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The Vishay Semiconductor SFH620A-2 is a single-channel optoisolator that electrically isolates control signals from high-voltage or noisy circuits. It transfers signals via light rather than a direct electrical connection, helping protect sensitive components from voltage spikes and interference. With an isolation rating of 5300 Vrms, it is generally used where safety and signal separation are required.
Inside the package, an infrared LED drives a phototransistor. When the LED turns on, the transistor switches on accordingly on the output side, allowing signal transfer while keeping both sides electrically isolated.
The SFH620A-2 comes in a standard 4-pin DIP package, making it easy to install on through-hole PCBs. It supports transistor-switched output, which works well with standard digital and control circuits.
It helps prevent high-voltage sections from affecting low-voltage control electronics.
For more information please check the datasheets.
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