What this molded tantalum cap does for your rail
The TPSB106K020R1000: At 10 µF and 20 V rated, this TPS-series part sits in the sweet spot for a 3.3 V or 5 V rail decoupling bank where you need more margin than a 16 V cap gives — the 20 V rating covers a 12 V input transient without derating stress. The 1 Ohm ESR is typical for a size-B molded tantalum at this capacitance; it limits ripple current but keeps the self-heating under control in a 125°C ambient, which is the full temperature range of this part.
Size code B lands on a 1411 (3528 Metric) footprint — the 3.50 mm x 2.80 mm body with a 2.10 mm seated height fits under low-profile mezzanine boards or in tight PWB stacks.