4.7 µF, 50 V, 1.4 Ohm ESR — bulk decoupling for 12 V and 48 V rails
The TAJC475M050RNJ is a molded tantalum capacitor from the TAJ series, rated 4.7 µF at 50 V with an ESR of 1.4 Ohm. The 1.4 Ohm ESR sets the self-heating under ripple: at 100 kHz with 500 mA ripple, the internal temperature rise is roughly 0.35 °C above ambient — negligible in most enclosures, but the stack-up matters if the capacitor sits near a hot MOSFET or inductor.
No pin-compatible replacement is needed — the original order code is the straightforward path.
Military temperature range — avionics and outdoor telecom
In an avionics power supply that sees -40 °C cold-soak and +85 °C continuous, the part has 40 °C of margin on each end.