{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CNY172S","brand":"onsemi","brandSlug":"onsemi","productSlug":"CNY172S","canonicalUrl":"https://icboms.com/onsemi/CNY172S","factsUrl":"https://icboms.com/api/mcp/products/CNY172S","rawCanonicalId":null},"summary":{"shortDescription":"onsemi CNY172S optocoupler, 1-channel DC input, transistor with base output, 5300Vrms isolation, 63-125% CTR, 6-SMD Gull Wing package, Tube.","salesMarkdown":"The CNY172S is listed as obsolete by onsemi, meaning the manufacturer has discontinued production. No pin-compatible direct replacement is documented from onsemi. ## Isolation and signal transfer — what the ratings mean Rated for 5300Vrms isolation, this optocoupler provides galvanic separation between the DC input side and the transistor output — suitable for safety barriers in industrial controls, PLCs, and power-supply feedback loops where transient isolation is required. The current transfer ratio (CTR) spans 63% to 125% at a forward current of 10 mA, which defines the minimum output current the phototransistor can sink for a given LED drive — a 63% floor ensures the downstream logic sees a valid high even with LED degradation over temperature and time. With a typical turn-on time of 2 µs and turn-off of 3 µs, the CNY172S switches at speeds adequate for 100 kHz-class signals — the 1 µs rise and 2 µs fall times are consistent with a standard phototransistor output, not a high-speed logic gate. Housed in a 6-SMD Gull Wing package (supplier device package 6-SMD), the part is a surface-mount optocoupler with a standard 7.62 mm pitch — the gull-wing leads are compatible with reflow soldering and visual inspection. Operating temperature range of -55°C to 100°C covers industrial and some automotive under-hood environments — the upper limit is 100°C, so derating is needed if the ambient near the optocoupler exceeds that. ## Sourcing posture No franchised stock or manufacturer lead time applies.","metaTitle":"onsemi CNY172S Optoisolator, 5300Vrms, 6-SMD Gull Wing","metaDescription":"onsemi CNY172S optocoupler, 1-channel DC input, transistor output, 5300Vrms isolation, 63-125% CTR, 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 with Base","Mounting Type":"Surface Mount","Package / Case":"6-SMD, Gull Wing","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Number of Channels":"1","Base Product Number":"CNY172","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)":"125% @ 10mA","Current Transfer Ratio (Min)":"63% @ 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":"$0.0900","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/4a47ea3b51cbb13a83c8d83e21910005.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CNY172S/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the CNY172S?","answer":"No official pin-compatible successor is documented by onsemi. The base product number CNY172 shares the same family but may have different CTR bins or package options — verify the specific BOM position before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/CNY172S","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/CNY172S when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T06:26:33.820Z","lastPublished":"2026-07-21T06:26:33.820Z","indexable":true}}