10 µF, 10 V, 1.8 Ohm ESR — what this means for your rail
The TPSA106K010T1800: This is a 10 µF molded tantalum capacitor rated at 10 V with a 1.8 Ohm ESR at 100 kHz. The 1.8 Ohm ESR sets the ripple attenuation floor: at the switching frequency of a typical buck converter (say 500 kHz), the impedance is dominated by the ESR, so the ripple voltage is roughly I_ripple × 1.8 Ohm. Keep that in mind when sizing the output cap for your DC-DC.
No need to rush a last-time-buy or hunt for a second source — this part is a stable BOM line.
Molded tantalum in 1206 — board-fit and thermal envelope
The 1206 (3216 Metric) case measures 3.20 mm × 1.60 mm with a seated height of 1.80 mm. That is a standard footprint for bulk decoupling on dense PCBs — the 1206 pad layout is well-supported in most assembly houses. The molded construction gives mechanical robustness against vibration and thermal cycling.