The TPSD687K004R0100 is a 680 µF tantalum capacitor in a molded 2917 (7343 Metric) package, rated at 4 V with a ±10% tolerance. The 100 mOhm ESR at 100 kHz sets the ripple-current ceiling and the self-heating under AC load — a lower ESR means less internal temperature rise for the same ripple, which matters in a power-supply output filter where the cap sees the switching ripple directly.
Temperature range and operating environment
The 125°C upper limit means it can sit near a hot MOSFET or regulator without derating — but tantalum capacitors lose capacitance and increase leakage at the high end, so the actual ripple current at 125°C must be checked against the voltage-derating curve for the series.
Package and footprint — 2917 case D
The standard tantalum footprint uses a 2.8 mm pad spacing with adequate thermal relief to the cathode pad — the molded body is moisture-sensitive, so bake before reflow if the shelf-life window is exceeded.