What the 250 mOhm ESR means for a 15 µF, 35 V tantalum
The TPSY156M035R0250: The 35 V rating gives a 1.46× derating factor on a 24 V rail — standard practice for tantalum to avoid surge failures. The 250 mOhm ESR sets the ripple current capability: at 100 kHz, the capacitor can handle roughly 1.1 A RMS before self-heating becomes a concern, making it suitable for output filtering on a buck converter feeding a moderate load. The 2917 (7343 Metric) case is the largest standard tantalum footprint, offering the lowest thermal resistance to the board. The seated height of 2.00 mm keeps it within typical component height limits for a 2-layer or 4-layer board.