The TAJT475M020RNJ: At 4.7 µF and 20 V rated, this TAJ series tantalum is a standard decoupling cap for 12 V or 5 V rails — but solid tantalum demands a 50% voltage derating in practice, so the usable rail voltage is 10 V maximum. Running it at 12 V without derating risks field failure from dielectric breakdown. The 3.1 Ohm ESR is typical for a general-purpose tantalum of this size; it is not a low-ESR type.
The molded case and surface-mount 1411 (3528 Metric) footprint keep the board profile low at 1.20 mm seated height.