The 350 mOhm ESR is the figure that governs output ripple on a regulator or DC-DC bus — at a 100 kHz switching frequency and 1 A ripple current, expect roughly 350 mV pk-pk ripple from the ESR alone, before the capacitance term.
Active — quoted to order
The molded Case C (2312) package is a standard footprint — no board spin required for a like-for-like replacement.
Full military temperature band
This cap can sit on an avionics power bus, a downhole tool that sees 125 °C ambient, or a satellite EPS rail where the thermal cycle is severe. The molded construction and general-purpose feature set mean it is not a low-ESR automotive or high-reliability screened part — it is the workhorse bulk tantalum that fits most industrial and aerospace boards that do not require a specific qualification program.