0.33 µF, 50 V — derating margin in a B case
The TAJB334K050RNJ is a molded tantalum capacitor from the TAJ series, rated 0.33 µF at 50 V with ±10% tolerance. The 50 V rating gives a 2:1 derating margin on a 25 V rail, which is standard practice for tantalum capacitors to avoid surge failures. The B case size (3.50 mm x 2.80 mm, seated height 2.10 mm) fits a 1411 (3528 Metric) or 1210 footprint — a common land pattern that shares pad geometry with many competitor B-case parts.
For a decoupling application on a 50 V rail, the ESR is secondary to the DC leakage stability.