The TAJR224M035RNJ: This is a TAJ-series molded tantalum capacitor from KYOCERA AVX, rated 0.22 µF at 35 V with ±20% tolerance. The 0805 package (2.05 mm × 1.30 mm footprint, 1.20 mm seated height) suits compact surface-mount designs where board space is tight. Operating from -55°C to 125°C, it covers military-temperature applications — avionics, satellite power buses, downhole instrumentation — where the 35 V rating provides margin on a 12 V or 24 V rail.
21 Ohm ESR — the trade-off you need to budget
With 21 Ohm ESR, this part is not a first choice for high-ripple-current decoupling on a switching regulator output — the ESR limits ripple current to a few tens of mA before self-heating becomes a concern. It works well as a bulk storage cap on a low-noise analog rail or as a timing/RC element where the ESR is part of the circuit equation.
The product status is Active. KYOCERA AVX continues production. Order against your BOM quantity without rush.