The TAJR685M004RNJ: This is a molded tantalum capacitor from the TAJ series, rated 6.8 µF at 4 V with an 8 Ohm ESR in an 0805 case.
The ESR and capacitance shift with temperature — the 8 Ohm figure is at 25°C; expect higher ESR at -55°C and lower at 125°C, but the part stays within the ±20% tolerance band across the range.
0805 footprint — board layout and rework
The 0805 (2012 Metric) case measures 2.05 mm x 1.30 mm with a seated height of 1.20 mm. Standard reflow profile for tantalum applies — preheat at 150°C, peak at 260°C, with a 30-second max above 217°C. The molded body is moisture-sensitive; bake at 125°C for 24 hours if the shelf life has been exceeded.