What the 1 Ohm ESR means for your rail
The TPSA156K010T1000: At 100 kHz the ESR is 1 Ohm — that is the bulk of the AC loss in a switching regulator output filter. For a 15 µF cap at 10 V, the ripple current heats the part; the 1 Ohm ESR sets the self-heating ceiling and the ripple voltage you see on the rail.
The cap works in avionics cold-soak, satellite thermal cycling, and engine-bay heat without derating the voltage. The 1206 case keeps the footprint small, but the molded construction means the part is not hermetically sealed; in high-humidity environments a conformal coat is worth considering.
Active lifecycle — no LTB clock
Listed as Active on KYOCERA AVX's product status — no end-of-life notice, no last-time-buy deadline. The part is in standard production and can be ordered through independent distribution channels.