68 µF bulk cap for low-voltage rails — what the ESR tells you
The TPSD686M016R0070: The 70 mOhm ESR is the figure that governs ripple current handling and self-heating — lower ESR means the cap absorbs less heat from the ripple current, extending life in a power supply that sees continuous AC content. The D case (2917 metric) is the standard footprint for this capacitance-voltage combination in the TPS series. The -55 to 125 °C operating range covers full industrial temperature — no derating needed down to -55 °C, though at the hot end the leakage current rises and the voltage derating factor per the manufacturer's recommendation should be applied.
Active production — no end-of-life pressure on this BOM line
Tolerance is ±20% — typical for tantalum electrolytics. The capacitance floor at -55 °C is within the same tolerance band, so a 68 µF nominal part delivers at least 54 µF across the full temperature range. For a timing circuit or filter pole that needs tighter accuracy, a ±10% or ±5% tantalum or MLCC alternative would be the correct choice.