The TAJA686K002RNJ packs 68 µF of capacitance into a 1206 (3216 Metric) molded case — a density that suits tight board layouts where a larger 1210 or 2312 case won't fit. The 2.5 V rating limits it to 1.8 V or 2.5 V rails; do not use on 3.3 V or higher supplies. ESR is 1.5 Ohm — typical for a size-A tantalum at this capacitance. Budget the ripple current heating: at 100 kHz, the self-heating from 500 mA ripple is about 0.375 W, which raises the internal temperature above ambient. Derate voltage by 20% for best reliability on low-impedance rails.
The molded case handles humidity and vibration better than conformally-coated parts.
This part can be designed in today with confidence that it will be available for the next several years.