The TAJE477M004RNJ is a 470 µF molded tantalum capacitor rated at 4 V, ±20% tolerance, in the 2917 (7343 Metric) case size — the E code size for the TAJ series.
500 mOhm ESR — ripple current and self-heating budget
ESR is 500 mOhm, which sets the ripple current capability — at 85°C ambient, the maximum allowable ripple current is roughly 1.2 A RMS before self-heating raises the internal temperature above the 125°C ceiling. For a 100 kHz buck converter output, this ESR contributes about 0.3 W of loss at 0.8 A ripple, which the part can handle without derating.
Active — no LTB window to manage
This cap is suitable for avionics power supplies, satellite bus decoupling, downhole instrumentation, or any environment where the board sees temperature extremes. The 125°C upper limit means the part can sit next to a hot processor or power inductor without forced airflow.