{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CNY17F43S","brand":"onsemi","brandSlug":"onsemi","productSlug":"CNY17F43S","canonicalUrl":"https://icboms.com/onsemi/CNY17F43S","factsUrl":"https://icboms.com/api/mcp/products/CNY17F43S","rawCanonicalId":null},"summary":{"shortDescription":"onsemi CNY17F43S optoisolator, 1-channel, DC input, transistor output, 5300Vrms isolation, 160-320% CTR, 6-SMD gull wing, tube.","salesMarkdown":"## Isolation barrier and CTR — what they mean for the BOM The CNY17F43S provides 5300Vrms galvanic isolation between input and output — this is a peak test voltage, not a working voltage rating, but it certifies the part for reinforced isolation in mains-referenced circuits per IEC 60950-1. The 1.35V typical forward voltage and 100 mA max forward current define the LED drive budget. Current transfer ratio (CTR) is 160% minimum and 320% maximum at 10 mA forward current — this range tells you the output transistor saturation margin across the full production spread. At the low end, 160% CTR means 16 mA collector current for 10 mA in; the 300 mV Vce(sat) max ensures the output pulls low enough for TTL or 3.3V logic inputs. ## Switching speed and temperature range Turn-on time is 2 µs typical, turn-off 3 µs typical, with rise/fall times of 1 µs and 2 µs respectively — this part is suited for 10-100 kHz signal isolation, not high-speed data links. The -55°C to 100°C operating range covers industrial and military temperature grades; the 70V maximum output voltage allows direct interface to 48V rails or 24V PLC inputs with margin. ## Obsolete — supply posture onsemi has marked the CNY17F43S as Obsolete. For a pin-compatible alternative within the same CNY17 family, the active variants (e.g., CNY17F-1, CNY17F-2, CNY17F-3) share the same 6-SMD gull wing footprint and 5300Vrms isolation but differ in CTR bin — the '43S' suffix corresponds to the 160-320% range. Verify the CTR requirement before substituting.","metaTitle":"onsemi CNY17F43S Optoisolator, 5300Vrms, 160-320% CTR","metaDescription":"onsemi CNY17F43S optoisolator, 1-channel, 5300Vrms isolation, 160-320% CTR at 10mA, 6-SMD gull wing. 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":"Tube","Input Type":"DC","Output Type":"Transistor","Mounting Type":"Surface Mount","Package / Case":"6-SMD, Gull Wing","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Number of Channels":"1","Base Product Number":"CNY17","Voltage - Isolation":"5300Vrms","Vce Saturation (Max)":"300mV","Operating Temperature":"-55°C~100°C","Rise / Fall Time (Typ)":"1µs, 2µs","Voltage - Output (Max)":"70V","Supplier Device Package":"6-SMD","Current - Output / Channel":"50mA","Current Transfer Ratio (Max)":"320% @ 10mA","Current Transfer Ratio (Min)":"160% @ 10mA","Voltage - Forward (Vf) (Typ)":"1.35V","Turn On / Turn Off Time (Typ)":"2µs, 3µs","Current - DC Forward (If) (Max)":"100 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/4a47ea3b51cbb13a83c8d83e21910005.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CNY17F43S/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the CNY17F43S?","answer":"Active variants in the same CNY17 family (CNY17F-1, CNY17F-2, CNY17F-3) share the 6-SMD gull wing footprint, 5300Vrms isolation, and DC input. The key difference is the CTR bin: the '43S' suffix specifies 160-320% at 10 mA. Match the CTR range to your design before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/CNY17F43S","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/CNY17F43S when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T06:31:21.949Z","lastPublished":"2026-07-21T06:31:21.949Z","indexable":true}}