The TPSA225M010R1800: This is a molded tantalum capacitor from the TPS series, rated 2.2 µF at 10 V with ±20% tolerance. The 1.8 Ohm ESR is the dominant parameter for ripple current handling — at the rated voltage, the capacitor's self-heating stays within limits when the ripple current is kept below the calculated I²R dissipation. For a 3.3 V rail decoupling a 500 mA load, the 2.2 µF value provides enough bulk charge to hold the rail during a 1 µs load transient without the output dropping below the regulator's dropout threshold. The 1206 case size (3.20 mm x 1.60 mm footprint, 1.80 mm seated height) is a standard land pattern — no special pad geometry required beyond the manufacturer's recommended solder pad dimensions for reflow assembly. The molded construction gives consistent dimensional control for pick-and-place.
Sourced through independent distribution, quantities are confirmed at RFQ against your target volume. For an engine-bay ECU that sees 105°C on a summer grade, the 125°C ceiling provides 20°C of margin before derating is required.
Footprint and polarity — what the board layout needs
The 1206 case (EIA size code A) uses a standard two-terminal molded tantalum footprint. Polarity is marked on the top face — the anode (+) is indicated by a stripe or bevel on the molded body. Reverse voltage will damage the dielectric; verify orientation during pick-and-place programming. Cut-tape quantities are available for prototyping or low-volume builds.