0.68 µF, 50 V, 7 Ohm ESR — bulk decoupling for a 50 V rail
The TAJC684M050SNJ: This is a molded tantalum capacitor from the TAJ series, rated 0.68 µF at 50 V with ±20% tolerance and a 7 Ohm ESR. The 50 V rating gives headroom on a 48 V telecom bus or a 28 V avionics rail; the ESR tells you how much ripple current the part can handle before self-heating becomes a derating issue.
The molded case and surface-mount 2312 (6032 Metric) footprint keep it stable across that swing.
