The TAJB685M020RNJ: This is a molded tantalum capacitor from the TAJ series, rated 6.8 µF at 20 V with ±20% tolerance. The 2.5 Ohm ESR sets the ripple-current limit and the self-heating budget. For a 20 V rail with a few hundred mA of ripple, the I²R loss stays under 50 mW — the part runs cool. If your design pushes higher ripple, check the ESR against the power dissipation derating curve in the datasheet.
Surface-mount footprint — 1411 (3528 Metric), size code B
Package is 1411 (3528 Metric), size code B — 3.50 mm x 2.80 mm footprint, 2.10 mm seated height. The molded case has a clear polarity mark (the banded end is the anode). On a rework bench, a standard hot-air station at 260 °C for 10 seconds per joint is enough to swap it; no special nozzle needed.