10 µF, 10 V, 1206 — the BOM-fit numbers
The TAJA106K010UNJ: This is a 10 µF ±10% tantalum capacitor rated at 10 V DC in the standard 1206 (3216 Metric) molded case. The manufacturer size code A means the case height is 1.80 mm seated — a common footprint that fits most 1206 land patterns without layout adjustment. For a 10 µF part in a 1206 case, this ESR is typical for the TAJ series; it sets the self-heating under AC ripple and the voltage ripple at the load.
AEC-Q200 and the 125°C endurance window
The 125°C upper limit is the absolute maximum ambient; derating the applied voltage below 10 V extends the useful life at high temperature.