{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD814AS","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD814AS","canonicalUrl":"https://icboms.com/onsemi/FOD814AS","factsUrl":"https://icboms.com/api/mcp/products/FOD814AS","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD814AS, 1-channel optoisolator, transistor output, 5000Vrms isolation, AC/DC input, 4-SMD Gull Wing package, -55°C to 105°C.","salesMarkdown":"## What this optoisolator is and where it fits The FOD814AS is a 1-channel optoisolator from onsemi with a transistor output and a 5000Vrms isolation rating. It accepts both AC and DC input, which means a single part can handle line-voltage zero-cross detection or a logic-level signal from a microcontroller. The 4-SMD Gull Wing package suits surface-mount assembly, and the operating temperature range of -55°C to 105°C covers industrial and outdoor equipment where the PCB sees thermal cycling. ## Key ratings and what they mean for your BOM The 5000Vrms isolation voltage is the headline spec for safety-rated designs — it meets the reinforced insulation requirement in many industrial and medical power supplies without needing a second opto in series. Current transfer ratio (CTR) is specified at 50% to 150% at 1 mA forward current. That range tells you the output transistor can sink enough current to drive a logic gate or a low-power relay directly, but you should design the pull-up resistor for the minimum CTR to guarantee switching at low input current. The transistor output is rated for 70 V and 50 mA continuous. That is enough for 24 V PLC inputs, 5 V logic level shifting, or driving a small DC load, but not for a power relay coil without a buffer transistor. Rise and fall times are 4 µs and 3 µs typical. That limits the switching frequency to about 100 kHz for clean edges — fine for 50/60 Hz line sensing or low-speed data isolation, but not for high-speed serial buses. ## Lifecycle and sourcing reality The FOD814AS is listed as Active and ROHS3 compliant. The 4-SMD Gull Wing package is a standard footprint shared with many optoisolators, so the reel can be stored in a dry cabinet with the rest of the SMD inventory. No stock-holding claim — sourced per RFQ.","metaTitle":"FOD814AS Optoisolator 5000Vrms Transistor Output onsemi","metaDescription":"onsemi FOD814AS optoisolator: 5000Vrms isolation, transistor output, AC/DC input, 4-SMD Gull Wing. Active, ROHS3 compliant. Sourced per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Tube","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":"$0.63","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.63000","currency":"USD"},{"qty":10,"price":"$0.41200","currency":"USD"},{"qty":100,"price":"$0.27230","currency":"USD"},{"qty":1000,"price":"$0.21025","currency":"USD"},{"qty":2000,"price":"$0.18998","currency":"USD"},{"qty":5000,"price":"$0.17732","currency":"USD"},{"qty":10000,"price":"$0.17098","currency":"USD"},{"qty":25000,"price":"$0.16845","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/97f795ec3476128abe24ed3f2e223d6c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"How can I order FOD814AS or check stock?","answer":"The FOD814AS is an active onsemi part. Submit an RFQ with your target quantity and lead-time window; availability and pricing are confirmed at quote time."},{"question":"What is the closest pin-compatible alternative to FOD814AS?","answer":"The FOD814AS shares its 4-SMD Gull Wing footprint and transistor output with many onsemi optoisolators. A direct cross-shop candidate is the FOD817 series — same package, similar CTR range, but check the isolation voltage rating for your specific safety standard."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD814AS","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD814AS when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T20:08:53.249Z","lastPublished":"2026-07-17T20:08:53.249Z","indexable":true}}