22 µF, 35 V, 300 mOhm ESR — bulk decoupling for 12 V rails
The 35 V rating gives comfortable headroom on a 12 V rail — even with a 20 % overvoltage transient the capacitor stays below 80 % of rated voltage, which is the typical derating guideline for tantalum. The 300 mOhm ESR limits ripple current heating. For a 100 kHz buck converter output, the ripple current rating is roughly 1.2 A RMS — enough for a 5 W load at 12 V without exceeding the 125 °C ceiling.
KYOCERA AVX lists the TPSD226M035Y0300 as Active.
The 2917 (7343 Metric) case with D size code means 7.30 mm x 4.30 mm footprint and 3.10 mm max seated height. This is a standard tantalum outline — layout reuse across AVX TPS, Kemet T491, or Vishay 293D is straightforward, though the height may conflict with sub-3 mm enclosures.