{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD4218SD","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD4218SD","canonicalUrl":"https://icboms.com/onsemi/FOD4218SD","factsUrl":"https://icboms.com/api/mcp/products/FOD4218SD","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD4218SD optoisolator, triac output, 1 channel, 5000Vrms isolation, 800V off-state, 10kV/µs dV/dt, 6-SMD gull wing, surface mount, tape and reel.","salesMarkdown":"## Triac-output optoisolator for AC load switching The onsemi FOD4218SD is a 1-channel optoisolator with a triac output, designed to drive AC loads like solenoids, valves, and small motors from a low-voltage control side. Rated for 5000Vrms isolation between input and output, it provides galvanic separation for safety in equipment that must meet UL, cUL, and FIMKO standards. The 800 V off-state voltage rating means it can directly switch 240 VAC or 277 VAC lines with margin, and the 10 kV/µs minimum static dV/dt ensures it won't falsely trigger on fast mains transients or relay contact bounce. With no zero-crossing circuit (random-phase triac driver), the FOD4218SD fires the triac at any point in the AC cycle — useful for phase-angle dimming or soft-start, but it generates more EMI than a zero-crossing part. The 60 µs turn-on time is fast enough for 50/60 Hz line switching; the 500 µA hold current (Ih) means the output triac stays latched once triggered until the load current drops below that threshold near the zero crossing. Operating from -55°C to 100°C, this optoisolator suits industrial enclosures, outdoor telecom cabinets, and motor-drive environments where the ambient temperature near the power stage runs hot. The 1.28 V typical forward voltage (Vf) at 30 mA max DC forward current (If) means the LED side drops about 1.3 V; a series resistor from the logic supply sets the drive current. Fully ROHS3 compliant, with no restricted substances above the threshold; the part also holds cUL, FIMKO, and UL safety agency approvals, covering North American and European regulatory acceptance.","metaTitle":"onsemi FOD4218SD Optoisolator, Triac Output, 5kVrms, 800V","metaDescription":"onsemi FOD4218SD optoisolator with triac output, 5000Vrms isolation, 800V off-state, 10kV/µs dV/dt. Active, ROHS3. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Output Type":"Triac","Turn On Time":"60µs","Mounting Type":"Surface Mount","Package / Case":"6-SMD, Gull Wing","Approval Agency":"cUL, FIMKO, UL","lifecycle_stage":"eol_hot","Number of Channels":"1","Static dV/dt (Min)":"10kV/µs","Current - Hold (Ih)":"500µA","Voltage - Isolation":"5000Vrms","Voltage - Off State":"800 V","Operating Temperature":"-55°C ~ 100°C","Zero Crossing Circuit":"No","Supplier Device Package":"6-SMD","Voltage - Forward (Vf) (Typ)":"1.28V","Current - DC Forward (If) (Max)":"30 mA","Current - LED Trigger (Ift) (Max)":"1.3mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.84","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$5.84000","currency":"USD"},{"qty":10,"price":"$4.12700","currency":"USD"},{"qty":100,"price":"$3.38040","currency":"USD"},{"qty":500,"price":"$2.84978","currency":"USD"},{"qty":1000,"price":"$2.61393","currency":"USD"},{"qty":2000,"price":"$2.50584","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/4508d0a74baa9082fd3b0c6c58d4edcd.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD4218SD","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD4218SD 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}}