The TPSC157K006R0090 is a molded tantalum capacitor from KYOCERA AVX's TPS series, rated at 150 µF capacitance with ±10% tolerance and a 6.3 V DC voltage rating. Its 90 mOhm equivalent series resistance (ESR) is the dominant loss term for ripple current handling — lower ESR means less self-heating and better transient response on a power rail. The C case code (2312 / 6032 Metric) measures 6.00 mm x 3.20 mm with a seated height of 2.80 mm, fitting a standard footprint that is shared across multiple capacitance values in the TPS family.
At 125°C the rated voltage must be derated per the TPS series application guidelines; the 6.3 V rating at 25°C drops to roughly 4 V at the high end, so a 10 V rail would need a higher-voltage-rated part.