The TAJC686K006RNJ is a molded tantalum capacitor from the TAJ series, rated 68 µF at 6.3 V with ±10% tolerance and a 1.5 Ohm ESR. This combination suits it for bulk decoupling on 3.3 V or 5 V power rails where the 1.5 Ohm ESR limits ripple current self-heating — a typical 100 kHz buck converter ripple of 500 mA produces a 0.375 W dissipation, well within the package's thermal budget at 85°C ambient. The 2312 (6032 Metric) case measures 6.00 mm x 3.20 mm with a seated height of 2.80 mm, fitting standard 12 mm tape-and-reel formats for automated pick-and-place.
In an avionics power supply that sees -40°C cold-soak and +105°C internal ambient, the capacitor's capacitance and ESR remain within datasheet limits across the entire range — no derating required until the 125°C ceiling.
The TAJ series is a long-running molded tantalum line with no announced discontinuation.