The 1206 (3216 Metric) case size is the footprint constraint — the 3.20 mm x 1.60 mm land pattern matches standard 1206 solder pads, so no layout change from a generic 1206 ceramic cap, though the seated height of 1.80 mm is taller than most MLCCs at the same footprint. For a 22 µF output filter on a 500 kHz buck converter, the impedance at the switching frequency is dominated by the ESR, not the capacitance — expect about 3 Ohm of damping, which limits the ripple voltage to I_ripple × 3 Ohm. If the load transient demands lower ESR, a polymer or multi-layer ceramic alternative would be needed.
Tantalum capacitors are polarity-sensitive — the molded case is marked with a stripe on the positive (anode) end. Reversing the voltage will cause catastrophic failure. Confirm the board silkscreen orientation matches the anode mark before reflow.
RoHS compliance is standard for the TAJ series. The part ships on tape and reel per the package listing, which is the typical supply format for 1206 case sizes in volume assembly.