6.8 µF, 16 V — the BOM-fit check
The TAJB685K016RNJ: This is a 6.8 µF tantalum capacitor rated at 16 V with ±10% tolerance — the first check is whether the rail or coupling node sees more than 16 V steady-state or any transient that exceeds the derating guideline (typically 50 % of rated voltage for tantalum). The ESR is 2.5 Ohm, which caps the ripple current the part can handle before self-heating becomes a concern; for a 100 kHz switching node, the AC ripple current should stay below the thermal limit implied by that ESR.
Housed in a 1411 (3528 Metric) molded case, size code B, with dimensions 3.50 mm x 2.80 mm and a seated height of 2.10 mm max — the footprint matches the standard 1210 land pattern, so existing pads for a 1210 tantalum cap accept this part without a layout change.
No stock-holding claim — this is a quoted-to-order line.