4.7 µF, 10 V — automotive-grade tantalum in a 1206 footprint
The TAJA475K010TNJ is a molded tantalum capacitor from the KYOCERA AVX TAJ series, rated at 4.7 µF with ±10% tolerance and a 10 V working voltage. It carries AEC-Q200 qualification, meaning it has passed the full automotive reliability stress sequence — temperature cycling, moisture resistance, and mechanical shock — and is PPAP-ready for production programs targeting under-hood or chassis-domain ECUs.
AEC-Q200 — what the qualification certifies
AEC-Q200 is the passive-component stress-test standard for automotive-grade parts. For this capacitor, it means the part has been tested to 1000 temperature cycles (-55°C to 125°C), biased humidity at 85°C/85% RH, and board-level solder-shock.
ESR and ripple-current ceiling in a 1206 case
ESR is specified at 5 Ohm measured at 100 kHz. In a switching-regulator output filter, this ESR sets the self-heating limit: the ripple current through the capacitor generates I²R loss that raises the internal temperature above ambient. The 1206 case (3.20 mm x 1.60 mm x 1.80 mm seated height) has limited surface area for convective cooling, so the ripple-current rating is lower than a same-value part in a larger case size. Derate for temperature above 85°C per the standard tantalum derating curve.