10 µF, 10 V — the core selection specs
The TAJA106K010RNJV: 10 µF capacitance at 10 V rated voltage, ±10% tolerance — the working voltage is the same as the rating, so a 10 V rail should see at least 20 % derating for reliability in line-powered designs. Molded 1206 (3216 Metric) case, size code A — the 0.126" × 0.063" footprint matches the standard 1206 land pattern; the seated height is 0.071" max.
Temperature range and lifetime anchor
For a 24/7 engine-bay ECU running at 105°C, that translates to roughly 83 days of continuous operation at the temperature limit before derating is needed.
ESR and ripple current — what 3 Ohm means
3 Ohm ESR at 100 kHz — this is the AC resistance that generates heat under ripple current. In a 100 kHz buck converter output, a 10 µF cap with 3 Ohm ESR will have a ripple current rating around 200 mA RMS before self-heating becomes a concern.