{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MOC3042SVM","brand":"onsemi","brandSlug":"onsemi","productSlug":"MOC3042SVM","canonicalUrl":"https://icboms.com/onsemi/MOC3042SVM","factsUrl":"https://icboms.com/api/mcp/products/MOC3042SVM","rawCanonicalId":null},"summary":{"shortDescription":"onsemi MOC3042SVM zero-crossing triac optoisolator, 4170Vrms isolation, 400V off-state, 1kV/µs dV/dt, 6-SMD gull wing, tube.","salesMarkdown":"## Zero-crossing triac output for clean AC switching The onsemi MOC3042SVM is a single-channel triac-output optoisolator with a built-in zero-crossing detection circuit, rated for 4170Vrms isolation between the LED input and the triac output. The zero-crossing feature gates the triac on only when the AC line voltage is near zero, minimising the inrush current spike that occurs when switching inductive or capacitive loads — a common cause of relay contact welding and EMI bursts in solid-state relay designs. With a 400 V off-state voltage rating and a minimum static dV/dt of 1 kV/µs, this part is sized for 120 VAC or 240 VAC line switching where the triac must stay off through fast-rising transients without false triggering. ## Package and board-fit for surface-mount assembly Housed in a 6-SMD gull-wing package (supplier device package 6-SMD), the MOC3042SVM sits on the board with a standard 0.100-inch (2.54 mm) pin pitch that matches common optoisolator footprints. The tube packaging (not tape-and-reel) means this part ships in anti-static tubes for manual or low-volume pick-and-place. For high-volume reflow, confirm the tube-to-tray transfer with your assembler; the gull-wing profile is compatible with standard lead-free solder profiles per J-STD-020.","metaTitle":"onsemi MOC3042SVM Optoisolator, Triac Output, 4170Vrms","metaDescription":"onsemi MOC3042SVM zero-crossing triac optoisolator, 4170Vrms isolation, 400V off-state, 1kV/µs dV/dt. Active production, ROHS3, UL/IEC. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Tube","Output Type":"Triac","Mounting Type":"Surface Mount","Package / Case":"6-SMD, Gull Wing","Approval Agency":"IEC/EN/DIN, 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)":"10mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.41","stockQuantity":18,"priceTiers":[{"qty":1,"price":"$1.41000","currency":"USD"},{"qty":10,"price":"$0.89400","currency":"USD"},{"qty":100,"price":"$0.66180","currency":"USD"},{"qty":500,"price":"$0.60816","currency":"USD"},{"qty":1000,"price":"$0.50084","currency":"USD"},{"qty":2000,"price":"$0.47580","currency":"USD"},{"qty":5000,"price":"$0.46506","currency":"USD"},{"qty":10000,"price":"$0.45433","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between the MOC3042SVM and the MOC3073SVM?","answer":"The MOC3042SVM includes a zero-crossing detection circuit; the MOC3073SVM does not. For switching resistive or lightly inductive loads where zero-crossing turn-on is not required, the MOC3073SVM is a functional alternative — but the MOC3042SVM is the correct choice when the design relies on zero-crossing to limit inrush current."},{"question":"What compliance documentation does onsemi provide for the MOC3042SVM?","answer":"Onsemi provides UL and IEC/EN/DIN approval certification for the 4170Vrms isolation rating, plus ROHS3 compliance declaration. These documents cover the reinforced insulation requirements for mains-isolated control circuits."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/MOC3042SVM","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/MOC3042SVM 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}}