The TPSD157K006R0050: You can commit this BOM line without worrying about a forced redesign inside the product's production run.
50 mOhm ESR and what it buys you
The 50 mOhm ESR is the headline spec that matters for power rail filtering. A low ESR means less self-heating under ripple current — for a 150 µF cap on a 6.3 V rail, the ripple voltage at the switching frequency stays tighter, and the capacitor runs cooler inside the 2917 package. That directly extends lifetime in a 125°C ambient.
Military temp range — deployment fit
The molded case handles thermal cycling without cracking the dielectric — a failure mode you see in conformally-coated tantalums on rework.
Package and footprint — 2917 (7343 Metric)
The 2917 case size (7.30mm x 4.30mm, 3.10mm seated height) is a standard tantalum footprint. The D-size code means the pad layout is shared with many TPS-series siblings, so a board already routed for a D-case cap accepts this part without a layout change. The molded body has no exposed metal edges — no risk of shorting to adjacent components during reflow.
The TPS series is a standard tantalum line — KYOCERA AVX runs it in volume, so lead times are typically consistent.