68 µF bulk decoupling for 12 V rails
The TAJC686M016RNJ: Rated 68 µF at 16 V with a 1.3 Ohm ESR, this TAJ-series molded tantalum handles the ripple current from a 12 V buck converter output or a 5 V rail with plenty of headroom — the 16 V rating gives 33 % derating margin on a 12 V rail, which is the standard practice for tantalum reliability.
Case C 2312 footprint and reflow profile
Surface-mount in a 2312 (6032 Metric) case, size code C, measuring 6.00 mm x 3.20 mm with a seated height of 2.80 mm — this is a standard tantalum footprint that matches many existing board layouts without a pad respin.