{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MOC3021VM","brand":"onsemi","brandSlug":"onsemi","productSlug":"MOC3021VM","canonicalUrl":"https://icboms.com/onsemi/MOC3021VM","factsUrl":"https://icboms.com/api/mcp/products/MOC3021VM","rawCanonicalId":null},"summary":{"shortDescription":"onsemi MOC3021VM optoisolator, Triac output, 1 channel, 4170Vrms isolation, 400V off-state, no zero-crossing, Through Hole, 6-DIP, Tube.","salesMarkdown":"## Triac output for random-phase AC switching The onsemi MOC3021VM is a single-channel optoisolator with a Triac output in a 6-DIP through-hole package. It provides 4170 Vrms isolation between the LED input and the Triac output, rated for 400 V off-state voltage — sufficient for switching 240 VAC loads directly from a logic-level signal. With no zero-crossing circuit, the Triac fires at any point in the AC cycle on receipt of the LED trigger current. This random-phase turn-on is essential for phase-angle control applications like resistive heater regulation or incandescent lamp dimming, where the load must be switched on mid-cycle. The hold current of 100 µA (typical) keeps the Triac latched once triggered, so the LED can be de-energized after turn-on to reduce driver power. ## Industrial temperature range and approvals The part carries IEC/EN/DIN and UL approvals — these are the safety-agency certifications required for equipment sold into European and North American markets. The 4170 Vrms isolation rating satisfies reinforced-insulation requirements for mains-connected circuits per IEC 60950 and UL 1577. ## Package and board-fit for through-hole assembly The through-hole leads provide a robust mechanical anchor on the PCB, preferred over surface-mount in high-vibration environments or when the board sees repeated thermal cycling. Supplied in Tube packaging — each tube holds a fixed quantity of devices for manual or automated insertion. The 6-DIP supplier device package code matches the case outline; no additional footprint adaptation is needed beyond the standard DIP-6 land pattern. ## Sourcing and cross-reference considerations When sourcing the MOC3021VM, the closest functional peer in the same package is the MOC3073M. Both are through-hole 6-DIP, single-channel Triac optoisolators with 4170 Vrms isolation and no zero-crossing. The MOC3073M specifies a static dv/dt of 1 kV/µs, which is higher than the MOC3021VM's unspecified but typically lower dv/dt rating — meaning the MOC3073M is more immune to false triggering on fast mains transients. For a direct drop-in without rewiring, the MOC3021VM fits the same footprint and pinout.","metaTitle":"onsemi MOC3021VM Optoisolator, Triac Output, 400V, 6-DIP","metaDescription":"onsemi MOC3021VM 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":"Through Hole","Package / Case":"6-DIP (0.300\\\", 7.62mm)","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-DIP","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":"$0.7700","priceTiers":[{"qty":1,"price":"$0.77000","currency":"USD"},{"qty":10,"price":"$0.50300","currency":"USD"},{"qty":100,"price":"$0.32930","currency":"USD"},{"qty":1000,"price":"$0.25997","currency":"USD"},{"qty":2000,"price":"$0.24264","currency":"USD"},{"qty":5000,"price":"$0.23398","currency":"USD"},{"qty":10000,"price":"$0.23051","currency":"USD"},{"qty":25000,"price":"$0.22531","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/12f74b3254c1e0370a4fb6eb3d6dbd88.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/MOC3021VM/alternatives.json"},"ai":{"faq":[{"question":"What is the output type and switching behavior of MOC3021VM?","answer":"The output is a Triac with no zero-crossing circuit. This means the Triac fires at any point in the AC cycle when the LED trigger current exceeds the 15 mA maximum threshold. It is used for random-phase switching applications like phase-angle control of resistive loads."},{"question":"Will MOC3021VM drop into a board designed for MOC3073M?","answer":"Yes, both parts share the same 6-DIP through-hole package, pinout, and 4170 Vrms isolation rating. The MOC3073M has a higher static dv/dt (1 kV/µs) for better transient immunity, but the MOC3021VM is a functional drop-in without rewiring."},{"question":"What compliance documentation does onsemi provide for MOC3021VM?","answer":"The part carries IEC/EN/DIN and UL safety agency approvals. It is ROHS3 compliant. onsemi provides a datasheet with detailed specifications, isolation test voltages, and application notes for the MOC302 series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/MOC3021VM","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/MOC3021VM 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}}