68 µF, 6.3 V, 900 mOhm ESR — TAJD686K006SNJ fit check
The TAJD686K006SNJ is a molded tantalum capacitor from the KYOCERA AVX TAJ series, rated at 68 µF with ±10% tolerance and a 6.3 V DC voltage rating. This is the headline capacitance and voltage that define its position in a DC-DC output filter or power rail bypass application. The 900 mOhm ESR at 100 kHz sets the self-heating under ripple current — for a 500 mA ripple at 100 kHz, the power dissipation is roughly 225 mW, which the 2917 package can handle with adequate PCB copper area.