Optocoupler datasheet for the SFH617A, a 429 KB PDF. This part is a phototransistor-output optocoupler commonly used in the feedback loop of switching power supplies to isolate the secondary side from the primary controller. The document lists the pinout, current transfer ratio groups, isolation voltage and LED forward ratings. When a supply cycles or over-regulates, test the LED and transistor sides separately and choose a replacement with a matching CTR grade suffix.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @datasheet_technar_org. Enginerys does not host this file.
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