Category: Optocouplers 

An optocoupler, also known as an optoisolator, is a device that transfers electrical signals between two isolated circuits using light, providing a safe and reliable way to prevent high voltages or electrical noise from passing between them. It typically contains an LED on the input side and a light-sensitive component—such as a phototransistor, photodiode, or phototriac—on the output side, all sealed within a single package. When the LED turns on, it emits light that activates the output device, allowing the signal to cross the isolation barrier without any direct electrical connection. This makes optocouplers essential in protecting microcontrollers, communication interfaces, and low-voltage electronics from surges, spikes, and ground-loop issues in power supplies, industrial controls, and switching circuits.

 

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Internal identifier: optocoupler - Created: 2026-02-12 16:36:16