{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"4N27SM","brand":"onsemi","brandSlug":"onsemi","productSlug":"4N27SM","canonicalUrl":"https://icboms.com/onsemi/4N27SM","factsUrl":"https://icboms.com/api/mcp/products/4N27SM","rawCanonicalId":null},"summary":{"shortDescription":"onsemi 4N27SM optoisolator, 1-channel DC input, transistor with base output, 4170 Vrms isolation, 6-SMD gull wing surface mount package, -40°C to 100°C, active production.","salesMarkdown":"## 4170 Vrms isolation in a 6-SMD gull-wing package The 4N27SM is a single-channel optoisolator from onsemi, with a DC input driving a phototransistor with base access. Its 4170 Vrms isolation rating (cite:) provides a reinforced safety barrier for separating low-voltage control circuits from higher-voltage load sides — typical in motor drives, PLC I/O modules, and SMPS feedback loops. The 6-SMD gull-wing package (cite:) is surface-mountable, saving board space compared to through-hole DIP variants. ## 500 mV Vce saturation — load drop matters Vce saturation is specified at 500 mV max at 10 mA forward current. This is the voltage the output transistor drops when fully on — higher than the 4N35SM's 300 mV, so at the same load current the 4N27SM dissipates more power. The 4N28SM shares the same 500 mV spec, making it a drop-in alternative if the 4N27SM is unavailable. ## Industrial temperature range and switching speed Operating temperature spans -40°C to 100°C (cite:), covering industrial enclosures and outdoor telecom cabinets without derating. Typical turn-on and turn-off times are 2 µs each (cite:) — fast enough for 100 kHz switching or isolated data transmission at moderate rates. The base terminal allows external bias adjustment or Miller clamp, giving the designer control over switching behaviour.","metaTitle":"4N27SM Optoisolator – onsemi, 4170 Vrms, 6-SMD Gull Wing","metaDescription":"onsemi 4N27SM optoisolator: 4170 Vrms isolation, transistor with base output, 6-SMD gull wing, -40°C to 100°C, active.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Tube","Input Type":"DC","Output Type":"Transistor with Base","Mounting Type":"Surface Mount","Package / Case":"6-SMD, Gull Wing","lifecycle_stage":"eol_hot","Number of Channels":"1","Voltage - Isolation":"4170Vrms","Vce Saturation (Max)":"500mV","Operating Temperature":"-40°C ~ 100°C","Voltage - Output (Max)":"30V","Supplier Device Package":"6-SMD","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":"$0.64","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.64000","currency":"USD"},{"qty":10,"price":"$0.42000","currency":"USD"},{"qty":100,"price":"$0.27750","currency":"USD"},{"qty":1000,"price":"$0.21427","currency":"USD"},{"qty":2000,"price":"$0.19362","currency":"USD"},{"qty":5000,"price":"$0.18071","currency":"USD"},{"qty":10000,"price":"$0.17426","currency":"USD"},{"qty":25000,"price":"$0.17167","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/d7db4dc53d56bf7e534658a700fb47e3.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Can I replace a through-hole 4N27 with the 4N27SM surface-mount version?","answer":"Yes — the 4N27SM is the surface-mount variant of the 4N27, sharing the same die and electrical characteristics: 4170 Vrms isolation (cite:), 500 mV Vce saturation (cite:), and 2 µs switching times (cite:). The only difference is the 6-SMD gull-wing package (cite:) instead of a through-hole DIP. Your PCB layout must accommodate the surface-mount footprint; the pinout is identical."},{"question":"Is the 4N27SM RoHS compliant?","answer":"Yes, the 4N27SM is ROHS3 compliant (cite:), meaning it meets the latest EU directive restricting lead, mercury, cadmium, and other hazardous substances."},{"question":"What is the closest functional second-source to the 4N27SM?","answer":"The 4N28SM (cite:) is the nearest functional alternative — same 4170 Vrms isolation, same 500 mV Vce saturation, same package and pinout. The 4N35SM (cite:) offers a lower 300 mV Vce saturation but is otherwise interchangeable. Both are active onsemi parts and can be sourced through the same RFQ process."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/4N27SM","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/4N27SM when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T20:07:01.962Z","lastPublished":"2026-07-17T20:07:01.962Z","indexable":true}}