The 50 V rating gives headroom on a 12 V or 24 V bus — the derating rule for tantalums (50 % of rated voltage for reliability) still leaves 25 V working, which covers most industrial rails without a second voltage derating step.
5.5 Ohm ESR — what it means for ripple
For a 100 kHz buck converter, the capacitor's self-heating limits ripple current to roughly 200 mA RMS — above that the internal temperature rise accelerates wear. Use this part as a bulk decoupling cap on a low-ripple rail or as a filter cap after an LDO, not as the sole output cap on a high-ripple switching supply.
Active — orderable through distribution
KYOCERA AVX continues production of the TAJ series in this case size.
