I’ll research the PC817X1CSP9F manufacturer specifications, practical wiring, and replacement options, then write the cited application guide in the project files.
Created the PC817X1CSP9F Application and Usage Guide in the project files, covering all seven requested sections, resistor calculations, alternative-part links, and source URLs.
Verification remains incomplete: datasheet citation processing did not finish, so source-transcribed specifications are flagged; package dimensions, MOQ, reel quantity, and revision/date remain unresolved. These need confirmation before publishing the guide as fully verified.