The maximum power dissipation of the LM324ADR is 670mW, which is calculated based on the package thermal resistance and the maximum junction temperature.
While the LM324ADR can be used as a comparator, it's not the best choice due to its relatively slow slew rate and limited bandwidth. A dedicated comparator like the LM339 or LM2901 would be a better option.
To ensure stability, make sure to follow proper compensation techniques, such as adding a capacitor in the feedback loop or using a resistor in series with the capacitor to prevent oscillations.
The input impedance of the LM324ADR is typically around 2MΩ, but it can vary depending on the specific application and operating conditions.
The LM324ADR is rated for operation up to 125°C, but its performance may degrade at higher temperatures. Be sure to check the datasheet for specific temperature-related specifications.