{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD4108SDV","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD4108SDV","canonicalUrl":"https://icboms.com/onsemi/FOD4108SDV","factsUrl":"https://icboms.com/api/mcp/products/FOD4108SDV","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD4108SDV optoisolator, Triac output, 1-channel, 800 V off-state, 5000 Vrms isolation, zero-crossing circuit, 6-SMD Gull Wing, surface mount.","salesMarkdown":"## 800 V off-state with zero-crossing — clean AC switching The FOD4108SDV is a 1-channel optoisolator with a Triac output rated for 800 V off-state voltage and a built-in zero-crossing circuit. This means the internal Triac only fires when the AC mains voltage is near zero, minimising inrush current and EMI when switching resistive or lightly inductive loads like heaters, solenoids, or small motors. With 5000 Vrms isolation between the LED input and the Triac output, it provides a galvanic safety barrier between a low-voltage logic side (microcontroller, PLC) and a 240 V or 480 V AC power circuit. The 10 kV/µs minimum static dV/dt rating means the output won't falsely trigger from fast voltage transients — important when switching inductive loads like contactors or relays where back-EMF spikes are common. ## Low trigger current — drives directly from logic outputs The LED requires a maximum trigger current of 2 mA (Ift) to turn on the Triac, and the forward voltage is a typical 1.25 V. The maximum continuous forward current is 30 mA, giving plenty of headroom for derating. Once triggered, the Triac holds conduction until the load current drops below the 500 µA hold current (Ih) — typically at the next AC zero-crossing. The 60 µs turn-on time is fast enough for 50/60 Hz line-frequency switching; the zero-crossing circuit adds a small delay waiting for the next zero point, but that's the trade-off for clean switching. ## Package and board-fit — hand-solderable Gull Wing The FOD4108SDV comes in a 6-SMD Gull Wing package (6-SMD, Gull Wing) with a supplier device package of 6-SMD. The Gull Wing leads are visible and accessible — easy to hand-solder with a fine-tip iron or inspect under a microscope, unlike a QFN or BGA. The 1.27 mm (0.05-inch) lead pitch is standard for this class of optoisolator and matches common PCB footprints. Surface mount mounting type means it sits flat on the board — no through-hole leads to trim or solder on the back side.","metaTitle":"onsemi FOD4108SDV Optoisolator, Triac Output, 800 V, 5 kV","metaDescription":"onsemi FOD4108SDV optoisolator with Triac output, 800 V off-state, 5000 Vrms isolation, zero-crossing circuit. Active lifecycle, UL/CSA/VDE approved.","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":"CSA, UL, VDE","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":"Yes","Supplier Device Package":"6-SMD","Voltage - Forward (Vf) (Typ)":"1.25V","Current - DC Forward (If) (Max)":"30 mA","Current - LED Trigger (Ift) (Max)":"2mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.99","stockQuantity":23,"priceTiers":[{"qty":1,"price":"$3.99000","currency":"USD"},{"qty":10,"price":"$2.81800","currency":"USD"},{"qty":100,"price":"$2.30790","currency":"USD"},{"qty":500,"price":"$1.94558","currency":"USD"},{"qty":1000,"price":"$1.78457","currency":"USD"},{"qty":2000,"price":"$1.71078","currency":"USD"},{"qty":5000,"price":"$1.67723","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/49cf8eca9dd44957a150c4b466b221d4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is FOD4108SDV's listed output type?","answer":"The output type is Triac, with a zero-crossing circuit. It switches AC loads up to 800 V off-state and is driven by a low-current LED input."},{"question":"What compliance documentation does onsemi provide for FOD4108SDV?","answer":"The FOD4108SDV is ROHS3 Compliant and carries CSA, UL, and VDE safety approvals. onsemi provides the standard compliance documentation including the RoHS declaration and agency certification letters."},{"question":"Will FOD4108SDV drop into a board designed for MOC3073SVM?","answer":"The FOD4108SDV has a different pinout and package footprint than the MOC3073SVM. The MOC3073SVM is a through-hole or different SMD variant with 4170 Vrms isolation and no zero-crossing circuit. A board spin or adapter is required — they are not drop-in replacements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD4108SDV","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD4108SDV 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}}