22 µF, 25 V, 200 mOhm — what the ESR means for the rail
The TPSD226K025R0200: The 200 mOhm ESR at 25 °C and 100 kHz sets the ripple current ceiling for this 22 µF, 25 V molded tantalum in a D case 2917. Higher ripple current raises internal temperature; the ESR derates with temperature, so the self-heating margin shrinks as ambient climbs toward 125 °C.
Active production — no obsolescence scramble
D case 2917 — board footprint and temperature grade
Surface-mount 2917 (7343 metric), 7.30 x 4.30 mm, seated height 3.10 mm max.