{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MOC3021SVM","brand":"onsemi","brandSlug":"onsemi","productSlug":"MOC3021SVM","canonicalUrl":"https://icboms.com/onsemi/MOC3021SVM","factsUrl":"https://icboms.com/api/mcp/products/MOC3021SVM","rawCanonicalId":null},"summary":{"shortDescription":"onsemi MOC3021SVM optoisolator, triac output, 4170Vrms isolation, 400 V off-state, no zero-crossing, surface mount 6-SMD gull wing, tube.","salesMarkdown":"## Triac-output optoisolator for resistive and inductive AC loads The onsemi MOC3021SVM is a single-channel optoisolator with a triac output, rated for 4170 Vrms isolation between the LED input side and the output triac. The 400 V off-state voltage rating means it can directly drive the gate of a power triac or SCR on a 240 VAC line without an intermediate stage. The absence of a zero-crossing circuit (no internal zero-cross detection) allows phase-angle firing — the output can be triggered at any point in the AC cycle, which is the right choice for resistive heater control or soft-start where you need to vary the power by chopping the waveform. ## Trigger current and drive margin The maximum LED trigger current (Ift) is 15 mA, and the typical forward voltage (Vf) is 1.15 V. That means a standard 5 V logic output through a 220-ohm series resistor delivers about 17 mA — enough to saturate the LED and guarantee turn-on across temperature. The 100 µA typical holding current (Ih) means the output triac stays latched once triggered, even into a lightly inductive load that might otherwise drop below the holding threshold at the zero crossing. ## Package, mounting, and board-level fit Supplied in a tube and packaged in a 6-SMD gull-wing (6-SMD, Gull Wing) surface-mount package with a 6-SMD supplier device package designation. The gull-wing leads are coplanar and self-aligning during reflow — no through-hole staking required. The 6-pin footprint is shared across the MOC302x family, so a single PCB land pattern serves the MOC3021SVM, MOC3011SM, and MOC3073SVM variants without a layout change. Listed as Active (current lifecycle stage) by onsemi. The part carries ROHS3 compliance and is approved under IEC/EN/DIN and UL standards — the UL mark is the one most North American panel builders require for a safety-isolated interface between a low-voltage controller and line-voltage AC loads.","metaTitle":"onsemi MOC3021SVM Optoisolator, Triac Output, 4170Vrms","metaDescription":"onsemi MOC3021SVM optoisolator with triac output, 4170Vrms isolation, 400V off-state, no zero-crossing. Active production, ROHS3 compliant. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Mfr":"onsemi","Series":"-","Package":"Tube","Output Type":"Triac","Turn On Time":"-","Mounting Type":"Surface Mount","Package / Case":"6-SMD, Gull Wing","Product Status":"Active","Approval Agency":"IEC/EN/DIN, UL","lifecycle_stage":"eol_hot","Number of Channels":"1","Static dV/dt (Min)":"-","Base Product Number":"MOC302","Current - Hold (Ih)":"100µA (Typ)","Voltage - Isolation":"4170Vrms","Voltage - Off State":"400 V","Operating Temperature":"-40°C~85°C","Zero Crossing Circuit":"No","Supplier Device Package":"6-SMD","Voltage - Forward (Vf) (Typ)":"1.15V","Current - DC Forward (If) (Max)":"60 mA","Current - LED Trigger (Ift) (Max)":"15mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.0800","priceTiers":[{"qty":1,"price":"$1.08000","currency":"USD"},{"qty":10,"price":"$0.70400","currency":"USD"},{"qty":100,"price":"$0.46090","currency":"USD"},{"qty":1000,"price":"$0.36390","currency":"USD"},{"qty":2000,"price":"$0.33965","currency":"USD"},{"qty":5000,"price":"$0.32751","currency":"USD"},{"qty":10000,"price":"$0.32266","currency":"USD"},{"qty":25000,"price":"$0.31538","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/12f74b3254c1e0370a4fb6eb3d6dbd88.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/MOC3021SVM/alternatives.json"},"ai":{"faq":[{"question":"Will MOC3021SVM drop into a board that was specified around MOC3011SM?","answer":"Yes, the MOC3021SVM and MOC3011SM share the same 6-SMD gull-wing package and pinout. Both are single-channel triac-output optoisolators with no zero-crossing circuit, and both are rated for 4170 Vrms isolation. The key difference is the off-state voltage: the MOC3021SVM is rated at 400 V, while the MOC3011SM is rated at 250 V. If the original design ran on a 120 VAC line, the 400 V part is a drop-in replacement with extra margin; on a 240 VAC line the 400 V rating is required."},{"question":"What compliance documentation does onsemi provide for MOC3021SVM?","answer":"The part is ROHS3 compliant and carries approvals from IEC/EN/DIN and UL. onsemi provides a RoHS certificate and the UL recognition file number on the product detail page. The UL mark covers the 4170 Vrms isolation rating for reinforced insulation in equipment up to 300 V working voltage."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/MOC3021SVM","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/MOC3021SVM when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}