The TAJD156K025RNJ: This is a molded tantalum capacitor from the TAJ series, rated 15 µF at 25 V with ±10% tolerance and 1 Ohm ESR. It sits in the 2917 (7343 Metric) D-case — a standard footprint for this capacitance and voltage class, commonly used for bulk decoupling on 12 V rails or output filtering in DC-DC converters.
The 1 Ohm ESR is specified at 25°C; expect ESR to rise at cold temperatures and drop as the part warms — factor that into ripple-current derating if the rail sees wide temperature swings.
Surface-mount 2917 D-case — rework notes
Package is 7.30 mm x 4.30 mm, seated height 3.10 mm max. Orientation is marked with a stripe on the positive end; the part is polarised, so verify polarity before reflow.