The TAJD106M025HNJ is a surface-mount molded tantalum capacitor from the KYOCERA AVX TAJ series, rated at 10 µF with a 25 V working voltage and ±20% tolerance. The 2917 (7343 Metric) case is the D-size footprint — a common decoupling and bulk-storage capacitor for power rails up to 25 V in industrial and automotive-adjacent designs.
ESR and temperature — the two numbers that matter for your rail
The 1.2 Ohm ESR at 100 kHz sets the ripple current capability and the self-heating under AC load. For a 100 kHz switching regulator output, that ESR translates to roughly 0.5 A ripple current before the internal temperature rise cuts into the 2000-hour lifetime at 125°C.