The advantage of an op amp used as a comparator over a linear IC comparator is that the op amp comparator functions as a switch and provides a linear relationship between the input and output.

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An op amp used as a comparator does function as a switch, providing a high or low output depending on the input voltages, but it does not provide a linear relationship between input and output; it operates in a non-linear mode when used as a comparator.

The Advantage of an Op Amp Used as a Comparator