47 µF at 20 V — bulk capacitance for rail decoupling
The 900 mOhm ESR sets the ripple-current handling and self-heating limit — in a 12 V input to 3.3 V output buck converter, this capacitor on the output filters the switching ripple while staying within its thermal budget.
The capacitance and ESR shift across the range — at -55°C the ESR rises and the capacitance drops, so the ripple current derating must account for the cold corner. At +125°C the leakage current increases, reducing the safe operating voltage below the 20 V rating.
The part can be quoted to order for volume BOM quantities through independent distribution — no last-time-buy window to schedule.
2917 (7343 Metric) — footprint and layout
The D case size measures 7.30 mm x 4.30 mm with a seated height of 3.10 mm max. The 2917 (7343 Metric) footprint is standard for tantalum capacitors in this density range — the pad layout on the PCB should follow the manufacturer's recommended land pattern to avoid tombstoning during reflow.