{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CNY173S","brand":"onsemi","brandSlug":"onsemi","productSlug":"CNY173S","canonicalUrl":"https://icboms.com/onsemi/CNY173S","factsUrl":"https://icboms.com/api/mcp/products/CNY173S","rawCanonicalId":null},"summary":{"shortDescription":"onsemi CNY173S single-channel optoisolator, DC input, transistor with base output, 5300Vrms isolation, 100-200% CTR, 6-SMD gull wing package, tube.","salesMarkdown":"onsemi has marked the CNY173S as obsolete, meaning the original manufacturer no longer produces this part. New-old-stock and surplus inventory are sourced through independent distribution channels. For a BOM line that requires this exact 5300Vrms isolation and 100-200% CTR window, the existing inventory is the only path. ## 5300Vrms isolation and CTR window The 5300Vrms isolation rating qualifies this optoisolator for reinforced insulation in mains-connected circuits — think AC line monitoring, motor drive feedback, or medical equipment where the safety barrier must hold off transient overvoltages. Current transfer ratio (CTR) is specified at 100% minimum to 200% maximum at If=10mA. This 2:1 window means the output transistor saturates reliably across the full input current range, but the designer must budget the minimum CTR for worst-case LED degradation over temperature and life. Output side handles up to 70V and 50mA continuous — suitable for driving logic inputs, PLC digital inputs, or low-power relays. The 300mV Vce saturation at rated current keeps the voltage drop low enough to avoid pulling the output rail down. ## Switching speed and temperature range Rise/fall times of 1µs and 2µs typical, with turn-on/turn-off at 2µs and 3µs typical, limit this part to low-speed isolation — think 10kHz or below. It works for DC state sensing, switch debouncing, or 50/60Hz zero-cross detection, but not for high-speed serial isolation. The -55°C to 100°C operating range covers industrial enclosures and some military/aerospace environments. The 6-SMD gull wing package mounts on standard surface-mount pads with a 1.6mm PCB thickness profile — no special reflow profile beyond the standard lead-free solder curve.","metaTitle":"onsemi CNY173S Optoisolator, 5300Vrms, 6-SMD Gull Wing","metaDescription":"Obsolete onsemi CNY173S single-channel optoisolator, 5300Vrms isolation, 100-200% CTR at 10mA, 6-SMD gull wing package.","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":"CNY173","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)":"200% @ 10mA","Current Transfer Ratio (Min)":"100% @ 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":"$0.6800","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/e34b4a420dd134390615c9fed8bb5f31.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CNY173S/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the CNY173S?","answer":"The base product number CNY173 shares the same die but in a different package variant; verify the package before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/CNY173S","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/CNY173S when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T06:27:20.904Z","lastPublished":"2026-07-21T06:27:20.904Z","indexable":true}}