{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4N25FM","brand":"onsemi","brandSlug":"onsemi","productSlug":"4N25FM","canonicalUrl":"https://icboms.com/onsemi/4N25FM","factsUrl":"https://icboms.com/api/mcp/products/4N25FM","rawCanonicalId":null},"summary":{"shortDescription":"onsemi 4N25FM single-channel optoisolator, DC input, transistor with base output, 7500Vpk isolation, 6-SMD gull wing package, tube.","salesMarkdown":"## Obsolete — sourcing through surplus channels onsemi lists the 4N25FM as Obsolete. ## 7500Vpk isolation — what it means for the BOM The 4N25FM is rated for 7500Vpk isolation between input and output. That is a high-voltage barrier suited for separating control-side logic from a high-voltage DC bus or mains-referenced circuit — think motor drive feedback, power-supply error amplifiers, or medical patient-interface isolation where reinforced insulation is required. The minimum current transfer ratio is 20% at 10 mA forward current. Switching times are 2 µs turn-on and 2 µs turn-off typical. That puts the usable data rate around 250 kbit/s — fine for status feedback, relay replacement, or isolated I/O, but not for high-speed serial buses. ## Package and temperature grade Housed in a 6-SMD gull wing package, the 4N25FM is a surface-mount variant of the industry-standard 4N25 DIP. The supplier device package is 6-SMD.","metaTitle":"4N25FM onsemi Optoisolator, 7500Vpk, 6-SMD, Obsolete","metaDescription":"4N25FM onsemi single-channel optoisolator, 7500Vpk isolation, 20% CTR min, -55°C to 100°C. Obsolete — sourced to order via independent channels.","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":"4N25","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)":"20% @ 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/4N25FM/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 4N25FM and get a price?","answer":"The 4N25FM is sourced to order through independent distribution. No stock-holding claim is made here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/4N25FM","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/4N25FM when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T06:19:40.760Z","lastPublished":"2026-07-21T06:19:40.760Z","indexable":true}}