The maximum power dissipation of the LM324APWRG4 is 670mW, which is calculated based on the package thermal resistance and the maximum junction temperature.
While the LM324APWRG4 is an op-amp, it can be used as a comparator in a pinch. However, it's not the best choice due to its limited bandwidth and slew rate. A dedicated comparator like the LM339 would be a better choice.
To ensure stability, make sure to follow proper PCB layout practices, use a low-ESR capacitor for decoupling, and consider adding a compensation capacitor in the feedback loop if necessary. Also, ensure that the gain and phase margins are sufficient to prevent oscillations.
The input impedance of the LM324APWRG4 is typically around 2MΩ, but it can vary depending on the specific application and operating conditions.
The LM324APWRG4 is rated for operation up to 125°C, but its performance may degrade at higher temperatures. If you need to operate in a high-temperature environment, consider using a more temperature-stable op-amp like the OPAx197.