4.7 µF, 25 V, 900 mOhm — parametric fit for bulk decoupling
The TPSB475K025R0900: This TPS series molded tantalum delivers 4.7 µF capacitance at 25 V with a 900 mOhm ESR — a moderate ESR that balances ripple current handling against inrush energy absorption in power-supply output filters and local decoupling. The ±10% tolerance keeps the effective capacitance within a tight window across the rated voltage and temperature range, which matters for timing circuits or filter poles where the capacitor sets a corner frequency.
The molded package provides mechanical stability and moisture resistance; the B case footprint (3.50 mm × 2.80 mm, 2.10 mm seated height) is a standard tantalum outline that reuses existing layout patterns.