The 900 mOhm ESR at 100 kHz defines the ripple current handling and the self-heating under AC load — for a low-voltage rail (e.g., 1.8 V or 2.5 V core supply), the 4 V rating provides derating margin against voltage surges. The molded case (size code X, 7.30 x 4.30 x 1.50 mm) fits the standard 2917 (7343 Metric) footprint and is compatible with reflow soldering.
Footprint and mounting for the 2917 case
The molded body is non-hermetic — conformal coating is recommended if the board operates in condensing humidity.