{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MOC3021M","brand":"onsemi","brandSlug":"onsemi","productSlug":"MOC3021M","canonicalUrl":"https://icboms.com/onsemi/MOC3021M","factsUrl":"https://icboms.com/api/mcp/products/MOC3021M","rawCanonicalId":null},"summary":{"shortDescription":"onsemi MOC3021M, 1-channel optoisolator with triac output, 4170 Vrms isolation, 400 V off-state voltage, non-zero-crossing, through-hole 6-DIP package","salesMarkdown":"## What this optotriac does on the board The MOC3021M is a 1-channel optoisolator with a triac output from onsemi, built to switch AC loads from a low-voltage logic or microcontroller signal while keeping the two sides galvanically separated. The 4170 Vrms isolation rating means it can sit across the mains isolation barrier in equipment like solid-state relays, motor starters, or lighting controls without flashover. Because it has no zero-crossing circuit, the triac fires at whatever point in the AC cycle the LED turns on. That makes it a fit for phase-angle dimming or soft-start applications where you need to trigger partway through the half-cycle, not just at the zero crossing. ## Key ratings for your BOM decision Off-state voltage is 400 V, so the triac blocks line voltage up to 400 V peak when off. That covers 120 VAC and 240 VAC mains with margin. The LED trigger current is 15 mA max — a standard 20 mA LED drive from a 5 V logic rail through a 220 Ω resistor will fire it reliably. Forward voltage is 1.15 V typical, and the LED can take up to 60 mA continuous without damage. Hold current is 100 µA typical — once the triac latches, it stays on as long as the load current stays above that threshold. Below 100 µA the triac drops out at the next zero crossing, which is normal for resistive loads. Inductive loads need a snubber network to keep the dV/dt below the triac's commutating limit. onsemi lists the MOC3021M as Active and ROHS3 compliant.","metaTitle":"MOC3021M onsemi Optoisolator Triac Output 6-DIP","metaDescription":"MOC3021M onsemi optoisolator with triac output, 4170 Vrms isolation, 400 V off-state, non-zero-crossing, through-hole 6-DIP. Active production. Request quote.","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":"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":"$0.8400","priceTiers":[{"qty":1,"price":"$0.85000","currency":"USD"},{"qty":10,"price":"$0.55100","currency":"USD"},{"qty":100,"price":"$0.36090","currency":"USD"},{"qty":1000,"price":"$0.28493","currency":"USD"},{"qty":2000,"price":"$0.26594","currency":"USD"},{"qty":5000,"price":"$0.25644","currency":"USD"},{"qty":10000,"price":"$0.25264","currency":"USD"},{"qty":25000,"price":"$0.24694","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/12f74b3254c1e0370a4fb6eb3d6dbd88.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/MOC3021M/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to MOC3021M?","answer":"The MOC3021M is part of the MOC302x family (base number MOC302,). Other members like MOC3020M or MOC3022M share the same 6-DIP pinout and triac output but differ in LED trigger current or off-state voltage. The MOC3021M sits in the middle with a 15 mA trigger and 400 V off-state."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/MOC3021M","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/MOC3021M 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}}