Molded tantalum, 47 µF, 10 V — ESR is the derating anchor
The 250 mOhm ESR at 100 kHz is the parameter that governs ripple current handling and self-heating — for a 47 µF part at 10 V, a 250 mOhm ESR means the capacitor can dissipate roughly 0.4 W before the internal temperature rise exceeds the derating curve. In a low-ripple decoupling application the ESR is less critical; in a switching-regulator output filter it sets the output ripple voltage directly.
B case, 1411/1210 footprint — board layout fit
Manufacturer size code B, fitting the 1411 (3528 Metric) and 1210 case codes. Board footprint is 3.50 mm x 2.80 mm with a seated height of 2.10 mm max. The molded package is a standard reflow-solder profile part; no special moisture sensitivity level is listed, but a 24-hour bake at 125 °C before reflow is prudent if the reel seal is broken and the parts have been exposed to ambient humidity for more than 72 hours.
The capacitance tolerance of ±20% holds across the full temperature range, though the ESR will increase at low temperature and the leakage current rises at high temperature — budget those shifts in the derating calculation.