The TAJR104M020RNJ is a molded tantalum capacitor from the KYOCERA AVX TAJ series, rated 0.1 µF at 20 V with ±20% tolerance. The 0805 package (2.05 mm x 1.30 mm footprint) is common enough that you can hand-solder it in the field with a standard iron — no hot-air station required. The 25 Ohm ESR is typical for a small-case tantalum at this capacitance and voltage; it limits ripple current capability, so this part is better suited for decoupling and timing circuits than for high-ripple power-supply filtering.
New designs and replacement orders are straightforward — no forced migration to a successor.
No stock-holding claim — quoted to order. RoHS compliance is standard for the TAJ series, but the evidence does not carry an explicit RoHS certificate for this order code. Confirm with the RFQ if your compliance audit requires a formal statement.