68 µF, 6.3 V, 500 mOhm ESR — molded tantalum for power rail filtering
The TPSB686M006H0500 is a molded tantalum capacitor from KYOCERA AVX's TPS series, rated at 68 µF with a 6.3 V DC voltage rating and a maximum ESR of 500 mOhm. The ESR is the dominant factor for ripple current capability — at a given ripple current, the self-heating is I² × ESR, so a 500 mOhm ESR limits the allowable ripple to roughly 0.5 A RMS before the internal temperature rise exceeds the 125°C ceiling. The ±20% tolerance is typical for tantalum electrolytics; the actual capacitance at the rated 6.3 V will be near the nominal value, but derating to 50% of rated voltage (3.15 V) is standard practice to reduce the risk of field failure from voltage surges.
The molded case construction provides mechanical stability across this range without the potting compound cracking seen in some conformally-coated parts.