{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD814A3SD","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD814A3SD","canonicalUrl":"https://icboms.com/onsemi/FOD814A3SD","factsUrl":"https://icboms.com/api/mcp/products/FOD814A3SD","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD814A3SD, single-channel optoisolator, 5000Vrms isolation, AC/DC input, transistor output, 50-150% CTR at 1mA, surface-mount 4-SMD gull wing package.","salesMarkdown":"## Isolation barrier and input flexibility The FOD814A3SD is a single-channel optoisolator from onsemi that accepts both AC and DC input, eliminating the need for a separate bridge rectifier when sensing AC mains zero-cross or line presence. The output is a phototransistor rated for 70V maximum collector-emitter voltage and 50mA continuous current per channel. Reinforced isolation of 5000Vrms supports safety barrier compliance for industrial controls, power-supply feedback loops, and PLC I/O modules where galvanic separation between high-voltage and low-voltage domains is mandatory. ## CTR window and switching speed Current transfer ratio is specified from 50% minimum to 150% maximum at a forward current of 1mA. This narrow CTR window reduces gain variation across reels compared to wider-bin parts, which simplifies feedback-loop compensation in isolated power supplies. Typical rise and fall times of 4µs and 3µs respectively are adequate for 50/60 Hz line-frequency sensing and low-speed digital isolation up to about 10 kbps. For faster serial interfaces like I²C or SPI, a logic-output optocoupler with higher data rate is needed. ## Package and temperature range Housed in a 4-SMD gull-wing package with a 4-SMD supplier device package designation. The gull-wing leads provide visual solder-joint inspection access and are compatible with standard reflow profiles for lead-free assembly. Rated for operation from -55°C to 105°C, covering most industrial and telecom enclosure environments. Not qualified to AEC-Q100 — for under-hood or chassis-mounted automotive applications, consider an AEC-grade optocoupler. ## Sourcing and compliance status No stock-holding claim is made; the part is sourced to order through our supply network.","metaTitle":"FOD814A3SD onsemi Optoisolator 5kV AC/DC Transistor Output","metaDescription":"onsemi FOD814A3SD optoisolator: 5000Vrms isolation, AC/DC input, transistor output, 50-150% CTR at 1mA, -55°C to 105°C, 4-SMD gull wing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Input Type":"AC, DC","Output Type":"Transistor","Mounting Type":"Surface Mount","Package / Case":"4-SMD, Gull Wing","lifecycle_stage":"eol_hot","Number of Channels":"1","Voltage - Isolation":"5000Vrms","Vce Saturation (Max)":"200mV","Operating Temperature":"-55°C ~ 105°C","Rise / Fall Time (Typ)":"4µs, 3µs","Voltage - Output (Max)":"70V","Supplier Device Package":"4-SMD","Current - Output / Channel":"50mA","Current Transfer Ratio (Max)":"150% @ 1mA","Current Transfer Ratio (Min)":"50% @ 1mA","Voltage - Forward (Vf) (Typ)":"1.2V","Current - DC Forward (If) (Max)":"50 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.79","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.82000","currency":"USD"},{"qty":10,"price":"$0.53700","currency":"USD"},{"qty":100,"price":"$0.35180","currency":"USD"},{"qty":1000,"price":"$0.27777","currency":"USD"},{"qty":2000,"price":"$0.25926","currency":"USD"},{"qty":5000,"price":"$0.25000","currency":"USD"},{"qty":10000,"price":"$0.24629","currency":"USD"},{"qty":25000,"price":"$0.24074","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/97f795ec3476128abe24ed3f2e223d6c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does the FOD814A3SD work with DC input?","answer":"Yes — the input stage accepts both AC and DC. For DC logic-level input, drive the LED with a series resistor to limit forward current to 50mA max. Typical forward voltage is 1.2V."},{"question":"What is the closest functional alternative to the FOD814A3SD?","answer":"The FOD817 series (e.g. FOD817ASD, FOD817B3SD, FOD817DSD) is a near match — same 5000Vrms isolation, transistor output, and 4-SMD gull-wing package. The key difference is input type: FOD817 is DC-input only, while the FOD814A3SD accepts both AC and DC. If your design uses only DC drive, the FOD817 series is a drop-in alternative with a slightly narrower operating temperature range (-55°C to 110°C vs 105°C)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD814A3SD","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD814A3SD 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}}