What the ESR and temperature range mean for your rail
The TPSB226K010T0400: The 400 mOhm ESR at 100 kHz sets the ripple current ceiling — on a 10 V rail switching at 500 kHz, the I²R loss in the cap determines the self-heating, not the ambient. Stay below the ripple current rating in the datasheet or the internal temperature rise accelerates wear-out. The capacitance shift over temperature is typical for MnO₂ tantalum; the ESR rises at cold, so budget more ripple margin at low temperature.
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Molded case, size code B, 1411 (3528 Metric) footprint: 3.50 mm x 2.80 mm, seated height 2.10 mm max. The ±10% tolerance on 22 µF means the actual capacitance at 0 V bias is between 19.8 µF and 24.2 µF — a DC bias derating curve applies; at 10 V the effective capacitance drops roughly 20% for this dielectric, so the rail sees ~17.6 µF under full bias.