150 µF, 10 V, 1.2 Ohm ESR — bulk decoupling fit
The TAJY157K010RNJ: This is a 150 µF molded tantalum capacitor rated at 10 V with a 1.2 Ohm ESR, surface-mount in the 2917 (7343 Metric) package — the Y case code. The 1.2 Ohm ESR means it handles ripple current without excessive self-heating; expect around 1.2 A ripple current at 100 kHz before the internal temperature rise cuts into the 125°C ceiling. The ±10% tolerance is the standard production band — for a 150 µF part, the actual capacitance at 25°C and 0 V bias lands between 135 µF and 165 µF. Derate the capacitance by 20% at full rated voltage per tantalum application practice.
KYOCERA AVX continues to manufacture this order code. No official successor or replacement has been issued; the TAJ series remains a current catalog line.
The 125°C rating is the maximum case temperature; derate the voltage above 85°C per the standard tantalum derating curve (typically 50% derating at 125°C).