What this TAJ tantalum does on the board
The TAJE686M025RNJ: This is a molded tantalum capacitor from the TAJ series, 68 µF at 25 V with ±20% tolerance — a common bulk-decoupling choice for 12 V or 5 V rails where the 25 V rating provides derating margin against ripple and transients. The 900 mOhm ESR at 100 kHz sets the self-heating floor under ripple current; for a 12 V-to-5 V buck converter output, the capacitor's ripple current capability is limited by this ESR and the 125 °C upper limit.
Case size and footprint fit
E case code (2917 / 7343 metric) — 7.30 mm x 4.30 mm footprint, 4.30 mm seated height. The land pattern matches the standard 2917 pad geometry used across the TAJ family, so a layout designed for a 100 µF / 10 V TAJE part accepts this 68 µF / 25 V variant without a board spin.