{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MOC3043SR2M","brand":"onsemi","brandSlug":"onsemi","productSlug":"MOC3043SR2M","canonicalUrl":"https://icboms.com/onsemi/MOC3043SR2M","factsUrl":"https://icboms.com/api/mcp/products/MOC3043SR2M","rawCanonicalId":null},"summary":{"shortDescription":"onsemi MOC3043SR2M optoisolator, triac output, 1 channel, 4170Vrms isolation, 400V off-state, zero-crossing circuit, 6-SMD gull wing package, tape & reel.","salesMarkdown":"## Triac-output optoisolator with zero-crossing detection The onsemi MOC3043SR2M is a single-channel optoisolator with a triac output, designed to drive power triacs or directly switch low-power AC loads up to 400 V off-state. The integrated zero-crossing circuit triggers the output when the AC line voltage crosses near zero, which minimises inrush current and conducted EMI when switching resistive or lightly inductive loads. ## Zero-crossing switching and dV/dt immunity The zero-crossing circuit ensures the triac turns on only when the AC mains voltage is within approximately ±1.3 V of the zero crossing. This soft-start behaviour reduces the harmonic content of the load current and extends the life of downstream components such as relays and lamp filaments. A minimum static dV/dt rating of 1 kV/µs means the optoisolator will not falsely trigger on fast voltage transients from nearby inductive switching — a common failure mode in motor-drive and solenoid circuits without a snubber. The typical hold current of 400 µA keeps the triac latched once triggered, preventing premature dropout at low load currents. The maximum LED trigger current of 5 mA allows direct drive from standard logic or microcontroller GPIO pins through a series resistor. ## Surface-mount package and reel options Housed in a 6-SMD gull-wing package (6-SMD, Gull Wing), the MOC3043SR2M is suited for automated pick-and-place assembly.","metaTitle":"onsemi MOC3043SR2M Optoisolator, Triac Output, 4170Vrms","metaDescription":"onsemi MOC3043SR2M optoisolator with triac output, 4170Vrms isolation, zero-crossing circuit, UL recognized. Active production, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Triac","Mounting Type":"Surface Mount","Package / Case":"6-SMD, Gull Wing","Approval Agency":"UL","lifecycle_stage":"eol_hot","Number of Channels":"1","Static dV/dt (Min)":"1kV/µs","Current - Hold (Ih)":"400µA (Typ)","Voltage - Isolation":"4170Vrms","Voltage - Off State":"400 V","Operating Temperature":"-40°C ~ 85°C","Zero Crossing Circuit":"Yes","Supplier Device Package":"6-SMD","Voltage - Forward (Vf) (Typ)":"1.25V","Current - DC Forward (If) (Max)":"60 mA","Current - LED Trigger (Ift) (Max)":"5mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.09","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.09000","currency":"USD"},{"qty":10,"price":"$0.71200","currency":"USD"},{"qty":100,"price":"$0.46670","currency":"USD"},{"qty":1000,"price":"$0.36845","currency":"USD"},{"qty":2000,"price":"$0.34389","currency":"USD"},{"qty":5000,"price":"$0.33160","currency":"USD"},{"qty":10000,"price":"$0.32669","currency":"USD"},{"qty":25000,"price":"$0.31932","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between MOC3043SR2M and MOC3073SVM?","answer":"The MOC3043SR2M includes a zero-crossing circuit; the MOC3073SVM does not. Both have the same 1 kV/µs dV/dt rating, 4170Vrms isolation, and triac output, but the MOC3073SVM comes in a tube package, not tape and reel. The zero-crossing feature of the MOC3043SR2M makes it the better choice for switching loads where inrush current must be minimised."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/MOC3043SR2M","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/MOC3043SR2M when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}