15 µF, 10 V, 2 Ω ESR — the ESR drives the ripple current ceiling
The TAJS156K010RNJ is a 15 µF ±10% molded tantalum capacitor rated at 10 V DC, with a 2 Ω ESR specified at 100 kHz. The ESR value is the key derating parameter: at a given ripple current, the I²R self-heating raises the internal temperature, and above 125 °C the leakage current accelerates wear-out. For a 1206 case with a 1.20 mm seated height, the thermal mass is small — the ESR limits the usable AC current to roughly 250 mA RMS before the part exceeds a 20 °C temperature rise above ambient.
For an avionics power rail that sees -40°C cold-soak at altitude and +105°C under the equipment bay, the part stays within its operating envelope with margin. The molded case construction (Type Molded) handles the thermal cycling stress better than conformal-coated chips — the epoxy encapsulant has a CTE closer to the tantalum slug, reducing die-attach fatigue over 1000+ cycles.
Active lifecycle — no LTB clock
The BOM line is stable for new production builds; no last-time-buy window to manage.