150 µF, 70 mOhm ESR — the bulk decoupling cap that doesn't cook the board
The TPSC157K004R0070: The 70 mOhm ESR on this TPS-series tantalum means it handles ripple current in a 4 V rail without the self-heating that pushes a higher-ESR cap past its derating curve. At 150 µF and ±10% tolerance, it is a common choice for output filtering on a 3.3 V or 1.8 V switching regulator where the inductor ripple current needs a low-impedance sink. Molded case, size C (2312 metric) — the 6.00 mm × 3.20 mm footprint is standard for this capacitance and voltage rating.
The product status is Active — KYOCERA AVX is still manufacturing this order code. For a BOM that depends on this specific capacitance, voltage, and ESR combination, the supply chain is stable through independent distribution.
-55 to 125 °C — military-temperature tantalum
The molded case keeps moisture ingress low during thermal cycling.