This TAJA226M006RNJ is a molded tantalum capacitor from the KYOCERA AVX TAJ series, rated 22 µF at 6.3 V with a 3 Ohm ESR in a 1206 (3216 Metric) case. The 3 Ohm ESR is the key thermal and ripple-current limiter — on a 1.8 V or 3.3 V rail, it handles the typical decoupling duty without exceeding the 125°C ceiling, but the ripple current at the switching frequency should be checked against the ESR derating curve.
For a 1206 case, the capacitance tolerance is ±20%, which is typical for tantalum and acceptable for bulk decoupling — the ESR dominates the impedance at the switching frequency, not the absolute capacitance.