2.2 µF / 35 V molded tantalum — B case
The TAJB225M035H is a molded tantalum capacitor from the KYOCERA AVX TAJ series, rated at 2.2 µF capacitance with a 35 V DC voltage rating and ±20% tolerance. The B case size (1411 / 3528 Metric) measures 3.50 mm × 2.80 mm with a seated height of 2.10 mm, fitting standard surface-mount footprints for this case code.
4.2 Ohm ESR — ripple current ceiling
The 4.2 Ohm equivalent series resistance sets the ripple current limit: at 100 kHz, the maximum allowable ripple current is roughly 100 mA RMS before self-heating raises the core temperature. For a 2.2 µF capacitor, this ESR is typical for a 35 V rated part in the B case, meaning the part is best suited for decoupling and filtering where ripple currents stay low.
-55 to 125 °C — military/industrial thermal range
The molded construction keeps the part sealed against moisture ingress across this range.