ESR at 100 kHz — the ripple-current ceiling
At 125 °C ambient, the 2000-hour lifetime rating assumes the capacitor is operated within its ripple-current derating — push the RMS current above the calculated I²R limit and the core temperature rise accelerates the electrolyte dry-out.
Case size and board-fit
The A-size code maps to a 1206 (3216 metric) footprint: 3.20 mm x 1.60 mm, seated height 1.80 mm max. The molded case provides a flat top for pick-and-place nozzle vacuum and a consistent stand-off height under the component body.
The TAJ series is a broad, mature portfolio; production continuity is typical for this family.