{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4N28TM","brand":"onsemi","brandSlug":"onsemi","productSlug":"4N28TM","canonicalUrl":"https://icboms.com/onsemi/4N28TM","factsUrl":"https://icboms.com/api/mcp/products/4N28TM","rawCanonicalId":null},"summary":{"shortDescription":"onsemi 4N28TM single-channel optoisolator, DC input, transistor with base output, 4170Vrms isolation, 6-DIP (0.400\", 10.16mm) through-hole package, tube.","salesMarkdown":"## Isolation and switching profile The 4N28TM: Typical turn-on and turn-off times are 2µs each, which puts it in the medium-speed band for optocouplers — fine for 10 kHz-ish switching or status feedback, but not for high-speed data or gate-drive applications where propagation delay skew matters. ## Package and rework reality The 6-DIP outline has a clear pin-1 indicator (a dimple or bevel at the end of the body), so orientation is unambiguous under magnification. No exposed paddle or thermal pad to worry about — just clip the leads, lift the part, and wick the holes clean. ## Lifecycle and sourcing posture Quantities are lot-specific and confirmed at RFQ; no stock-holding claim is made here.","metaTitle":"onsemi 4N28TM Optoisolator, 4170Vrms, 6-DIP, Obsolete","metaDescription":"onsemi 4N28TM single-channel transistor-output optoisolator, 4170Vrms isolation, 6-DIP through-hole. 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":"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":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cdfaf651d7a1a3387e48131363a5f4f6.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/4N28TM/alternatives.json"},"ai":{"faq":[{"question":"What is the 4N28TM's current transfer ratio (CTR)?","answer":"Minimum CTR is 10% at a forward current of 10 mA. This is a relatively low CTR — typical for a phototransistor opto with a base connection — so the downstream pull-up or load resistor must be sized to guarantee the output swings rail-to-rail at the minimum CTR."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/4N28TM","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/4N28TM when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T06:22:01.692Z","lastPublished":"2026-07-21T06:22:01.692Z","indexable":true}}