0.68 µF, 35 V — TAJ series molded tantalum in 1206
The TAJS684K035RNJ: This is a KYOCERA AVX TAJ series molded tantalum capacitor, rated 0.68 µF at 35 V with ±10% tolerance, in a standard 1206 (3216 Metric) surface-mount case. The 8 Ohm ESR at 25 °C sets the ripple current ceiling — for a given ripple current, the internal power dissipation is I² × 8 Ohm, and the temperature rise above ambient must stay within the 125 °C absolute limit.
Rated -55 to +125 °C, this capacitor covers the full industrial temperature band and the lower end of military/aerospace requirements — suitable for outdoor telecom, motor drives, and engine-bay electronics where the ambient stays below 125 °C.