{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD817BW","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD817BW","canonicalUrl":"https://icboms.com/onsemi/FOD817BW","factsUrl":"https://icboms.com/api/mcp/products/FOD817BW","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD817BW single-channel transistor-output optocoupler, DC input, 5000Vrms isolation, 130-260% CTR at 5mA, 4-DIP through-hole package.","salesMarkdown":"The FOD817BW: Sourced through independent distribution against an RFQ. ## Isolation and CTR — the two fit dimensions Rated for 5000Vrms isolation — this is the withstand voltage between input LED and output phototransistor, tested per the optocoupler safety standard. Suitable for reinforced insulation in mains-referenced circuits where the galvanic barrier must survive a 5 kV transient. Current transfer ratio spans 130% to 260% at a forward current of 5 mA — the CTR band tells you how much collector current the phototransistor delivers for a given LED drive. The 130% minimum ensures the output saturates with a known collector load; the 260% ceiling means the circuit must tolerate the extra gain without oscillating or pulling the output rail low. Single-channel, transistor output, DC input — the simplest optocoupler topology. The phototransistor switches up to 70 V at 50 mA continuous, with a 200 mV Vce(sat) at rated current. ## Package and temperature grade 4-DIP through-hole package, 0.400-inch (10.16 mm) body width. The 4-DIP footprint is a standard optocoupler layout — the FOD817BW drops into the same board pattern as the broader FOD817 family. Rated for -55°C to +110°C operating ambient — this is the industrial-plus temperature band. The 110°C ceiling covers most factory-floor and outdoor telecom enclosures; the -55°C floor handles cold-start in unheated equipment shelters.","metaTitle":"onsemi FOD817BW Optoisolator, 5000Vrms, 130-260% CTR","metaDescription":"onsemi FOD817BW single-channel transistor output optocoupler. 5000Vrms isolation, 130-260% CTR at 5mA. Obsolete — sourced to order against RFQ.","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)":"260% @ 5mA","Current Transfer Ratio (Min)":"130% @ 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":"$0.0700","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 FOD817BW in this optoisolator family?","answer":"The FOD817 series shares the same 4-DIP pinout and 5000Vrms isolation rating. Within the series, different CTR bins are available — the FOD817A (80-160% CTR), FOD817B (130-260% CTR), and FOD817C (200-400% CTR) — so a pin-compatible drop-in with a different CTR range exists. No single direct replacement is designated by onsemi."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD817BW","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD817BW when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T06:32:25.577Z","lastPublished":"2026-07-21T06:32:25.577Z","indexable":true}}