The TAJD227M006RNJ is a molded tantalum capacitor from the KYOCERA AVX TAJ series, offering 220 µF capacitance at a rated voltage of 6.3 V with ±20% tolerance. This combination is a common choice for bulk decoupling on low-voltage digital rails where the capacitor must hold up charge during transient load steps without exceeding the voltage derating rule of thumb for tantalum.
900 mOhm ESR and the ripple-current ceiling
The molded case construction keeps the mechanical integrity across the range, but the leakage current and ESR both increase at the hot end — a 125°C ambient leaves no margin for self-heating, so the applied voltage should be derated further.