This TAJA225M010HNJ is a 2.2 µF tantalum capacitor rated at 10 V — the two numbers that decide whether it fits the rail voltage and the decoupling budget on your BOM. Tolerance is ±20%, which is standard for molded tantalum chips — the actual capacitance at the rail sits between 1.76 µF and 2.64 µF, wide enough that you do not want it near a timing or filter pole without margin.
125°C endurance and the deployment envelope
The part is comfortable in an engine-bay ECU, an industrial motor drive enclosure, or a downhole sensor module where ambient hits triple digits.
ESR and the decoupling trade-off
7 Ohm ESR at 100 kHz — that is on the higher side for a 2.2 µF cap, which means it will self-heat more under ripple current than a low-ESR polymer part would. Fine for bulk decoupling on a 10 V rail where ripple is modest; less ideal as a high-frequency bypass on a switching regulator output.
Lifecycle status is Active — KYOCERA AVX is still manufacturing this TAJ series code. No last-time-buy deadline to manage; you can quote it for new builds and spares alike. The 1206 (3216 Metric) molded case, size code A, is a common footprint — the 3.20 mm x 1.60 mm body and 1.80 mm seated height fit standard pick-and-place without a nozzle change.