The maximum power dissipation of the TL084CD 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 TL084CD 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 bandwidth. A dedicated comparator like the LM339 would be a better choice.
To ensure stability in a unity-gain buffer configuration, make sure to add a capacitor (typically 10-100nF) between the output and the inverting input to prevent oscillations. Additionally, use a low-ESR capacitor for power supply decoupling.
The maximum input voltage range of the TL084CD is from -13.5V to +13.5V, which is the maximum differential input voltage. Exceeding this range can cause the op-amp to saturate or even be damaged.
The TL084CD is rated for operation up to 125°C, but its performance may degrade at higher temperatures. If you need to operate in high-temperature environments, consider using a more temperature-resistant op-amp like the OPA340.