What this molded tantalum cap is for
The TPSB335M020H1300 is a molded tantalum capacitor from the KYOCERA AVX TPS series, rated 3.3 µF at 20 V with ±20% tolerance and a 1.3 Ohm ESR. It comes in a 1411 (3528 Metric) surface-mount package, size code B.
At 1.3 Ohm ESR, this capacitor handles moderate ripple current — enough for a 12 V rail smoothing or a 5 V-to-3.3 V LDO output filter, but not a high-frequency bulk decoupling point where sub-100 mOhm parts are needed. The ESR also sets the self-heating: at 100 kHz ripple, the internal temperature rise stays within the 125°C ceiling for typical load currents.
