0.68 µF, 20 V — molded tantalum for decoupling and filtering
The TAJR684K020RNJ is a molded tantalum capacitor from the KYOCERA AVX TAJ series, rated at 0.68 µF capacitance with a 20 V working voltage and ±10% tolerance. The 20 ohm ESR is a design consideration: at higher ripple currents the self-heating adds to the ambient temperature, so derate the ripple current per the manufacturer's curve when pushing the part near its thermal limit.
