Molded tantalum construction and case size
The TAJA225K010ANJ: This is a Molded tantalum capacitor from the TAJ series, built in a 1206 (3216 Metric) surface-mount package with a seated height of 1.80 mm max — the standard footprint for general-purpose decoupling on dense PCBs.
The 2.2 µF capacitance at 10 V rated voltage fits common 3.3 V and 5 V rail bypass applications, with enough headroom for a 50 % voltage derating rule typical in tantalum designs — 10 V is a comfortable margin above a 5 V rail. ESR is 7 Ohm, a typical value for a small-case tantalum at this capacitance; it limits ripple current and self-heating, so the capacitor should not be used in high-ripple power-supply outputs without checking the ripple-current derating curve.