22 µF, 4 V molded tantalum — 0805 footprint, 5 ohm ESR
The TAJP226K004RNJ is a 22 µF, 4 V rated molded tantalum capacitor in the 0805 (2012 Metric) case size, part of the KYOCERA AVX TAJ series. The 5 ohm ESR (Equivalent Series Resistance) is the key parameter for ripple current handling and filtering effectiveness in a power rail — higher ESR means more self-heating and less attenuation of high-frequency noise.
In an engine-bay ECU or outdoor telecom module that sees 105°C ambient, the 125°C ceiling provides headroom. The molded case construction resists moisture and mechanical stress better than uncoated tantalum chips.
This is a standard production part, not a last-time-buy or obsolete line.