What the 25-ohm ESR means for your circuit
The TAJR105K010RNJ: At 1 µF and 10 V, this TAJ-series tantalum carries a 25-ohm ESR — that is the effective internal resistance at 100 kHz. The 0805 case dissipates that through the board copper; keep the pad connected to a solid ground plane.
That makes it a fit for avionics power-supply filtering, downhole instrumentation, or satellite bus decoupling where the ambient swings from cold-soak to hot re-entry. The molded case keeps moisture out without conformal coat.