMT-TR (4 contacts, single switch) — the switch contact adds a fourth terminal for detecting plug insertion, while the 3.50 mm mating diameter, 1 A rating, and SMT right-angle footprint are shared across both.