The "unused op amps" we are talking about here do not refer to op amps in chip storage bins or anti-static bags; rather, they are unused parts of multiple op amps in the same package.
It is best to connect an unused op amp to an amplifying circuit with a feedback loop. Obviously, the unity gain buffer circuit is a good choice because it does not require additional components. Then, connect the input pins to the voltage within the linear input and output range. Any connection or open circuit that causes potential input and output overload, and placing the op amp in an environment where noise is uncertain is not appropriate.
A board design recommendation is to place unused op amps where they are suitable for modification. You may use it when redesigning or upgrading your product. Make some considerations in advance and connect these spare operations to the top and bottom layers so that minor changes can test new designs. You can even lay out the feedback component layout and connect the trace to a specific node so that it can be easily cut off.
Another way to completely avoid the above problem is to choose an appropriate version of the op amp (single op amp, dual op amp and quad op amp), the OPA322 is an example. This allows you to design an ideal layout for the full use of the op amp, while also ensuring that the op amps used have the same specifications and characteristics.
For designers who don't have the right approach to handling unused op amps, it's comforting that these unused op amps don't interfere with the op amps that are working in the same package. Although you may be concerned about the extra current that is not being used by the op amp, your system is unlikely to burn out. Most modern op amps have independent bias currents, and one channel overload in the same package will not affect other channels. If your circuit is working properly, then you can easily take it and follow these suggestions the next time you design it.
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