22 µF bulk decoupling on a 35 V rail
The TPSY226M035R0200: That ESR figure governs ripple handling and transient response — at 100 kHz, the impedance is dominated by the 200 mOhm resistance, not the capacitive reactance, so the capacitor's ability to absorb switching noise is limited by that series resistance. The 35 V rating provides margin on a 24 V or 28 V rail; on a 12 V rail the derating is generous, which reduces the applied voltage stress and improves long-term reliability in the tantalum dielectric.
Footprint and temperature grade
The Y-size code indicates the standard 2917 footprint — the pad layout matches the common 7343-20 land pattern used across the TPS series. The -55°C to 125°C operating range covers industrial and automotive ambient conditions. At the high end, the 200 mOhm ESR limits self-heating; the derating curve for applied voltage versus temperature should be observed above 85°C to stay within the safe operating area of the tantalum anode.
The TPS series includes multiple capacitance and voltage variants in the same footprint — a parametric search on 2917 case, 35 V, and ±20% tolerance will surface alternative capacitance values if the 22 µF value is not critical.