The TAJA335K020RNJ: This is a 3.3 µF molded tantalum in the TAJ series, rated at 20 V with a 4.5 Ohm ESR — the three numbers that decide whether it clears a 12 V rail with margin or drops too much ripple for a sensitive load. The 20 V rating gives 67% derating on a 12 V rail — standard practice for tantalum caps to avoid the surge-failure mode that shows up as a scorched case on the board. ESR at 4.5 Ohm is typical for a small-case tantalum at this capacitance; if the original cap had a lower ESR (say 1 Ohm), this one will run warmer and the ripple voltage across it will be higher — check the ripple current spec in the circuit before swapping.
That means it's a standard BOM line, not an obsolete scavenger hunt.
Military temp range — where it survives
This cap is at home in avionics black boxes, downhole instrumentation, or satellite payloads where the ambient swings from cold soak to regulator hotspot. The 1206 (3216 Metric) case is a standard footprint; height seated is 1.80 mm max, which fits most board-stacking clearances on mezzanine or backplane assemblies.