The TAJS335K006RNJ: The 125°C ceiling is the absolute max ambient; derate voltage above 85°C per the standard tantalum derating curve.
At 9 Ohm ESR, this 3.3 µF cap has a self-heating limit — ripple current at 100 kHz will be around 250 mA RMS before the internal temperature rise becomes a concern. For a low-power decoupling or timing circuit that sees under 100 mA ripple, it is fine. For a high-ripple buck output, you want a lower-ESR polymer or a larger-case tantalum.
The TAJ series is a long-running KYOCERA AVX staple; second-sourcing is straightforward from other major tantalum suppliers with the same 1206 S-case footprint.