{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4N28M","brand":"onsemi","brandSlug":"onsemi","productSlug":"4N28M","canonicalUrl":"https://icboms.com/onsemi/4N28M","factsUrl":"https://icboms.com/api/mcp/products/4N28M","rawCanonicalId":null},"summary":{"shortDescription":"onsemi 4N28M, 1-channel DC-input optoisolator, transistor with base output, 4170Vrms isolation, 6-DIP through-hole package, tube","salesMarkdown":"## Isolation voltage and signal path for industrial BOMs The 4N28M is a 1-channel DC-input optoisolator with a transistor-with-base output, rated for 4170Vrms isolation between input and output sides. That isolation rating suits it for breaking ground loops and protecting low-voltage logic on the secondary side in motor drives, PLC digital inputs, and power-supply feedback paths. Typical turn-on and turn-off times of 2 µs each limit the useful switching frequency to roughly 100 kHz — adequate for 50/60 Hz line synchronisation, relay coil drive, or slow serial isolation. ## Temperature range and output drive limits Maximum output voltage is 30 V, and Vce saturation is 500 mV max at rated current — the output can pull a 5 V or 24 V logic input low with margin. Forward voltage typical is 1.18 V at 10 mA, and the LED can be driven up to 60 mA continuous. ## Active lifecycle — no immediate obsolescence risk For BOM planning, this means the part can be specified without a near-term requalification trigger, though sourcing should still be confirmed per order to avoid allocation shifts.","metaTitle":"4N28M onsemi Optoisolator – 4170Vrms, Transistor Output","metaDescription":"onsemi 4N28M optoisolator: 4170Vrms isolation, 10% CTR min, 2µs switching, -40°C to 100°C. Active production, 6-DIP through-hole.","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":"Through Hole","Package / Case":"6-DIP (0.300\\\", 7.62mm)","Product Status":"Active","lifecycle_stage":"eol_hot","Number of Channels":"1","Base Product Number":"4N28","Voltage - Isolation":"4170Vrms","Vce Saturation (Max)":"500mV","Operating Temperature":"-40°C ~ 100°C","Rise / Fall Time (Typ)":"-","Voltage - Output (Max)":"30V","Supplier Device Package":"6-DIP","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":"$0.6700","priceTiers":[{"qty":1,"price":"$0.70000","currency":"USD"},{"qty":10,"price":"$0.46100","currency":"USD"},{"qty":100,"price":"$0.30490","currency":"USD"},{"qty":1000,"price":"$0.23543","currency":"USD"},{"qty":2000,"price":"$0.21274","currency":"USD"},{"qty":5000,"price":"$0.19856","currency":"USD"},{"qty":10000,"price":"$0.19147","currency":"USD"},{"qty":25000,"price":"$0.18863","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/d7db4dc53d56bf7e534658a700fb47e3.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/4N28M/alternatives.json"},"ai":{"faq":[{"question":"Can 4N28M replace 4N25?","answer":"The 4N28M and 4N25 share the same 6-DIP package and 4170Vrms isolation rating, but the 4N28M has a transistor-with-base output, while the 4N25 is a simple phototransistor. The base connection on the 4N28M allows external bias or feedback, which can improve switching speed or sensitivity. Pin-for-pin compatibility depends on the base pin being left open or used — check the circuit before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/4N28M","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/4N28M 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}}