{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD817C3S","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD817C3S","canonicalUrl":"https://icboms.com/onsemi/FOD817C3S","factsUrl":"https://icboms.com/api/mcp/products/FOD817C3S","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD817C3S single-channel DC-input transistor-output optocoupler, 5000Vrms isolation, 200-400% CTR at 5mA, 70V output max, 4-SMD Gull Wing package, Tube.","salesMarkdown":"## 5000Vrms isolation in a 4-SMD Gull Wing package The onsemi FOD817C3S is a single-channel optocoupler with a phototransistor output, rated for 5000Vrms isolation between input and output. That 5 kV isolation rating is the key spec for safety-barrier applications in AC mains-powered equipment — think switch-mode power supply feedback loops, PLC digital inputs, or motor-drive interface circuits where you need to break ground loops and pass a logic-level signal across a reinforced insulation barrier. The current transfer ratio (CTR) is specified as a minimum of 200% and a maximum of 400%, both measured at a forward current of 5 mA. This means with 5 mA through the IR LED, the output transistor can sink at least 10 mA — enough to drive a TTL/CMOS gate input directly without an extra buffer stage. The 200% floor also gives you headroom for LED degradation over temperature and lifetime. ## Temperature range and switching speed for industrial use Operating temperature spans -55°C to 110°C, which covers the full industrial range and reaches into the under-hood automotive zone. The output transistor is rated for 70 V maximum collector-emitter voltage and 50 mA continuous current.","metaTitle":"onsemi FOD817C3S Optoisolator, 5000Vrms, 200-400% CTR, 4-SMD","metaDescription":"onsemi FOD817C3S single-channel transistor output optocoupler, 5000Vrms isolation, 200-400% CTR at 5mA, -55°C to 110°C, 4-SMD Gull Wing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Mfr":"onsemi","Series":"-","Package":"Tube","Input Type":"DC","Output Type":"Transistor","Mounting Type":"Surface Mount","Package / Case":"4-SMD, Gull Wing","Product Status":"Active","lifecycle_stage":"eol_hot","Number of Channels":"1","Base Product Number":"FOD817","Voltage - Isolation":"5000Vrms","Vce Saturation (Max)":"200mV","Operating Temperature":"-55°C~110°C","Rise / Fall Time (Typ)":"4µs, 3µs","Voltage - Output (Max)":"70V","Supplier Device Package":"4-SMD","Current - Output / Channel":"50mA","Current Transfer Ratio (Max)":"400% @ 5mA","Current Transfer Ratio (Min)":"200% @ 5mA","Voltage - Forward (Vf) (Typ)":"1.2V","Turn On / Turn Off Time (Typ)":"-","Current - DC Forward (If) (Max)":"50 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.1331","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/97f795ec3476128abe24ed3f2e223d6c.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/FOD817C3S/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to FOD817C3S in this Optoisolators family?","answer":"The FOD817 series includes multiple CTR bin options (e.g., FOD817A, FOD817B, FOD817C) in the same 4-SMD Gull Wing package. The FOD817C3S is the 200–400% CTR bin; a lower-CTR bin like FOD817A (80–160%) may require more LED drive current to achieve the same output saturation. Pinout and isolation rating are identical across the family."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD817C3S","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD817C3S when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}