{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CNY173SD","brand":"onsemi","brandSlug":"onsemi","productSlug":"CNY173SD","canonicalUrl":"https://icboms.com/onsemi/CNY173SD","factsUrl":"https://icboms.com/api/mcp/products/CNY173SD","rawCanonicalId":null},"summary":{"shortDescription":"onsemi CNY173SD optocoupler, 1-channel, DC input, transistor with base output, 5300Vrms isolation, 100-200% CTR at 10mA, 6-SMD Gull Wing package, Tape & Reel.","salesMarkdown":"onsemi has marked the CNY173SD as Obsolete. This part is sourced through independent distribution channels — quantities are lot-specific and confirmed at RFQ. No stock-holding claim; availability confirmed per request. ## 5300Vrms isolation and CTR range The current transfer ratio (CTR) is specified at 100% minimum and 200% maximum, both at 10mA forward current. That 2:1 spread means the designer must budget enough drive current on the input side and enough pull-up margin on the output side to guarantee the logic threshold is crossed across all temperature and aging conditions. ## DC input, transistor output with base access This is a DC-input optocoupler with a phototransistor output that brings the base terminal out to a separate pin. The base-access pin lets you add a base-emitter resistor to tailor the switching threshold or speed, or to bias the transistor for analog signal transfer. The output transistor is rated for 70V maximum collector-emitter voltage and 50mA continuous current per channel. Vce saturation is 300mV max — at 50mA that's 15mW dissipation in the output stage, well within the package limits at 100°C ambient. ## Switching speed and temperature range Typical turn-on time is 2µs, turn-off time 3µs, with rise and fall times of 1µs and 2µs respectively. These numbers place the CNY173SD in the medium-speed class — adequate for 50/60Hz line synchronisation, relay drivers, and PLC input modules, but not for high-speed digital isolation above a few hundred kHz.","metaTitle":"onsemi CNY173SD Optoisolator, 5300Vrms, 6-SMD Gull Wing","metaDescription":"onsemi CNY173SD optocoupler, 5300Vrms isolation, 100-200% CTR at 10mA, DC input, transistor output.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Optoisolators"],"specifications":{"Mfr":"onsemi","Series":"-","Package":"Tape & Reel (TR)","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":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/4a47ea3b51cbb13a83c8d83e21910005.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CNY173SD/alternatives.json"},"ai":{"faq":[{"question":"What is the current transfer ratio (CTR) of the CNY173SD?","answer":"100% minimum and 200% maximum, both specified at 10mA forward current. The 2:1 spread means the input drive and output pull-up must be designed to accommodate the full range across temperature and lifetime."},{"question":"What package does the CNY173SD come in?","answer":"6-SMD Gull Wing, supplied in Tape & Reel. The package has a standard surface-mount footprint with gull-wing leads for automated solder reflow assembly."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/CNY173SD","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/CNY173SD when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T06:27:22.907Z","lastPublished":"2026-07-21T06:27:22.907Z","indexable":true}}