2.2 µF / 35 V — the BOM-fit pair
This TAJA225K035RNJ is a 2.2 µF tantalum capacitor with a 35 V DC rating, housed in the standard 1206 (3216 Metric) case. The ±10% tolerance covers the common decoupling and filtering roles where the nominal value sits inside the design margin.
4.5 Ohm ESR — what it means for ripple
The 4.5 Ohm equivalent series resistance is the dominant loss term. Ripple current self-heating must be checked against the 1206 case's dissipation capability.
The molded case and tantalum construction handle the thermal cycling typical of avionics, satellite, and downhole instrumentation without the capacitance drift seen in electrolytic alternatives at the cold end.