{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4N25SM","brand":"onsemi","brandSlug":"onsemi","productSlug":"4N25SM","canonicalUrl":"https://icboms.com/onsemi/4N25SM","factsUrl":"https://icboms.com/api/mcp/products/4N25SM","rawCanonicalId":null},"summary":{"shortDescription":"onsemi 4N25SM, single-channel DC-input optoisolator, 4170Vrms isolation, transistor with base output, 6-SMD gull-wing surface-mount package, tube packaging.","salesMarkdown":"## Isolation and switching for field-fit The 4N25SM is a single-channel optoisolator from onsemi, rated for 4170Vrms isolation between input and output. The transistor output with base access gives you flexibility to bias the transistor for faster switching or to pull the base low to force the output off. ## Current transfer ratio and drive margin Minimum current transfer ratio is 20% at 10mA forward current. That means with 10mA through the LED, the output transistor can sink at least 2mA. If your downstream load needs more, you either increase the LED current (up to 60mA max) or pick a part with higher CTR. The 4N35SM sibling drops Vce saturation to 300mV versus 500mV here, which matters if you are driving a low-voltage logic input directly. The 6-SMD gull-wing package reflows on a standard profile, but note it ships in a tube — not tape-and-reel.","metaTitle":"4N25SM Optoisolator, 4170Vrms, Transistor Output, onsemi","metaDescription":"onsemi 4N25SM optoisolator: 4170Vrms isolation, 20% min CTR at 10mA, -55°C to 100°C, surface-mount 6-SMD gull-wing. Active production, tube packaging.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","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":"Active","lifecycle_stage":"eol_hot","Number of Channels":"1","Base Product Number":"4N25","Voltage - Isolation":"4170Vrms","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":"$0.7400","priceTiers":[{"qty":1,"price":"$0.74000","currency":"USD"},{"qty":10,"price":"$0.48700","currency":"USD"},{"qty":100,"price":"$0.32200","currency":"USD"},{"qty":1000,"price":"$0.24864","currency":"USD"},{"qty":2000,"price":"$0.22468","currency":"USD"},{"qty":5000,"price":"$0.20970","currency":"USD"},{"qty":10000,"price":"$0.20221","currency":"USD"},{"qty":25000,"price":"$0.19921","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/d7db4dc53d56bf7e534658a700fb47e3.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/4N25SM/alternatives.json"},"ai":{"faq":[{"question":"What are the equivalents or substitutes for 4N25SM?","answer":"The 4N25SR2M is the same die in tape-and-reel. The 4N28SM is a functional equivalent with the same isolation and switching speed but a different base-product number. The 4N35SM offers a lower Vce saturation of 300mV versus 500mV, which helps when driving 3.3V logic directly."},{"question":"Is 4N25SM surface mount?","answer":"Yes, 6-SMD gull-wing package. Reflow-solderable on a standard profile. The tube packaging means you need a tube feeder or hand-place for prototypes."},{"question":"What is the Vce saturation of 4N25SM?","answer":"500mV maximum at the rated forward current. That is the voltage drop across the output transistor when it is on — budget that into your logic-low threshold."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/4N25SM","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/4N25SM when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}