2.2 µF, 20 V, 3 Ω ESR — what it buys the design
The TPSA225K020R3000 is a 2.2 µF molded tantalum capacitor rated at 20 V with a 3 Ω ESR, housed in a standard 1206 (3216 Metric) package. At 20 V rated, this cap has headroom for a 12 V or 5 V rail, but the derating rule of thumb (50% on voltage for solid tantalums) means it should not see more than 10 V DC in continuous service to stay within the safe operating area — a common practice for reliability in avionics or industrial power stages.
Package and footprint — 1206 case, tape-and-reel ready
The 1206 (3216 Metric) case measures 3.20 mm x 1.60 mm with a seated height of 1.80 mm max. The manufacturer size code is A. The footprint is a standard 1206 solder-land pattern; no via-in-pad or thermal-relief trick is needed for this ESR level.