The maximum power dissipation of the LM324KADR is 670mW, which is calculated based on the package thermal resistance and the maximum junction temperature.
While the LM324KADR is an op-amp, it can be used as a comparator in a pinch. However, it's not the best choice due to its relatively slow slew rate and limited output current. A dedicated comparator like the LM339 would be a better choice.
To ensure stability, make sure to follow proper compensation techniques, such as adding a capacitor in the feedback loop to reduce the gain at high frequencies. Additionally, ensure that the op-amp is not oscillating by checking the output waveform for ringing or oscillations.
The input impedance of the LM324KADR is typically around 2MΩ, but this can vary depending on the specific application and operating conditions.
The LM324KADR is rated for operation up to 125°C, but the maximum junction temperature should not exceed 150°C. Be sure to derate the device's power dissipation and ensure proper heat sinking to prevent overheating.