The TPSB157M004Y0250 is a molded tantalum capacitor from KYOCERA AVX's TPS series, offering 150 µF capacitance at a 4 V rating in a compact B case (1411/3528 Metric). With a 250 mOhm ESR, it handles ripple current in DC-DC converter output filtering or as bulk storage on a low-voltage rail — the ESR figure sets the ripple voltage and self-heating under load.
Surface-mount B case — footprint and layout fit
The B case measures 3.50 mm x 2.80 mm with a seated height of 2.10 mm, fitting standard 1411 (3528 Metric) pads. The molded package is compatible with reflow soldering and tape-and-reel handling for automated assembly. General-purpose tantalum — no special low-ESR or high-reliability screening. The ±20% tolerance is typical for bulk tantalum; for tighter output regulation, pair it with a ceramic cap in parallel.