The TAJB107M002RNJ is a molded tantalum capacitor from the KYOCERA AVX TAJ series, rated at 100 µF with ±20% tolerance and a 2.5 V voltage rating. Its 1.4 Ohm ESR (Equivalent Series Resistance) determines the ripple current it can handle without excessive self-heating — for a given ripple current, the power dissipation is I² × 1.4 Ohm, and the temperature rise must stay within the 125°C ceiling. The surface-mount 1411 (3528 Metric) case, size code B, measures 3.50 mm × 2.80 mm with a seated height of 2.10 mm max — a compact footprint for dense PCB layouts where bulk decoupling or hold-up capacitance is needed on a low-voltage rail.
The 125°C ceiling is the absolute maximum case temperature; derating the applied voltage by 50% is standard practice above 85°C to maintain reliability.