{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD817A300","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD817A300","canonicalUrl":"https://icboms.com/onsemi/FOD817A300","factsUrl":"https://icboms.com/api/mcp/products/FOD817A300","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD817A300 single-channel transistor-output optocoupler, DC input, 5000Vrms isolation, 80-160% CTR, 4-DIP through-hole package, -55 to 110°C operating range.","salesMarkdown":"## 5000Vrms isolation in a 4-DIP through-hole package The onsemi FOD817A300 is a single-channel transistor-output optocoupler in the standard 4-DIP (0.300\", 7.62mm) through-hole package. It provides 5000Vrms galvanic isolation between a DC input LED and a phototransistor output, making it a fit for isolating low-voltage control logic from higher-voltage power circuits or for breaking ground loops in industrial sensor interfaces. ## CTR range and switching speed define the drive margin Current transfer ratio (CTR) is specified at 80% minimum and 160% maximum when the LED is driven at 5mA. This band tells the designer how much output current the phototransistor can sink relative to the input drive — a 5mA LED current guarantees at least 4mA of output drive capability at the collector, which is sufficient to pull a standard TTL or CMOS logic input low through a pull-up resistor. The 4µs rise and 3µs fall times (typical) set the practical switching ceiling around 100 kHz for a resistive load; above that, the output waveform rounds off and the downstream logic may miss edges. ## Output ratings and temperature range The phototransistor is rated for 70V collector-emitter voltage and 50mA continuous output current, with a saturation voltage of 200mV maximum at the rated current.","metaTitle":"onsemi FOD817A300 Optoisolator, 5000Vrms, 4-DIP, DC Input","metaDescription":"onsemi FOD817A300 single-channel transistor output optocoupler. 5000Vrms isolation, 80-160% CTR at 5mA, -55 to 110°C. Active production, through-hole 4-DIP.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Mfr":"onsemi","Series":"-","Package":"Tube","Input Type":"DC","Output Type":"Transistor","Mounting Type":"Through Hole","Package / Case":"4-DIP (0.300\\\", 7.62mm)","Product Status":"Active","lifecycle_stage":"eol_hot","Number of Channels":"1","Base Product Number":"FOD817","Voltage - Isolation":"5000Vrms","Vce Saturation (Max)":"200mV","Operating Temperature":"-55°C ~ 110°C","Rise / Fall Time (Typ)":"4µs, 3µs","Voltage - Output (Max)":"70V","Supplier Device Package":"4-DIP","Current - Output / Channel":"50mA","Current Transfer Ratio (Max)":"160% @ 5mA","Current Transfer Ratio (Min)":"80% @ 5mA","Voltage - Forward (Vf) (Typ)":"1.2V","Turn On / Turn Off Time (Typ)":"-","Current - DC Forward (If) (Max)":"50 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4200","stockQuantity":19,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/97f795ec3476128abe24ed3f2e223d6c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the FOD817A300's current transfer ratio (CTR) range?","answer":"The CTR is specified at 80% minimum and 160% maximum when the LED forward current is 5mA. This means at 5mA input, the output transistor can sink between 4mA and 8mA at the collector."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD817A300","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD817A300 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}}