15 µF, 20 V, 1.7 Ohm — what the ratings drive
The TAJC156M020SNJ: At 15 µF and 20 V rated, this C-case molded tantalum provides bulk decoupling for a 12 V or 5 V rail with margin for transients; the 1.7 Ohm ESR sets the ripple current capability and self-heating under AC load.
Package and footprint — C-case 2312
Molded C-case measures 6.00 mm x 3.20 mm with a seated height of 2.80 mm max — the 2312 footprint is common across the TAJ series, so a single PCB land pattern serves multiple capacitance/voltage variants.