The TAJD477M006RNJ: Rated 470 µF at 6.3 V, this is a bulk tantalum for 3.3 V and 5 V rails where you need a solid capacitance floor without the ESR creep of an aluminum electrolytic at cold temperatures. The ±20% tolerance is standard for tantalum — the actual capacitance at 6.3 V bias will sit near the nominal, but derate the applied voltage to 50 % of rated (3.15 V) for reliable operation per AVX application guidelines.
400 mOhm ESR — the thermal ceiling
400 mOhm ESR at 25 °C sets the self-heating under ripple current — for a 470 µF cap on a 500 mA buck output, the I²R loss is about 100 mW, which is manageable in free air but needs attention in a sealed enclosure. ESR rises at low temperature; at -55 °C it can be several times the 25 °C value, so a circuit that must start cold should budget for higher ripple voltage.
D-case 2917 — standard footprint
The 2917 (7343 Metric) D-case measures 7.30 mm x 4.30 mm with a seated height of 3.10 mm max — it matches the common D-case land pattern used across the TAJ series and many competitive tantalum lines.