2.2 µF at 50 V — the BOM-fit anchor
The TAJC225K050RNJ: This is a molded tantalum capacitor from the TAJ series, rated 2.2 µF at 50 V with ±10% tolerance — the capacitance and voltage are the first check against your BOM line. The 2312 (6032 Metric) case measures 6.00 mm x 3.20 mm with a seated height of 2.80 mm, fitting standard surface-mount footprints for this size code C.
ESR and temperature — the derating drivers
The 2.5 Ohm ESR limits ripple current handling — self-heating from ESR must stay within the thermal budget at 50 V and 125°C.