{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD817B","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD817B","canonicalUrl":"https://icboms.com/onsemi/FOD817B","factsUrl":"https://icboms.com/api/mcp/products/FOD817B","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD817B, single-channel DC-input transistor-output optocoupler, 4-DIP through-hole package, 5000Vrms isolation, 130%–260% CTR at 5 mA, -55°C to 110°C operating range.","salesMarkdown":"## Why the isolation rating matters for your barrier design The FOD817B delivers 5000Vrms isolation in a 4-DIP through-hole package — that is the figure that decides whether it meets reinforced-insulation creepage for a 240 VAC motor-drive barrier or a flyback supply feedback loop. DC input only, transistor output, single channel. The 70 V max collector-emitter voltage and 50 mA continuous output current handle the logic-level side of the isolation gap. ## CTR bin B — the gain window that sets the LED drive The FOD817B is binned for a current transfer ratio of 130% to 260% at 5 mA forward current. That middle gain band means the designer can set the LED forward current between roughly 2 mA and 8 mA and still guarantee the output transistor saturates below 200 mV. Compared to the FOD817A (80%–160% CTR) and the FOD817C (200%–400% CTR), the B bin is the most commonly specified for general-purpose isolated feedback and signal coupling — it gives enough headroom for LED aging without overdriving the phototransistor base. ## Active production — no end-of-life clock ticking No LTB notice, no successor announced. ROHS3 compliant. The 4-DIP (0.300\", 7.62mm) footprint is a standard through-hole layout — no special reflow profile, no moisture sensitivity level to track. ## Switching speed and output saturation — what the numbers mean That limits the useful switching frequency to roughly 50–100 kHz for isolated gate drive or signal coupling — fast enough for a 50/60 Hz mains-isolated feedback loop or a low-speed PLC input, but not for a high-frequency SMPS loop. Maximum Vce saturation is 200 mV at the rated output current.","metaTitle":"FOD817B onsemi Optoisolator 5000Vrms Transistor Output 4-DIP","metaDescription":"FOD817B onsemi optocoupler: 5000Vrms isolation, DC input, transistor output, 130%–260% CTR at 5 mA, -55°C to 110°C, 4-DIP through-hole.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","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)":"260% @ 5mA","Current Transfer Ratio (Min)":"130% @ 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":"$0.4300","priceTiers":[{"qty":1,"price":"$0.43000","currency":"USD"},{"qty":10,"price":"$0.26400","currency":"USD"},{"qty":100,"price":"$0.15190","currency":"USD"},{"qty":1000,"price":"$0.11890","currency":"USD"},{"qty":2000,"price":"$0.10899","currency":"USD"},{"qty":5000,"price":"$0.09908","currency":"USD"},{"qty":10000,"price":"$0.09248","currency":"USD"},{"qty":25000,"price":"$0.08917","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/97f795ec3476128abe24ed3f2e223d6c.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/FOD817B/alternatives.json"},"ai":{"faq":[{"question":"How can I order FOD817B or check availability?","answer":"FOD817B is an active-production part from onsemi. We source it to order against your BOM quantity — submit an RFQ for current pricing and lead time. No stock-holding claim; availability confirmed at quote."},{"question":"Can FOD817B replace PC817?","answer":"The PC817 is a similar single-channel DC-input transistor-output optocoupler in a 4-DIP package. The FOD817B's CTR bin (130%–260% at 5 mA) overlaps the typical PC817 gain range, so it is often a functional cross. Confirm the pinout matches your layout — both use the standard DIP-4 pin 1 anode, pin 2 cathode, pin 3 emitter, pin 4 collector arrangement."},{"question":"Is FOD817B RoHS compliant?","answer":"Yes, the FOD817B is listed as ROHS3 Compliant."},{"question":"Can FOD817B be used for AC input?","answer":"No, the FOD817B is specified for DC input only. The LED is a single polarity device — applying reverse voltage beyond the 6 V reverse breakdown will damage it. For AC input, use an optocoupler with back-to-back LEDs or a bridge rectifier on the input side."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD817B","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD817B when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}