Bulk decoupling on a 10 V rail — what the ratings mean
The TPSW476M010R0250: The ±20% tolerance means the actual capacitance can range from 37.6 µF to 56.4 µF. For a bulk decoupling application where the minimum capacitance at the regulator's output must stay above a certain value, design the derating around the low end of the tolerance band.
Temperature range and deployment fit
Rated for -55°C to 125°C, this capacitor covers the full industrial temperature range and extends into the automotive under-hood band. The capacitance and ESR shift with temperature — at -55°C the ESR typically rises, so the ripple current capability at cold start is lower than at 25°C. If the circuit must pass a cold-crank test at -40°C, the 125°C ceiling provides margin above the 105°C ambient often seen near an engine-bay ECU.
Package and PCB footprint
The low profile — under 1.6 mm — fits under a heatsink or on the back side of a densely populated board where vertical clearance is tight. The size code W is the standard footprint for this capacitance and voltage rating in the TPS series; the pad layout matches the EIA-535BAAC standard for 2312 tantalum chips.