The TAJA225M006SNJ is a molded tantalum capacitor from the KYOCERA AVX TAJ series, rated 2.2 µF at 6.3 V with ±20% tolerance. ESR is specified at 9 Ohm at 100 kHz. It also affects the impedance at the switching frequency of a buck converter; at 100 kHz the impedance is dominated by ESR, so the cap will have a flat response above that point. The full -55°C low end means this cap holds its capacitance down to cold-start conditions in outdoor telecom or engine-bay electronics.
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Lifecycle status is listed as Active. We source TAJA225M006SNJ against your BOM quantity.
Design-in note — 1206 footprint and temperature derating
The 1206 case (3.20 mm x 1.60 mm, seated height 1.80 mm) is a standard footprint that matches most 1206 ceramic capacitor pads, though the molded tantalum body is taller. Confirm the clearance under adjacent components. At 125°C the rated voltage should be derated per the manufacturer's application guidelines; typical practice for tantalum capacitors is to operate at no more than 50-60% of rated voltage to reduce failure rate. The 6.3 V rating here means a 3.3 V rail is well within that margin.