22 µF, 35 V, 200 mOhm — the ESR that sets the ripple budget
The 200 mOhm ESR at 25 °C is the primary thermal constraint — it determines how much ripple current the part can handle before self-heating pushes the internal temperature above the 125 °C ceiling. For a 100 kHz switching rail, a 1 A ripple current would dissipate 200 mW inside the part; at that rate the temperature rise can exceed 20 °C in still air, so the derating curve in the datasheet should be checked against the actual load.
D case, 2917 footprint, -55 to +125 °C
The D case (2917 metric, 7.30 mm x 4.30 mm, 3.10 mm seated height) is a common footprint for 22 µF to 47 µF tantalum capacitors at 35 V. The -55 to +125 °C operating range qualifies it for military/aerospace temperature extremes — avionics power supplies, satellite bus filtering, and downhole logging tools where the ambient hits 105 °C and the self-heating from ripple adds another 15–20 °C.
Active production — no obsolescence clock
Procurement can source this part through independent distribution without a deadline-driven premium.