The TAJB686K006H: The 68 µF capacitance at 6.3 V rated voltage is a standard bulk-decoupling value for 3.3 V and 5 V rails in mixed-signal designs, but the 900 mOhm ESR sets a ripple-current ceiling — at 100 kHz the capacitor dissipates I² × 0.9 W, so the RMS ripple current should stay under 500 mA to keep self-heating within the 125°C limit. At 125°C the leakage current rises per the datasheet curve; derate the applied voltage to 50% of rated for continuous operation above 85°C.
The molded 1411 (3528 Metric) case with B case code is a common footprint shared across the TAJ series.
Molded tantalum — construction and fit
Molded construction with a solid manganese dioxide cathode — the same construction as the standard TAJ series. The ±10% tolerance covers the full temperature range; no voltage derating is required at room temperature, but for 125°C operation a 50% derating is recommended per industry practice. Surface-mount 1411 (3528 Metric) package, 3.50 mm × 2.80 mm footprint, 2.10 mm seated height. The B case code matches the standard EIA 3528-21 outline.