The 15 µF and 35 V together define the energy storage for a 3.3 V or 5 V rail — the voltage margin is generous, so no derating worry on a 12 V bus.
That means it works in avionics cold-soak, engine-bay heat, and downhole environments without a derating curve — the same part serves a satellite payload and a factory-floor motor drive.
D case 2917 — footprint and layout
Manufacturer size code D, which maps to the 2917 (7343 metric) case: 7.30 mm x 4.30 mm footprint, 3.10 mm seated height. The molded body is a standard reflow profile part — no special handling beyond the usual tantalum bake-out if the reel has been exposed to moisture.