Bulk capacitance for 35 V rails
The TPSD685M035R0150: The 35 V rating provides margin on a 24 V or 28 V rail — a 12 V rail would leave headroom for transients, but the capacitance density at 35 V is lower than a 16 V or 20 V rated part of the same case size. For a 5 V rail, this part is over-specced on voltage and a lower-voltage TPS series part would offer higher capacitance in the same footprint.
D case footprint and temperature range
The molded construction gives the capacitor mechanical rigidity during reflow and in-service vibration — the epoxy case resists cracking from board flex better than an uncoated chip.