{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD817DW","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD817DW","canonicalUrl":"https://icboms.com/onsemi/FOD817DW","factsUrl":"https://icboms.com/api/mcp/products/FOD817DW","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD817DW optoisolator, single-channel, DC input, transistor output, 5000Vrms isolation, 300-600% CTR, 4-DIP through-hole package, Box.","salesMarkdown":"## Isolation barrier and CTR — the two numbers that decide fit The FOD817DW is a single-channel optocoupler from onsemi's FOD817 family, with a DC-input LED and a phototransistor output. Its 5000Vrms isolation rating qualifies it for reinforced insulation in mains-connected circuits — think AC-DC power supplies, motor drive feedback, or PLC digital inputs where the logic side must be galvanically separated from the field side. The current transfer ratio (CTR) is specified at 300% minimum and 600% maximum, both measured at If=5mA. That wide band means the output transistor can saturate with as little as 1.7 mA input current (at 300% CTR) — useful when the driving logic has limited drive strength. The 200mV Vce(sat) ceiling keeps the voltage drop across the output low, so the downstream gate or logic input sees a clean logic-low. Rise and fall times are 4µs and 3µs typical, respectively. That puts the usable switching frequency around 50 kHz or below — fine for 50/60 Hz line synchronization, relay drivers, or status feedback, but not for high-speed data isolation. The 4-DIP footprint is shared across many optocouplers, so a PCB layout designed for a Broadcom or Toshiba part in the same outline accepts this onsemi device without a board spin. Operating temperature spans -55°C to 110°C — the full industrial/military range. That covers cold-start in outdoor cabinets and the self-heating inside a sealed power supply without derating. Maximum forward current is 50 mA DC, and the output transistor can sink 50 mA continuous at up to 70 V. The 1.2V forward voltage (typical) at If=5mA is consistent with standard IR LEDs. ## Lifecycle reality — obsolete, but sourced Because the 4-DIP footprint and transistor-output topology are common, a functionally equivalent optocoupler from another manufacturer (e.g., Broadcom, Toshiba, or Lite-On) with matching CTR range and isolation voltage can serve as a second source — but pin compatibility must be verified against the specific datasheet.","metaTitle":"onsemi FOD817DW Optoisolator, 5000Vrms, 300-600% CTR, 4-DIP","metaDescription":"onsemi FOD817DW single-channel transistor output optocoupler, 5000Vrms isolation, 300-600% CTR at 5mA, 4-DIP package. Obsolete — sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Optoisolators"],"specifications":{"Mfr":"onsemi","Series":"-","Package":"Box","Input Type":"DC","Output Type":"Transistor","Mounting Type":"Through Hole","Package / Case":"4-DIP (0.400\\\", 10.16mm)","Product Status":"Obsolete","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":"$0.5200","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/97f795ec3476128abe24ed3f2e223d6c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the CTR range and what does it mean for my design?","answer":"The current transfer ratio is 300% minimum to 600% maximum at If=5mA. A 300% CTR means the output transistor can sink 3× the input current — so a 5mA input can drive 15mA into the load. The wide min-to-max spread accounts for manufacturing tolerance and temperature drift; design the load current budget around the minimum CTR, not the typical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD817DW","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD817DW when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T06:33:01.388Z","lastPublished":"2026-07-21T06:33:01.388Z","indexable":true}}