100 µF at 10 V — bulk decoupling or hold-up
The TAJB107M010SNJ: The 10 V rating gives roughly 20 % derating on a 5 V rail — adequate margin for most industrial and telecom supplies.
1.4 Ohm ESR — ripple current and self-heating
ESR is specified at 1.4 Ohm at 100 kHz. For a power-stage output filter, the ESR dominates the output ripple voltage and the capacitor's own temperature rise. A lower-ESR part (e.g., 0.5 Ohm in the same case) would handle more ripple but costs more.
Molded case, size code B — 1411 / 3528 metric
Molded construction in the B case code (3.50 mm × 2.80 mm footprint, 2.10 mm seated height). The molded case provides consistent mechanical dimensions and good moisture resistance for reflow soldering. Surface-mount on a standard 1411 (3528 metric) pad layout — no special footprint beyond the datasheet land pattern.