150 µF at 16 V — the BOM-fit anchor
That capacitance and voltage pair is the first check against your power-rail decoupling or hold-up capacitor BOM line — if the rail is 12 V nominal, the 16 V rating gives 33 % derating, which is standard practice for tantalum to avoid surge failures.
100 mOhm ESR and what it drives
For a buck converter output, lower ESR means less voltage ripple for the same ripple current — this part keeps the output clean without oversizing the ceramic bypass. At 100 mOhm, the capacitor can handle ripple currents typical of a 1–2 A DC-DC stage without exceeding the 125 °C max operating temperature.
2917 case — footprint and rework
Housed in the 2917 (7343 Metric) case, size code D, the capacitor measures 7.30 mm x 4.30 mm with a seated height of 3.10 mm.