{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"FOD817A3S","brand":"onsemi","brandSlug":"onsemi","productSlug":"FOD817A3S","canonicalUrl":"https://icboms.com/onsemi/FOD817A3S","factsUrl":"https://icboms.com/api/mcp/products/FOD817A3S","rawCanonicalId":null},"summary":{"shortDescription":"onsemi FOD817A3S, single-channel DC-input transistor-output optoisolator, 5000Vrms isolation, 80%–160% CTR at 5 mA, in a 4-SMD Gull Wing surface-mount package.","salesMarkdown":"The FOD817A3S is a single-channel optoisolator from onsemi with a DC-input LED driving a phototransistor output, rated for 5000Vrms isolation between primary and secondary sides. It comes in a 4-SMD Gull Wing package (surface-mount, tube delivery) — the same footprint as the through-hole DIP-4 but reflow-ready for automated assembly. Current transfer ratio is guaranteed between 80% and 160% at a forward current of 5 mA — that means with 5 mA through the LED, the output transistor can sink at least 4 mA and at most 8 mA. The 80% min CTR gives you headroom to drop the LED current below 5 mA if your MCU pin is limited, but you lose margin on the output side — check the load current against the 50 mA absolute max output. Typical Vce saturation is 200 mV max — the transistor pulls close to ground, so you can drive a logic input directly without a pull-up resistor on the collector. The base product number is FOD817, which covers a family of CTR-binned and package variants — the A3S suffix specifies the 80-160% CTR bin in the SMD Gull Wing package.","metaTitle":"FOD817A3S onsemi Optoisolator 5000Vrms Transistor Output","metaDescription":"onsemi FOD817A3S: DC input, transistor output, 5000Vrms isolation, 80-160% CTR at 5mA, -55°C to 110°C, 4-SMD Gull Wing. Active lifecycle.","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":"Surface Mount","Package / Case":"4-SMD, Gull Wing","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-SMD","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":"$0.4500","priceTiers":[{"qty":1,"price":"$0.45000","currency":"USD"},{"qty":10,"price":"$0.27400","currency":"USD"},{"qty":100,"price":"$0.15770","currency":"USD"},{"qty":1000,"price":"$0.12344","currency":"USD"},{"qty":2000,"price":"$0.11316","currency":"USD"},{"qty":5000,"price":"$0.10287","currency":"USD"},{"qty":10000,"price":"$0.09601","currency":"USD"},{"qty":25000,"price":"$0.09258","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/97f795ec3476128abe24ed3f2e223d6c.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/FOD817A3S/alternatives.json"},"ai":{"faq":[{"question":"Does FOD817A3S replace the through-hole FOD817A?","answer":"Electrically it is the same CTR bin (80-160% at 5 mA) and same isolation rating, but the package differs: FOD817A3S is surface-mount Gull Wing, while FOD817A is through-hole DIP-4. The pinout is identical — just the footprint changes."},{"question":"Where can I buy FOD817A3S and how do I get a price?","answer":"Submit an RFQ with your target quantity — we source to order and confirm current pricing and lead time at quote."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/FOD817A3S","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/FOD817A3S 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}}