The TAJD227K004RNJ: This is a 220 µF molded tantalum capacitor rated at 4 V, ±10% tolerance — a common bulk-decoupling value for 3.3 V or 1.8 V supply rails where the voltage derating rule (typically 50% of rated voltage) leaves comfortable margin at 2 V working. The 900 mOhm ESR sets the ripple-current limit: at 100 kHz, the maximum allowable AC ripple current is roughly 470 mA RMS before self-heating exceeds the 125°C ceiling. For a switching regulator output, this cap handles moderate ripple but not high-frequency, high-ripple bulk banks.
D-case 2917 footprint — layout fit
Package is 2917 (7343 Metric), manufacturer size code D — 7.30 mm x 4.30 mm footprint, 3.10 mm maximum seated height. Surface-mount, supplied on Tape & Reel. The D-case is the standard large-tantalum footprint; the pad layout matches the common 7343-31 pattern used across the TAJ series.
Temperature range — military-grade operating envelope
Rated -55°C to 125°C, which covers the full military/aerospace temperature band. This cap can serve avionics, satellite, downhole instrumentation, or any environment where the ambient swings below -40°C. The 125°C upper limit is the maximum case temperature; derating the applied voltage above 85°C is standard practice per MIL-PRF-55365 guidelines.