150 µF output cap with 50 mOhm ESR — what it buys you
The TPSC157M006R0050: This is a 150 µF, 6.3 V molded tantalum capacitor from the TPS series, with a 50 mOhm ESR. The low ESR is the headline number for a power rail: it sets the ripple-current rating and the self-heating under load. For a 500 kHz buck converter output, 50 mOhm ESR keeps the ripple voltage below 10 mV with 1 A of ripple current — a solid fit for a POL regulator feeding a 1.8 V core rail.
Temperature range — -55 to +125 °C
In an avionics power supply that sees -40 °C cold soak and +105 °C under full load, the 125 °C ceiling gives 20 °C of margin. The molded case (size C, 6.00 x 3.20 mm footprint) handles the thermal cycling without cracking the dielectric — a known failure mode in uncoated tantalums.