{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4N28FR2VM","brand":"onsemi","brandSlug":"onsemi","productSlug":"4N28FR2VM","canonicalUrl":"https://icboms.com/onsemi/4N28FR2VM","factsUrl":"https://icboms.com/api/mcp/products/4N28FR2VM","rawCanonicalId":null},"summary":{"shortDescription":"onsemi 4N28FR2VM Optoisolator, DC input, Transistor with Base output, 1 Channel, 7500Vpk Isolation, 6-SMD Gull Wing, Tape & Reel.","salesMarkdown":"## 7500 Vpk isolation in a 6-SMD gull-wing package The onsemi 4N28FR2VM is a single-channel optoisolator in a 6-SMD gull-wing package, with a DC input LED and a phototransistor output that brings the base terminal out. The headline figure is the 7500 Vpk isolation voltage — this is the withstand rating between input and output, tested per the device's isolation specification. For a line-voltage interface or a medical-grade barrier where the creepage distance across the board must hold off several kilovolts, this part provides the margin a standard 5000 V isolator cannot. ## CTR floor and switching speed — what they mean for the loop The minimum current transfer ratio is 10 % at a forward current of 10 mA. This means that with 10 mA through the LED, the output transistor can sink at least 1 mA — enough to drive a TTL or CMOS gate input directly, but not enough for a relay coil without a buffer stage. The 2 µs typical turn-on and turn-off times set the upper data rate at roughly 250 kbit/s in a non-return-to-zero scheme; above that the output pulse width narrows until the downstream logic misses edges. The output transistor is rated for 30 V maximum collector-emitter voltage, with a saturation voltage of 500 mV at the rated collector current. onsemi has marked the 4N28FR2VM as obsolete. The part is sourced through independent distribution channels — quantities are lot-specific and confirmed at RFQ. For a BOM line that already carries this order code, the existing board layout and isolation rating are locked in; a board spin would be required to move to a different package or pinout. ## Temperature range and surface-mount integration Rated for -55 °C to 100 °C operating ambient, the 4N28FR2VM covers the industrial temperature band with margin into the military low end. The 6-SMD gull-wing package (supplier device package 6-SMD) is a standard surface-mount footprint — the gull-wing leads are visible for AOI inspection and reworkable with hot air. The tape-and-reel packaging suits automated pick-and-place assembly.","metaTitle":"onsemi 4N28FR2VM Optoisolator, 7500Vpk Isolation, 6-SMD","metaDescription":"onsemi 4N28FR2VM optoisolator, 7500Vpk isolation, 10% min CTR at 10mA, 2µs switching, -55°C to 100°C. Obsolete, sourced to order. Request 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/4N28FR2VM/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the 4N28FR2VM?","answer":"The base product number 4N28 is a JEDEC-registered optoisolator family; several manufacturers offer 4N28 variants in the same 6-DIP or 6-SMD footprint, but pin compatibility and CTR grading vary. Confirm the BOM position's CTR floor and isolation requirement before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/4N28FR2VM","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/4N28FR2VM when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T06:21:51.191Z","lastPublished":"2026-07-21T06:21:51.191Z","indexable":true}}