0.68 µF, 25 V — the ratings that define the BOM line
The TAJA684K025HNJ is a 0.68 µF tantalum capacitor rated at 25 V, from KYOCERA AVX, in a Tape & Reel package. These two numbers — capacitance and voltage — are what a buyer checks first when confirming a BOM position: 0.68 µF for the decoupling or timing role, and 25 V for the rail it sits on. A 25 V rating gives headroom on a 12 V or 5 V supply, but on a 24 V rail with ripple, the derating margin narrows — tantalum capacitors typically need 50 % voltage derating for reliable operation, so a 25 V part on a 24 V rail is at its limit.