{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD2743BS","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD2743BS","canonicalUrl":"https://icboms.com/onsemi/FOD2743BS","factsUrl":"https://icboms.com/api/mcp/products/FOD2743BS","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD2743BS, single-channel DC-input transistor-output optoisolator, 5000Vrms isolation, 50-100% CTR at 1mA, 8-SMD Gull Wing package, -40 to 85°C operating range.","salesMarkdown":"## 5 kV isolation for safety-barrier designs The FOD2743BS delivers 5000Vrms galvanic isolation between input and output, meeting the creepage and clearance requirements for reinforced insulation in industrial power supplies, motor drives, and PLC digital inputs. With a current transfer ratio (CTR) guaranteed between 50% and 100% at 1 mA forward current, the part provides a predictable gain window that simplifies logic-level translation without overloading the output transistor. The output transistor is rated for 70 V collector-emitter and 50 mA continuous current, sufficient to drive a downstream logic gate or a low-power relay coil directly. ## Sourcing and lifecycle status The package is — not tape-and-reel — which may affect pick-and-place handling for high-volume assembly lines. Confirm your feeder compatibility before committing. ## Temperature grade and environment fit Rated for -40°C to 85°C ambient operation, the FOD2743BS suits outdoor telecom cabinets, factory-floor sensor interfaces, and HVAC controllers where the enclosure sees seasonal temperature swings. The 8-SMD Gull Wing footprint allows visual inspection of solder joints after reflow, a practical advantage for prototype builds and low-volume production where X-ray inspection is not routine.","metaTitle":"FOD2743BS onsemi Optoisolator 5kV Transistor Output 8-SMD","metaDescription":"onsemi FOD2743BS optoisolator: 5000Vrms isolation, 50-100% CTR at 1mA, -40 to 85°C, 8-SMD Gull Wing. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Bulk","Input Type":"DC","Output Type":"Transistor","Mounting Type":"Surface Mount","Package / Case":"8-SMD, Gull Wing","lifecycle_stage":"eol_hot","Number of Channels":"1","Voltage - Isolation":"5000Vrms","Vce Saturation (Max)":"400mV","Operating Temperature":"-40°C ~ 85°C","Voltage - Output (Max)":"70V","Supplier Device Package":"8-SMD","Current - Output / Channel":"50mA","Current Transfer Ratio (Max)":"100% @ 1mA","Current Transfer Ratio (Min)":"50% @ 1mA","Voltage - Forward (Vf) (Typ)":"1.07V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.98","stockQuantity":0,"priceTiers":[{"qty":378,"price":"$0.80000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/f272cb5c9be51686439d58f3a1adf9b4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is the FOD2743BS obsolete or still active?","answer":"The FOD2743BS is active with no end-of-life notification from onsemi. It remains available for new designs and ongoing production."},{"question":"What is the difference between the FOD2743BS and the FOD2743?","answer":"The FOD2743BS is the surface-mount Gull Wing variant of the FOD2743. Both share the same 5000Vrms isolation, 50-100% CTR at 1 mA, and 70 V output rating. The BS suffix indicates the 8-SMD package versus the through-hole DIP-8 of the base part."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD2743BS","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD2743BS when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T20:08:58.955Z","lastPublished":"2026-07-17T20:08:58.955Z","indexable":true}}