The 4 V rating gives roughly 50 % derating on a 2.5 V rail, which is standard practice for tantalum to keep the DC bias stress within the safe operating area.
D-case 2917 footprint and temperature range
The D-case (2917 metric 7343) measures 7.30 mm x 4.30 mm with a seated height of 3.10 mm — a standard footprint shared across multiple manufacturers, so a second-source swap is straightforward if the BOM needs flexibility.
