220 µF, 10 V, 100 mOhm ESR — output filter for a 10 V rail
The 100 mOhm ESR at 100 kHz is the key parametric for a switching-regulator output filter: at 500 kHz ripple, the ESR dominates the output ripple voltage, and 100 mOhm keeps the ripple within a few tens of millivolts for a 1 A load step. The 2917 (7343 Metric) case size (7.30 mm × 4.30 mm footprint, 3.10 mm seated height) is a standard tantalum footprint that matches the common D-size case code. The molded construction gives consistent mechanical dimensions and a flat top for pick-and-place vacuum pickup.
In an avionics power supply that sees -55°C cold soak on the tarmac and +125°C near the engine firewall, the capacitance and ESR stay within datasheet limits without derating.