The maximum power dissipation of the MC1458N is 670mW, which is calculated based on the maximum junction temperature (Tj) of 150°C and the thermal resistance (Rthja) of 125°C/W.
While the MC1458N 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 slew rate and bandwidth. A dedicated comparator like the LM339 or LM393 would be a better choice.
To ensure stability, make sure to decouple the power supply lines with capacitors (e.g., 10uF and 100nF) and use a bypass capacitor (e.g., 10nF) between the output and the inverting input. Also, avoid using long wires or traces that can introduce noise and oscillations.
The input impedance of the MC1458N is typically around 2MΩ, which is relatively high. This makes it suitable for use in high-impedance circuits, such as audio amplifiers and sensors.
Yes, the MC1458N can be used in a single-supply configuration. However, you'll need to ensure that the input signals are referenced to the midpoint of the supply voltage (Vcc/2) using a voltage divider or a virtual ground circuit.
MC1458N datasheet
by STMicroelectronics
