{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MOC3043M","brand":"onsemi","brandSlug":"onsemi","productSlug":"MOC3043M","canonicalUrl":"https://icboms.com/onsemi/MOC3043M","factsUrl":"https://icboms.com/api/mcp/products/MOC3043M","rawCanonicalId":null},"summary":{"shortDescription":"onsemi MOC3043M optoisolator, triac output, 1 channel, 4170 Vrms isolation, 400 V off-state, zero-crossing circuit, 6-DIP through-hole, tube.","salesMarkdown":"## 4170 Vrms isolation and zero-crossing drive The MOC3043M: Rated for 4170 Vrms isolation and 400 V off-state blocking voltage, this optoisolator drives a triac directly from a low-voltage logic signal. The zero-crossing circuit gates the triac on only near the AC mains zero — that cuts inrush and EMI when switching resistive or lightly inductive loads like heaters, lamps, or solenoid valves. The 1 kV/µs minimum static dV/dt means the output triac stays off during fast voltage transients — important when the load is a motor or contactor that kicks back noise onto the line. Without that margin, the triac can self-trigger and the load never turns off. ## LED drive — what the MCU side needs to deliver The LED trigger current (Ift) is 5 mA max, and the forward voltage is 1.25 V typical. The LED can handle up to 60 mA continuous, so there is headroom for derating over temperature or for driving the LED harder to guarantee turn-on at cold start. ## Through-hole 6-DIP — field-swappable, socket-friendly Housed in a standard 0.300-inch 6-DIP through-hole package, the MOC3043M is easy to hand-solder or install in a DIP socket. No reflow profile, no hot-air station — a technician with a soldering iron can swap it on site. The tube packaging keeps the leads aligned for automated insertion too. ## UL and ROHS3 — compliance for mains-connected gear UL recognized and ROHS3 compliant — the approvals cover North American mains isolation and EU lead-free assembly.","metaTitle":"onsemi MOC3043M Optoisolator, Triac Output, 4170 Vrms","metaDescription":"onsemi MOC3043M optoisolator with triac output, 4170 Vrms isolation, 400 V off-state, zero-crossing circuit. Active production, UL approved, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Tube","Output Type":"Triac","Mounting Type":"Through Hole","Package / Case":"6-DIP (0.300\\\", 7.62mm)","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-DIP","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":"$1.04","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.11000","currency":"USD"},{"qty":10,"price":"$0.70500","currency":"USD"},{"qty":100,"price":"$0.52160","currency":"USD"},{"qty":500,"price":"$0.47934","currency":"USD"},{"qty":1000,"price":"$0.39474","currency":"USD"},{"qty":2000,"price":"$0.37501","currency":"USD"},{"qty":5000,"price":"$0.36655","currency":"USD"},{"qty":10000,"price":"$0.35809","currency":"USD"},{"qty":25000,"price":"$0.35378","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional alternative to the MOC3043M?","answer":"The MOC3073M is the closest sibling — same 6-DIP through-hole package, same 4170 Vrms isolation, same 1 kV/µs dV/dt. The key difference: the MOC3073M has no zero-crossing circuit. If your load needs zero-cross switching to limit inrush, the MOC3043M is the correct choice; if non-zero-cross is acceptable, the MOC3073M drops into the same footprint."},{"question":"What compliance documentation does onsemi provide for the MOC3043M?","answer":"The part is UL recognized and ROHS3 compliant. onsemi provides the UL file number and ROHS declaration of compliance through its standard documentation portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/MOC3043M","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/MOC3043M 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}}