6.8 µF at 35 V — bulk decoupling in a 2917 footprint
The TAJY685K035RNJ: This is a molded tantalum capacitor from the TAJ series, rated 6.8 µF with ±10% tolerance at 35 VDC. The 900 mOhm ESR is typical for a 35 V tantalum in this case size. That ESR limits ripple current handling to roughly 200–300 mA RMS before self-heating becomes a concern; for a low-ripple DC rail it is fine, but if the rail carries switching ripple above 500 mA, a polymer or ceramic alternative would run cooler.
Active production — no end-of-life scramble
At 125°C the voltage derating curve applies — KYOCERA AVX recommends derating to 2/3 of rated voltage above 85°C, so at 125°C the applied voltage should stay below ~23 VDC to keep the failure rate within the FMEA budget.
T491X685K035AT cross-shop — same footprint, different ESR
The T491X685K035AT (KEMET) is a common alternative in the same 2917 case, same 6.8 µF / 35 V rating. The TAJY685K035RNJ carries a 900 mOhm ESR, while the T491X series typically specifies a lower ESR (around 500 mOhm for the X case). If your design is ripple-current-limited, the T491X may run cooler; if the ESR is not the limiting factor, the TAJY is a drop-in swap on the same land pattern.