6.8 µF at 50 V — the bulk cap for 48 V bus filtering
The TAJD685K050RNJV: This is a 6.8 µF, 50 V molded tantalum from the TAJ series — a standard value for bulk decoupling on 48 V telecom rails or input filtering on DC-DC converters where the steady-state bus sits at 48 V and the 50 V rating gives a few volts of headroom for transients. The 1 Ω ESR at 100 kHz tells you the ripple current capability is moderate — fine for a linear regulator output or a low-ripple switching supply, but if your converter pushes ripple current, the self-heating from that ESR will eat into the 2000-hour life at 125 °C.
Package and temperature — field-fit for industrial and telecom boards
2917 (7343 Metric) case, size code D — 7.30 mm x 4.30 mm footprint, 3.10 mm seated height. Surface-mount, tape-and-reel delivery. The molded case is polarity-marked with a stripe on the positive side; orientation is obvious enough to hand-place on a rework station without a magnifier. Rated -55 °C to 125 °C, with 2000 hours endurance at the top temperature. That covers outdoor telecom cabinets, industrial motor drives, and engine-bay electronics — but if your board runs continuous 125 °C, plan for a replacement interval or derate the applied voltage per the manufacturer's guidelines.
No end-of-life notice, no last-time-buy deadline.