What the AEC-Q200 rating means for your BOM
This TAJB475M035TNJ carries an AEC-Q200 qualification — the stress-test and reliability baseline for passive components in automotive electronics. That means it has passed temperature cycling, moisture resistance, and mechanical shock sequences that standard tantalums skip. For an under-hood ECU or a chassis-domain sensor module, this rating is the gate the component engineer checks first.
Capacitance, voltage, and tolerance — the BOM check
4.7 µF at 35 V with ±20% tolerance — the capacitance is nominal at 25°C and 0 VDC bias. Tantalum capacitors lose capacitance under DC bias less than MLCCs do, but the ±20% tolerance band means the minimum capacitance at the operating voltage could be 3.76 µF. If your circuit needs a guaranteed minimum of 4 µF at 35 V, this part is marginal; a higher voltage rating or tighter tolerance code would be safer. The 1411 (3528 Metric) case, size code B, measures 3.50 mm x 2.80 mm with a seated height of 2.10 mm max. That footprint matches the standard 3528-21 tantalum land pattern — no board respin needed if you are replacing a different manufacturer's B case.
ESR and ripple current — what 3.1 Ohm at 100 kHz drives
The ESR is 3.1 Ohm at 100 kHz — that is the resistive loss inside the capacitor. For a typical DC-DC converter output filter, the ripple current heats the part; at 100 kHz the self-heating from 100 mA ripple is about 31 mW, which is negligible in free air. But if the ripple current is 500 mA, the internal temperature rise approaches 10°C above ambient, which eats into the 125°C lifetime margin. The datasheet's ripple-current derating curve (page 7) is the right reference for your actual load.
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