Bulk decoupling for a 20 V rail — what the ratings mean
The TPSV107K020R0100 is a 100 µF tantalum capacitor rated at 20 V with a 100 mOhm ESR. For a 20 V supply rail, the 20 V rating provides no de-rating margin — a 24 V or 48 V rail would need a higher-voltage part, but at 20 V nominal this capacitor sits right at its ceiling. The 100 mOhm ESR is the key figure for ripple handling: at 100 kHz switching frequency, the self-heating from ripple current is proportional to ESR, so a lower-ESR part (say 50 mOhm) would run cooler in a high-ripple SMPS output filter.
Temperature range and deployment context
Rated for -55°C to 125°C, this capacitor covers the full industrial and military temperature envelope. In an outdoor telecom power supply or an engine-bay ECU, the 125°C upper limit means it survives under-hood ambient without derating the capacitance below the datasheet floor. The molded case in the 2924 (7361 Metric) footprint — 7.30 mm x 6.10 mm with a 3.75 mm seated height — fits standard PCB land patterns for this case code.