Capacitance, voltage, and ESR — the three numbers that size the BOM line
The TAJT156M006RNJ: This is a 15 µF tantalum capacitor rated at 6.3 V with ±20% tolerance — the capacitance and voltage are the first check against the rail and bulk decoupling need. The 3.5 Ohm ESR (Equivalent Series Resistance) is the spec that drives ripple current handling and self-heating; at this ESR, the part is suited for general-purpose decoupling and filtering where low impedance is not the primary requirement.
The molded case and surface-mount 1411 (3528 Metric) footprint (3.50 mm x 2.80 mm, seated height 1.20 mm) fit standard PCB layouts; the T case code matches the dimensions.
Confirm availability and current pricing at RFQ time.