The TPSC686K016S0125: The ±10 % tolerance keeps the actual capacitance within a tight window for filter cutoff accuracy.
125 mOhm ESR — ripple current and filtering trade-off
125 mOhm ESR is a mid-range value for a 68 µF tantalum in a 2312 case. It handles ripple current without excessive self-heating while still providing enough damping to prevent resonance in a buck converter output filter.
Molded 2312 case — surface-mount footprint and storage note
The 2312 (6032 Metric) molded case measures 6.00 mm x 3.20 mm with a seated height of 2.80 mm. It is a standard surface-mount tantalum footprint shared across the TPS C-case family.
Full military temperature range — avionics and downhole fit
The ESR is specified at 25 °C; expect it to increase by roughly 2× at -55 °C and decrease by about 0.5× at 125 °C, which shifts the ripple voltage accordingly.