What it is and what it carries
The SJ2-25102B-SMT-TR is the 2-conductor mono member of CUI Devices' SJ2 2.50 mm phone jack series. Rated 1 A at 12 VDC with gold-plated contacts and a single internal switch, it mounts surface-mount right-angle and terminates by solder.
Circuit count across the SJ2-25 family
Within the SJ2-25 base, the SJ2-25102B-SMT-TR's 2-conductor mono configuration sits below the 3-conductor stereo SJ2-25103A-SMT-TR and the 4-conductor TRRS SJ2-25974B-SMT-TR — the 2.50 mm mating diameter, 0.433" (11.00 mm) mating depth, and SMT right-angle footprint are shared across the series, so the selection narrows to the number of signal lines the application requires.