150 mOhm ESR — the number that governs ripple and temperature
The TPSD476M025R0150: The 150 mOhm equivalent series resistance is the spec that determines how much ripple current the capacitor can handle before self-heating becomes a derating issue. For a 47 µF part at 25 V, this ESR is typical of the standard TPS series — not the ultra-low-ESR variant, but low enough for most DC-DC output filtering and bulk storage applications where the ripple frequency is in the 100 kHz to 1 MHz range. At 150 mOhm, the self-heating at 1 A ripple current is I²R = 0.15 W. In a 2917 case on a standard PCB footprint, that keeps the temperature rise under 10°C in still air — well within the -55°C to 125°C operating range.
Tolerance and temperature grade
The ±20% tolerance is standard for tantalum electrolytics — the actual capacitance at 25 V bias will be at the low end of the band, so budget the minimum 37.6 µF for timing or filter cutoff calculations. The -55°C to 125°C operating range covers industrial and military temperature grades, meaning this part survives cold-soak and hot-bench environments without parametric drift outside the datasheet limits.