An optoisolator combines an LED and a photodiode is a single package.

Name: An optoisolator combines an LED and a photodiode is a single package.
Brand: Quizplus
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An optoisolator (also known as an optocoupler) is a device that combines an LED and a photodiode (or phototransistor) in a single package, allowing electrical signals to be transferred between two circuits while keeping them electrically isolated.

An Optoisolator Combines an LED and a Photodiode Is a Single