{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4N28FR2M","brand":"onsemi","brandSlug":"onsemi","productSlug":"4N28FR2M","canonicalUrl":"https://icboms.com/onsemi/4N28FR2M","factsUrl":"https://icboms.com/api/mcp/products/4N28FR2M","rawCanonicalId":null},"summary":{"shortDescription":"onsemi 4N28FR2M Optoisolator, DC Input, Transistor with Base Output, 1 Channel, 7500Vpk Isolation, 6-SMD Gull Wing, Tape & Reel.","salesMarkdown":"The 4N28FR2M is officially obsolete per onsemi's lifecycle status. Sourced to order against RFQ through independent distribution channels. ## 7500Vpk isolation — 1-channel phototransistor with base access Rated for 7500Vpk isolation voltage, this part provides reinforced galvanic isolation between a DC input (IR LED) and a phototransistor output with the base brought out to a separate pin. The base-access pin allows the designer to bias the transistor for faster switching or to implement a Darlington pair externally. Minimum current transfer ratio (CTR) is 10% at 10 mA forward current — this sets the LED drive current needed to guarantee a given collector current at the output. The 60 mA absolute-maximum forward current limits the LED drive in high-temperature or high-CMR designs. Switching times are 2 µs typical for both turn-on and turn-off at the stated test conditions. This places the 4N28FR2M in the medium-speed class for optocouplers — adequate for 50/60 Hz line sensing, relay drivers, and logic-level translation below 100 kHz, but not for high-speed digital isolation. ## -55°C to 100°C — full industrial temperature range The 30V maximum collector-emitter voltage on the output side suits 24V logic rails with margin for transients. Vce saturation is 500 mV maximum at the test current — this is the voltage drop across the output transistor when fully on. In a typical 5V logic interface, the 500 mV drop leaves 4.5V at the receiver input, well above the 2.0V VIH threshold for TTL or 3.3V CMOS. ## 6-SMD gull wing — surface-mount assembly Packaged in a 6-SMD gull-wing surface-mount case (supplier device package 6-SMD). Supplied on Tape & Reel (TR) for automated pick-and-place assembly. The 1.18V typical forward voltage at 10 mA is the LED drop — design the series resistor for this value at the target forward current.","metaTitle":"onsemi 4N28FR2M Optoisolator, 7500Vpk Isolation, DC Input","metaDescription":"onsemi 4N28FR2M optoisolator, 1-channel, 7500Vpk isolation, 10% min CTR at 10mA, 6-SMD gull wing. Obsolete — sourced to order, availability confirmed at RFQ.","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":"4N28","Voltage - Isolation":"7500Vpk","Vce Saturation (Max)":"500mV","Operating Temperature":"-55°C~100°C","Rise / Fall Time (Typ)":"-","Voltage - Output (Max)":"30V","Supplier Device Package":"6-SMD","Current - Output / Channel":"-","Current Transfer Ratio (Max)":"-","Current Transfer Ratio (Min)":"10% @ 10mA","Voltage - Forward (Vf) (Typ)":"1.18V","Turn On / Turn Off Time (Typ)":"2µs, 2µs","Current - DC Forward (If) (Max)":"60 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/549fd3247d695b0763fc033a8221c221.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/4N28FR2M/alternatives.json"},"ai":{"faq":[{"question":"What is the minimum current transfer ratio (CTR) for 4N28FR2M?","answer":"10% minimum CTR at 10 mA forward current. The output phototransistor's base is brought out to a separate pin, allowing the designer to bias the transistor for faster switching or to implement a Darlington pair externally."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/4N28FR2M","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/4N28FR2M when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T06:21:48.731Z","lastPublished":"2026-07-21T06:21:48.731Z","indexable":true}}