{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD4208V","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD4208V","canonicalUrl":"https://icboms.com/onsemi/FOD4208V","factsUrl":"https://icboms.com/api/mcp/products/FOD4208V","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD4208V, single-channel optoisolator with triac output, 5000Vrms isolation, 800V off-state voltage, 60µs turn-on time, through-hole 6-DIP package","salesMarkdown":"## 5000Vrms isolation for line-voltage switching The FOD4208V is a single-channel optoisolator from onsemi with a triac output, rated for 5000Vrms isolation and 800V off-state voltage. This combination makes it suitable for switching 240V AC loads in industrial motor drives, HVAC contactors, and solid-state relay applications where galvanic isolation between the low-voltage control side and the high-voltage load side is mandatory. With a static dV/dt of 10kV/µs minimum, the output triac resists false turn-on from fast voltage transients — a common failure mode when switching inductive loads such as motors or solenoids. The non-zero-crossing output enables phase-angle control for dimming or soft-start, unlike zero-crossing optotriacs that only trigger at the AC zero point. ## Trigger current and thermal margin The LED trigger current (Ift) is 2mA maximum, which is low enough to be driven directly from a 3.3V or 5V GPIO through a series resistor. Forward voltage is 1.28V typical at If=30mA, so the control-side power budget stays modest even in multi-channel designs. The 500µA hold current means the triac stays latched once triggered until the load current drops below that threshold — relevant for minimum-load scenarios like small fans or LED lamps that might not draw enough current to keep the triac conducting. ## Active production, through-hole package It is in a 6-DIP through-hole package, which is a standard footprint for optoisolators and easy to hand-assemble or wave-solder. The supplier device package is 6-DIP. Approvals include cUL, FIMKO, UL, and VDE, which streamlines safety certification for end equipment sold into North American and European markets. ROHS3 compliance is confirmed.","metaTitle":"FOD4208V onsemi Optoisolator Triac Output 5000Vrms 6-DIP","metaDescription":"FOD4208V onsemi optoisolator with triac output, 5000Vrms isolation, 800V off-state voltage, 10kV/µs dV/dt. Active lifecycle. Through-hole 6-DIP package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Bulk","Output Type":"Triac","Turn On Time":"60µs","Mounting Type":"Through Hole","Package / Case":"6-DIP (0.300\\\", 7.62mm)","Approval Agency":"cUL, FIMKO, 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":"No","Supplier Device Package":"6-DIP","Voltage - Forward (Vf) (Typ)":"1.28V","Current - DC Forward (If) (Max)":"30 mA","Current - LED Trigger (Ift) (Max)":"2mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.2","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$4.20000","currency":"USD"},{"qty":10,"price":"$2.96900","currency":"USD"},{"qty":100,"price":"$2.43210","currency":"USD"},{"qty":500,"price":"$2.05030","currency":"USD"},{"qty":1000,"price":"$1.88062","currency":"USD"},{"qty":2000,"price":"$1.80285","currency":"USD"},{"qty":5000,"price":"$1.76750","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/4508d0a74baa9082fd3b0c6c58d4edcd.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is FOD4208V zero crossing or random phase?","answer":"The FOD4208V is a random-phase (non-zero-crossing) optotriac. It triggers the triac output immediately when the LED current exceeds the 2mA Ift threshold, regardless of the AC line voltage phase. This is the correct choice for phase-angle dimming or soft-start circuits; for simple on/off switching with reduced EMI, use a zero-crossing variant like the FOD4218."},{"question":"Can FOD4208V switch 240V AC loads?","answer":"Yes. The off-state voltage rating of 800V provides ample margin above the 240V RMS line (peak ~340V). The 5000Vrms isolation satisfies reinforced insulation requirements per UL and VDE. Ensure the load current exceeds the 500µA hold current to keep the triac latched; very low-power loads may need a snubber or a minimum load resistor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD4208V","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD4208V when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}