47 µF at 35 V — where this cap fits the BOM
The TAJD476M035RNJV: At 47 µF and 35 V rated, this TAJ-series molded tantalum sits in the bulk decoupling sweet spot for 3.3 V and 5 V rails that need headroom against transients — the 35 V rating gives a 7× margin over a 5 V rail, which keeps derating well within the 50 % guideline many avionics and industrial power trees follow. The 900 mOhm ESR at 100 kHz sets the ripple current ceiling: at 35 V, the maximum ripple current is roughly 620 mA RMS before self-heating cuts into the 2000-hour lifetime at 125°C. For a switching regulator output, that ESR also defines the output ripple voltage — a 100 mV ripple target needs the cap to see less than 160 mA RMS ripple current.
Temperature grade and endurance profile
The 2000-hour endurance at 125°C is the standard JIS C 5141 / EIA-535 rating for tantalum MnO2 capacitors. At 85°C the lifetime derates to roughly 20000 hours; at 50°C it exceeds 100000 hours — the failure mode is wear-out of the dielectric, not a wear-out of the termination.
2917 (7343 Metric) case, size code D — 7.30 mm x 4.30 mm footprint, 3.10 mm seated height. The molded body has no exposed metal on the sides, so the anode and cathode terminations are at the ends only. The pad layout follows the standard 7343-31 footprint: a 1.27 mm gap between the anode and cathode pads, with the cathode pad extending 2.54 mm from the body edge. The moisture sensitivity level (MSL) for molded tantalums is MSL 3, so a bake is needed if the reel has been exposed to ambient humidity beyond the floor-life limit.