{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD817W","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD817W","canonicalUrl":"https://icboms.com/onsemi/FOD817W","factsUrl":"https://icboms.com/api/mcp/products/FOD817W","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD817 series single-channel DC-input transistor-output optocoupler, 5000Vrms isolation, 50-600% CTR, 4-DIP (0.400\", 10.16mm) through-hole package, Box.","salesMarkdown":"## Lifecycle reality — obsolete, not NRND onsemi has marked the FOD817W as Obsolete — this is a full end-of-life status, not a not-recommended-for-new-designs (NRND) flag. Any available stock is date-code-lot-specific; quantities and pricing are confirmed only at the time of an RFQ. The absence of a formal LTB means the remaining supply is whatever the secondary market holds — no guaranteed pipeline. ## Isolation and transfer ratio — what the specs mean for fit The 5000Vrms isolation rating qualifies this optocoupler for reinforced insulation in mains-referenced circuits — think AC-DC power supplies, motor-drive feedback, and industrial PLC I/O where the primary and secondary sides must be galvanically separated. The 4-DIP package provides the creepage distance to sustain that voltage across the moulding. Current transfer ratio spans 50% minimum to 600% maximum at a forward current of 5 mA. That wide CTR window means the same part number can serve both low-duty-cycle logic-level interfaces (where a 50% CTR is enough to saturate the output transistor) and higher-current loads up to 50 mA — but the design must tolerate the full CTR spread without changing bias resistors. Rise and fall times of 4 µs and 3 µs limit the switching frequency to roughly 100 kHz — fine for 50/60 Hz line-sync and low-speed serial, but not for high-speed isolated data links. ## Temperature grade and operating envelope Rated for -55°C to +110°C ambient, the FOD817W covers industrial and some military/aerospace temperature ranges. The 1.2 V typical forward voltage and 50 mA max forward current set the LED drive budget — at 5 mA the CTR is specified, but the LED can be pulsed higher for short-duration signalling if the thermal rise across the DIP moulding stays within limits.","metaTitle":"onsemi FOD817W Optoisolator, 5000Vrms, DIP-4, Obsolete","metaDescription":"onsemi FOD817W single-channel transistor output optocoupler, 5000Vrms isolation, 50-600% CTR, DIP-4. Obsolete — sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Optoisolators"],"specifications":{"Mfr":"onsemi","Series":"-","Package":"Box","Input Type":"DC","Output Type":"Transistor","Mounting Type":"Through Hole","Package / Case":"4-DIP (0.400\\\", 10.16mm)","Product Status":"Obsolete","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-DIP","Current - Output / Channel":"50mA","Current Transfer Ratio (Max)":"600% @ 5mA","Current Transfer Ratio (Min)":"50% @ 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":"$0.6100","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/97f795ec3476128abe24ed3f2e223d6c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the FOD817W in the same family?","answer":"The base product number FOD817 covers multiple CTR-binned variants (FOD817A, FOD817B, FOD817C, FOD817D, and the FOD817W) — all share the same 4-DIP pinout and 5000Vrms isolation. The FOD817W is the widest CTR bin (50-600%). A tighter-bin sibling (e.g. FOD817B with 130-260% CTR) may substitute if the design can tolerate the narrower range, but no official cross-reference is published by onsemi."},{"question":"What compliance documentation does onsemi provide for the FOD817W?","answer":"Buyers should request the latest compliance and material declaration from the supplier at the time of order, as obsolete parts may not carry current documentation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD817W","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD817W when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T06:32:59.192Z","lastPublished":"2026-07-21T06:32:59.192Z","indexable":true}}