2.2 µF at 16 V — sizing the bypass cap
The TAJA225K016A: This is a 2.2 µF molded tantalum capacitor rated for 16 V DC, in a standard 1206 (3216 metric) surface-mount case. The ±10% tolerance keeps the value tight enough for most decoupling and filtering roles on a 12 V or 5 V rail — the 16 V rating gives about 30 % derating on a 12 V bus, which is the common practice for tantalum reliability.
6.5 Ohm ESR — what it limits
The 6.5 Ohm ESR (equivalent series resistance) is on the higher side for a 2.2 µF tantalum. It means the cap can only handle modest AC ripple current before self-heating becomes an issue — fine for DC bulk decoupling or slow RC timing, but not for high-frequency switching regulator output stages where you would want a lower-ESR polymer or MLCC.
Temperature range and case code
The manufacturer size code is A, seated height max 1.80 mm — the low profile fits tight board stacks.