22 µF, 6.3 V, 600 mOhm ESR — the ESR drives ripple current handling
The TAJW226K006RNJ: This is a 22 µF tantalum capacitor rated at 6.3 V with a 600 mOhm ESR. The ESR figure is the key spec for a decoupling or filtering role: it sets the ripple current the cap can absorb before self-heating forces derating. A 600 mOhm ESR at 22 µF means the cap handles moderate ripple; for a higher-ripple rail, a lower-ESR part like the TPS series would be the better fit.
The size code W package is 6.00 mm x 3.20 mm with a seated height of just 1.50 mm, which fits under a low-profile heatsink or a mezzanine board in a tight stack-up.