2.2 µF, 16 V — rail decoupling and filtering fit
TAJB225M016RNJ is a molded tantalum capacitor from the TAJ series, rated 2.2 µF at 16 V with ±20% tolerance. The 5.5 Ohm ESR at 100 kHz sets the ripple current ceiling — for a 100 kHz buck converter output, the self-heating from ripple current stays within the 125 °C rated limit as long as the RMS current is kept under ~200 mA.
Surface mount footprint — 1210 / 1411 case
Package is 1411 (3528 Metric) / 1210, manufacturer size code B. Dimensions 3.50 mm x 2.80 mm, seated height 2.10 mm max. The molded case has no exposed paddle — standard reflow profile per JEDEC J-STD-020, MSL 3 typical for tantalum chips.
