The TAJW227K004RNJ is a molded tantalum capacitor from the KYOCERA AVX TAJ series, rated 220 µF at 4 V with ±10% tolerance. The 2312 (6032 Metric) case fits standard pick-and-place reels and is a common footprint for board-level energy storage or bulk decoupling where the voltage rail stays below 4 V.
In a low-frequency smoothing or hold-up capacitor role the dissipation stays manageable, but in a high-ripple switching regulator output this part will self-heat more than a low-ESR polymer would.
