The TAJB225K025H: At 2.2 µF with ±10% tolerance, this cap is a standard decoupling or filter value for low-frequency bypass on 12 V or 5 V rails — the 25 V rating gives 2× derating margin on a 12 V rail, which keeps the failure rate low in tantalum. The 4.5 Ohm ESR is on the higher side for a 2.2 µF tantalum — expect more self-heating under ripple current than a low-ESR polymer would deliver. That matters if the cap sits on a switching regulator output with significant AC content.
Molded case, size code B — footprint and temperature range
Molded construction in the 1411 (3528 Metric) / 1210 case, size code B, with dimensions 3.50 mm x 2.80 mm and seated height 2.10 mm.