{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4N28W","brand":"onsemi","brandSlug":"onsemi","productSlug":"4N28W","canonicalUrl":"https://icboms.com/onsemi/4N28W","factsUrl":"https://icboms.com/api/mcp/products/4N28W","rawCanonicalId":null},"summary":{"shortDescription":"onsemi 4N28W single-channel optoisolator, DC input, transistor with base output, 5300Vrms isolation, 6-DIP (0.400\", 10.16mm) through-hole package, tube.","salesMarkdown":"## 5300Vrms isolation in a 6-DIP package The 4N28W provides 5300Vrms galvanic isolation between the DC input and the transistor output — sufficient for isolating control signals from high-voltage power circuits in industrial and medical equipment. The 6-DIP (0.400\" row spacing) through-hole package suits legacy board layouts and retrofit replacements. Input is DC-coupled with a forward voltage of 1.18V typical at 10mA; the output transistor with base access allows external bias adjustment or a base resistor for switching threshold control. ## Speed and current transfer ratio Typical turn-on and turn-off times are 2µs each, placing the 4N28W in the medium-speed class for optoisolators — adequate for 100 kbps serial isolation or low-frequency PWM feedback. The minimum current transfer ratio is 10% at 10mA forward current, meaning the output transistor sinks at least 1mA with 10mA input drive. Vce saturation is 500mV maximum at the rated output current — the output voltage drop when the transistor is fully on stays under half a volt, preserving headroom for the downstream logic rail. ## Temperature range and compliance Rated for -55°C to 100°C operating temperature, covering industrial and extended-temperature environments. The maximum output voltage is 30V, and the forward current can reach 100mA peak — derate for continuous use above 10mA per the CTR curve.","metaTitle":"onsemi 4N28W Optoisolator, 5300Vrms, 6-DIP, Obsolete","metaDescription":"onsemi 4N28W single-channel optoisolator, 5300Vrms isolation, DC input, transistor output, 6-DIP. Obsolete — sourced to order against RFQ.","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":"Through Hole","Package / Case":"6-DIP (0.400\\\", 10.16mm)","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Number of Channels":"1","Base Product Number":"4N28","Voltage - Isolation":"5300Vrms","Vce Saturation (Max)":"500mV","Operating Temperature":"-55°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)":"100 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.2060","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cdfaf651d7a1a3387e48131363a5f4f6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/4N28W/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 4N28W?","answer":"Submit an RFQ for the 4N28W through this listing. Pricing and available quantity are confirmed at quote time from our independent distribution network."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/4N28W","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/4N28W when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T06:22:01.596Z","lastPublished":"2026-07-21T06:22:01.596Z","indexable":true}}