The TAJA684K025RNJ is a molded tantalum capacitor from the KYOCERA AVX TAJ series, rated at 0.68 µF capacitance with ±10% tolerance and a 25 V DC voltage rating. Its 10 Ohm equivalent series resistance (ESR) sets the ripple-current handling and self-heating limit — a factor in power-supply decoupling and output filtering where the ripple current times ESR stays within the thermal budget.
Housed in a 1206 (3216 Metric) surface-mount package measuring 3.20 mm x 1.60 mm with a seated height of 1.80 mm max, it fits standard 1206 pads with no special fan-out or via-in-pad requirements. Manufacturer size code A indicates the smallest case size in the TAJ series — check the pad geometry against your reflow profile; the molded body is compatible with standard lead-free soldering processes.