{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD817D","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD817D","canonicalUrl":"https://icboms.com/onsemi/FOD817D","factsUrl":"https://icboms.com/api/mcp/products/FOD817D","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD817D single-channel DC-input transistor-output optocoupler, 5000 Vrms isolation, 300-600 % CTR at 5 mA, through-hole 4-DIP (0.300\", 7.62 mm) package, tube.","salesMarkdown":"## Isolation barrier and CTR — the two numbers that decide the BOM fit The FOD817D delivers 5000 Vrms isolation between input and output — this is the peak test voltage the part withstands for one minute per UL 1577, not a working voltage. For reinforced isolation at mains voltages, the working voltage rating must be derated from the peak test figure; a 5000 Vrms test typically supports a 250 Vrms working voltage in pollution degree 2, but the actual system creepage and clearance still govern the safety approval. Current transfer ratio is specified as a range: 300% minimum to 600% maximum at If = 5 mA. This means the output transistor can sink 3 to 6 times the LED current — a 5 mA forward current yields 15 to 30 mA of output drive capability. The wide CTR spread matters for production yield: the design must work at the 300% floor, not the typical value, because the actual CTR of any single unit is unknown until tested. Vce(sat) is 200 mV maximum at the rated output current — this is the voltage dropped across the phototransistor when fully on. In a 5 V logic interface, the 200 mV saturation leaves 4.8 V at the output pin, well above the VIH threshold of most CMOS inputs. For higher-side switching near the 70 V output maximum, the saturation voltage adds to the load voltage drop and must be budgeted in the power dissipation calculation. ## Temperature range and switching speed for industrial control Operating temperature spans -55°C to +110°C, covering industrial enclosures and under-hood automotive zones without derating. The 4 µs rise and 3 µs fall times (typical) set the maximum data rate to roughly 100 kbit/s in a saturated switch application — fast enough for 50/60 Hz line synchronisation, PLC digital inputs, and DC bus voltage feedback, but not for high-speed serial isolation. Forward voltage is 1.2 V typical at If = 20 mA, and the absolute maximum forward current is 50 mA DC. The DC input type means the LED conducts only one polarity — reverse-voltage protection is needed if the drive source can swing negative.","metaTitle":"onsemi FOD817D Optoisolator, 5000Vrms, 300-600% CTR, DIP-4","metaDescription":"onsemi FOD817D single-channel transistor output optocoupler. 5000Vrms isolation, 300-600% CTR at 5mA. Active production, through-hole DIP-4 package.","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)":"600% @ 5mA","Current Transfer Ratio (Min)":"300% @ 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":"$0.5000","stockQuantity":28,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/97f795ec3476128abe24ed3f2e223d6c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the CTR range and why does it matter for my circuit?","answer":"The FOD817D guarantees 300% to 600% current transfer ratio at If = 5 mA. The minimum 300% CTR means the output transistor can sink at least 15 mA with 5 mA LED drive — this sets the worst-case pull-up resistor or relay coil current the optocoupler can switch. Design the output load to draw no more than 15 mA at the minimum CTR to guarantee operation across all units."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD817D","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD817D 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}}