The TAJD227K010RNJ: ESR is 500 mOhm, which sets the ripple current rating and output voltage ripple — for a 100 kHz buck converter drawing 1 A ripple, the ripple voltage across the cap alone would be 500 mV peak-to-peak, so this part suits lower-frequency decoupling or bulk storage where ripple is less critical.
The 125°C upper limit means it can sit next to a hot regulator without derating the voltage.
2917 (7343 Metric) case — D size
Standard 2917 (7343 Metric) molded case, size code D — 7.30 mm x 4.30 mm footprint, 3.10 mm seated height. Surface-mount, compatible with standard reflow profiles.