4.7 µF, 16 V, B-size molded tantalum — decoupling and bulk storage fit
The TAJB475K016HNJ is a molded tantalum capacitor from the TAJ series, rated 4.7 µF at 16 V with ±10% tolerance. The B-size code (3.50 mm × 2.80 mm footprint, 2.10 mm seated height) fits standard 1411 (3528 Metric) pads, making it a direct drop-in for many general-purpose decoupling and bulk-storage positions on 12 V or 5 V rails.
2000-hour endurance at 125°C — thermal ceiling for high-temp environments
This covers industrial and automotive under-hood ambient where board temperatures regularly exceed 85°C. Derating the applied voltage to 10 V or below extends the useful life beyond the 2000-hour mark — standard practice for tantalum capacitors in high-reliability designs.
3.5-ohm ESR at 100 kHz — not a low-ESR part for high-ripple SMPS outputs
With 3.5-ohm equivalent series resistance at 100 kHz, this capacitor is suited for general-purpose filtering, timing circuits, and bulk storage where ripple current is modest. For high-frequency decoupling on a switching regulator output (where ESR below 1 ohm is typical), a polymer or low-ESR tantalum would be a better fit.