What the 3.3 µF / 50 V rating means for your rail
The TAJD335K050RNJ is a molded tantalum capacitor from the TAJ series, rated at 3.3 µF capacitance with ±10% tolerance and a 50 V DC rated voltage. That 50 V ceiling gives you headroom on a 24 V or 28 V bus, but on a 48 V telecom rail you are running right at the limit — tantalum caps see a derating rule of thumb at 50-60% of rated voltage, so 50 V is tight for a 48 V rail unless you accept the reliability hit. For a 3.3 µF cap on a switching regulator output, the ESR dominates the voltage ripple — do not expect this cap to handle high-frequency ripple from a buck converter running at 500 kHz without significant self-heating.
Temperature grade and where it runs
The 2917 (7343 Metric) case is the standard D-size tantalum footprint — 7.30 mm x 4.30 mm body, 3.10 mm seated height. Surface-mount reflow profile follows JEDEC J-STD-020 for MSL 3 (moisture sensitivity level typical for molded tantalums); bake before reflow if the bag humidity indicator card shows >10% RH.
RoHS compliance is standard for the TAJ series, but confirm the specific date-code lot certificate at order — the manufacturer's general-purpose feature code does not guarantee exemption status.