4.7 µF at 20 V — the decoupling and filtering anchor
The TAJC475K020PNJ is a KYOCERA AVX TAJ series molded tantalum capacitor delivering 4.7 µF capacitance with ±10% tolerance at a 20 V DC rated voltage. The 1.4 Ohm ESR at 100 kHz sets the ripple current handling and self-heating floor — for a 20 V bus decoupling a 100 mA load step, the ripple voltage across the ESR stays under 140 mV, which is tight enough for most 3.3 V and 5 V regulator input rails.
The 125°C upper limit means it can sit next to a hot processor or power inductor without derating the voltage — tantalum capacitors lose capacitance at cold temperatures, but the 4.7 µF nominal at 25°C is still above 4 µF at -55°C, which keeps the RC time constant within tolerance for timing circuits.
2312 (6032 Metric) — the PCB footprint
The 2312 (6032 Metric) case measures 6.00 mm x 3.20 mm with a seated height of 2.80 mm. This is the standard C-size tantalum footprint — it matches the industry-wide 6032-28 land pattern. The molded body has no polarity marking ambiguity; the anode is the chamfered end, and the cathode is the top bar. Reflow profile follows the standard J-STD-020 for MSL 3 parts.
Listed as Active with no last-time-buy or NRND flag.