10 µF, 25 V, 1.2 Ω ESR — the three numbers that size this cap
The TAJD106M025RNJ is a molded tantalum capacitor from KYOCERA AVX's TAJ series, rated 10 µF at 25 V with an ESR of 1.2 Ω. These three numbers drive the fit: the capacitance and voltage set the rail-bulk decoupling or filtering role, while the ESR tells you the self-heating under ripple current — a 1.2 Ω ESR means the cap dissipates I²·1.2 W, so the ripple current rating is lower than a low-ESR polymer would deliver. Tolerance is ±20%, which is standard for a general-purpose tantalum — the BOM should not rely on a tighter capacitance tolerance from this part.
This makes the TAJD106M025RNJ a candidate for avionics, satellite, downhole instrumentation, or outdoor telecom cabinets where the ambient sees both deep cold and sustained heat. The 25 V rating holds across the entire range — no voltage derating is required at temperature extremes, though tantalum capacitors are traditionally derated by 50% on voltage for reliability in high-stress applications.
2917 (7343 Metric) D case — the footprint that sets the pad layout
The D case size (7.30 mm x 4.30 mm x 3.10 mm seated height) is the 2917 footprint in imperial nomenclature, 7343 Metric. A board already laid out for a D-size tantalum accepts this part without a pad respin. The molded body gives consistent dimensions for pick-and-place and reflow.