The TPSD156K025R0100: The part is still in standard production, so you can order it against a BOM line without worrying about a forced redesign window.
100 mOhm ESR keeps ripple in check
The 100 mOhm equivalent series resistance is the key loss spec for a 15 µF output filter. On a 25 V rail switching at a few hundred kHz, that ESR limits the ripple voltage to a few tens of millivolts — the cap won't run hot or eat into the regulator's phase margin.
Full military temp band — -55 to 125 °C
Rated from -55 to 125 °C, this is the full military / avionics temperature grade. The molded TPS series handles the thermal cycling of an engine bay or a satellite power bus without the capacitance drop that commercial tantalums show at cold extremes.
D case 2917 — footprint and rework
The D case code maps to the standard 2917 (7343 Metric) footprint: 7.30 mm x 4.30 mm, seated height max 3.10 mm. Surface-mount, tape-and-reel or cut-tape. The molded body reflows cleanly with a standard lead-free profile; no special bake-out required unless the reel has been open longer than the floor-life rating.