{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CNY172SD","brand":"onsemi","brandSlug":"onsemi","productSlug":"CNY172SD","canonicalUrl":"https://icboms.com/onsemi/CNY172SD","factsUrl":"https://icboms.com/api/mcp/products/CNY172SD","rawCanonicalId":null},"summary":{"shortDescription":"onsemi CNY172SD optoisolator, single-channel phototransistor output, DC input, 5300Vrms isolation, 63-125% CTR at 10mA, 6-SMD Gull Wing package, Tape & Reel.","salesMarkdown":"## 5300Vrms isolation in a 6-SMD gull-wing package The CNY172SD is a single-channel phototransistor optoisolator from onsemi, designed to pass a DC signal across a galvanic barrier rated at 5300Vrms. That isolation voltage covers reinforced insulation requirements per IEC 60950-1 for mains-rated equipment — a common spec for medical power supplies, industrial AC-line monitoring, and motor-drive feedback paths where the control side must stay isolated from the high-voltage bus. The current transfer ratio spans 63% minimum to 125% maximum, both measured at 10mA forward current. This CTR window is tight enough that a single resistor on the output pull-up covers the full production spread without a gain trim — useful when the opto feeds a digital input on a PLC or MCU. Switching is spec'd at 1µs rise and 2µs fall typical, with turn-on at 2µs and turn-off at 3µs. That puts the usable data rate around 100 kbit/s — fine for 50/60 Hz zero-cross detect, relay-driver feedback, or slow serial isolation, but not for high-speed comms like CAN or RS-485. onsemi has marked the CNY172SD as obsolete. No last-time-buy window remains open. The 6-SMD gull-wing package and 5300Vrms isolation rating are the two dimensions that matter most when searching for a functional drop-in. Any replacement must match the footprint (6-SMD, 7.62mm lead pitch typical for this class) and the isolation voltage to avoid a board spin or safety re-certification. ## Temperature grade and operating limits Rated for -55°C to +100°C ambient, the CNY172SD covers industrial and some military-temperature applications. The output transistor can handle up to 70V collector-emitter and 50mA continuous — enough to drive a small relay coil or a logic gate input directly. Forward voltage is 1.35V typical at 10mA, with an absolute maximum forward current of 100mA.","metaTitle":"onsemi CNY172SD Optoisolator, 5300Vrms, 63-125% CTR, 6-SMD","metaDescription":"onsemi CNY172SD single-channel phototransistor optoisolator, 5300Vrms isolation, 63-125% CTR at 10mA.","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":"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":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/4a47ea3b51cbb13a83c8d83e21910005.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/CNY172SD/alternatives.json"},"ai":{"faq":[{"question":"What is the CTR range of the CNY172SD?","answer":"The current transfer ratio is 63% minimum and 125% maximum, both specified at 10mA forward current. This is a standard phototransistor opto range — suitable for general-purpose isolation where the output load is a logic gate or a low-current relay."},{"question":"What package does the CNY172SD come in?","answer":"It is supplied in a 6-SMD gull-wing package (6-SMD, Gull Wing), with the supplier device package designated as 6-SMD. The part ships in Tape & Reel (TR) format."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/CNY172SD","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/CNY172SD when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T06:26:33.913Z","lastPublished":"2026-07-21T06:26:33.913Z","indexable":true}}