Automotive-grade tantalum for 50 V rails
The TAJD475M050TNJV is a molded tantalum capacitor from the TAJ series, rated at 4.7 µF with ±20% tolerance and a 50 V DC working voltage. The D-case 2917 footprint (7.30 mm x 4.30 mm, 3.10 mm seated height) is a standard size for 50 V tantalum bulk decoupling — the board layout matches other D-case parts from the same family without pad changes.
ESR and lifetime at temperature
ESR is specified at 1.4 Ohm at 100 kHz — this is the value that governs ripple current handling and output ripple in a switching regulator. For a 4.7 µF cap on a 500 kHz buck output, the ripple voltage from ESR alone is roughly I_ripple × 1.4 Ohm; budget accordingly in the decoupling loop. Endurance is rated at 2000 hours at 125°C, which is the standard tantalum life test. In a 105°C ambient the expected life extends significantly — derate per the AVX application note for the actual duty cycle.