The maximum power dissipation of the LM321MF/NOPB is 670mW, which is calculated based on the maximum junction temperature (TJ) of 150°C and the thermal resistance (θJA) of 125°C/W.
The LM321MF/NOPB is rated for operation from -40°C to 125°C, but it's not recommended to use it in high-temperature environments above 85°C without proper heat sinking and thermal management.
To ensure stability, make sure to follow the recommended compensation capacitor values and placement, and consider adding a zero-pin or a lead capacitor to reduce oscillations. Also, ensure that the feedback loop has a sufficient phase margin and gain margin.
The input impedance of the LM321MF/NOPB is typically around 2MΩ, but it can vary depending on the specific application and operating conditions.
While the LM321MF/NOPB can be used as a comparator, it's not the most suitable choice due to its relatively slow slew rate and limited output current. A dedicated comparator IC would be a better choice for most applications.