Capacitance, voltage, and ESR — the three numbers that decide fit
The TAJA154J035RNJ: 0.15 µF at 35 V is the capacitance-voltage pair that tells you this cap sits on a 24 V or 12 V rail with margin — the 35 V rating covers transients on a nominal 24 V bus without derating below 80 %. 21 Ohm ESR is the dissipation factor that limits ripple current. For a 0.15 µF part, the ESR is high enough that AC ripple above a few tens of milliamps will self-heat the capacitor — budget derating if the circuit carries switching ripple. ±5 % tolerance keeps the capacitance stable for timing circuits that need a predictable RC constant.
The molded 1206 package (3.20 mm x 1.60 mm footprint, 1.80 mm seated height) is a standard surface-mount size that reflows on a standard lead-free profile and is inspectable under a microscope.
This part is a standard catalog item from KYOCERA AVX.