The TAJS685K004RNJ is a molded tantalum capacitor from the KYOCERA AVX TAJ series — 6.8 µF capacitance, 4 V rated voltage, ±10% tolerance, in a standard 1206 (3216 metric) surface-mount package. The 8 Ohm ESR is typical for this case size and capacitance; it means the cap handles moderate ripple but isn't a low-ESR choice for high-frequency decoupling near a fast-switching regulator.
Package and footprint notes for the bench
1206 case (3.20 mm x 1.60 mm footprint, 1.20 mm seated height) — a common size that fits standard pick-and-place and reflow profiles. The manufacturer size code is S.