The TAJA106K006RNJ: This is a KYOCERA AVX TAJ series molded tantalum capacitor, 10 µF ±10% with a 6.3 V DC rating. The 4 Ohm ESR is typical for a size-A case tantalum at this capacitance and voltage — it limits ripple current capability compared to a polymer or MLCC alternative, so confirm the AC ripple across the capacitor does not exceed the self-heating limit at the application frequency.
TAJA106K006RNJ carries an Active lifecycle status — KYOCERA AVX continues to manufacture it, and new designs can use it without a last-time-buy window.