1 µF at 20 V — the derating floor for a 1206 tantalum
The TAJA105K020RNJ: This is a 1 µF molded tantalum capacitor rated for 20 V continuous, in the standard 1206 (3216 Metric) footprint. The ±10% tolerance holds the nominal value across the full -55 to 125 °C military temperature band — that temperature grade puts it in avionics, satellite, and downhole gear where a commercial-grade cap would drift or fail.
9 Ohm ESR — the thermal and ripple limit
The 9 Ohm maximum ESR sets the self-heating floor. For a 1 µF part at 20 V, this ESR is typical of the A case size in the TAJ series — it handles modest AC ripple but won't serve as a high-frequency bulk decoupling cap where lower ESR (sub-ohm) is needed. Keep the RMS ripple current below the thermal derating curve for the 1206 body.