ESR and temperature — the real selection drivers
The TPSD336K025R0300: For a 33 µF cap on a 500 kHz buck converter output, this ESR keeps the I²R losses within the package's thermal budget — a lower ESR would run cooler but a higher one would push the core temperature above the 125°C ceiling. The -55°C to 125°C operating range covers industrial enclosures and under-hood automotive environments. The D-case (2917 / 7343 metric) footprint is a standard tantalum capacitor size, so the PCB land pattern is well-established and the part is easy to source as a replacement.
The manufacturer is KYOCERA AVX, and the part carries the TPS series designation for general-purpose molded tantalum applications. Compliance documentation (RoHS, REACH) is typically available from the manufacturer's datasheet or upon request.