{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"VO208AT","brand":"Vishay","brandSlug":"vishay","productSlug":"VO208AT","canonicalUrl":"https://icboms.com/vishay/VO208AT","factsUrl":"https://icboms.com/api/mcp/products/VO208AT","rawCanonicalId":null},"summary":{"shortDescription":"Vishay VO208AT, single-channel optocoupler, DC input, transistor with base output, 4000Vrms isolation, 160-320% CTR at 10mA, 8-SOIC surface-mount package, -40°C to 100°C.","salesMarkdown":"## Package and mounting The Vishay VO208AT is a single-channel optocoupler with a DC input and a phototransistor output that brings out the base pin — handy when you want to bias the transistor for a specific switching threshold or add a speed-up capacitor. The 4000Vrms isolation rating is the headline safety spec: it's enough for basic galvanic isolation in industrial control, PLC I/O modules, and motor-drive feedback paths where the logic side needs to talk to a 24V or 48V field side without a ground loop. The 8-SOIC footprint is standard, so it swaps into existing pads without a layout change. ## CTR spread and Vce(sat) — the design margin numbers Current transfer ratio runs from 160% to 320% at 10mA forward current. That's a 2:1 spread, so if you're driving a logic input that needs a guaranteed high level, you size the input resistor for the minimum CTR — 160% means the output can sink at least 16mA when the LED is driven at 10mA. The 400mV max Vce(sat) at that output current tells you the voltage drop across the transistor when it's fully on; at 50mA output capability per channel, that drop stays under half a volt, which is clean for TTL or 3.3V CMOS logic. Rise and fall times are 3µs and 2µs typical, so the part handles 100 kbps signalling without trouble — fine for status feedback, fault flags, and slow serial links. ## Temperature range and package reality The 8-SOIC body is 3.90mm wide — the narrow version — so double-check your existing SOIC-8 footprint; the wide-body 8-SOIC (7.5mm) won't fit. Surface-mount assembly with standard reflow profiles works; no special baking required if the reel's moisture-barrier bag is intact. The base-pin access makes it a direct fit for designs that need the transistor base brought out — not every SOIC-8 optocoupler gives you that pin.","metaTitle":"VO208AT Optocoupler, 4000Vrms Isolation, 160-320% CTR","metaDescription":"VO208AT optocoupler from Vishay: 4000Vrms isolation, DC input, transistor with base output, 160-320% CTR at 10mA, 8-SOIC surface mount. Active, RoHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Input Type":"DC","Output Type":"Transistor with Base","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Number of Channels":"1","Voltage - Isolation":"4000Vrms","Vce Saturation (Max)":"400mV","Operating Temperature":"-40°C ~ 100°C","Rise / Fall Time (Typ)":"3µs, 2µs","Voltage - Output (Max)":"70V","Supplier Device Package":"8-SOIC","Current - Output / Channel":"50mA","Current Transfer Ratio (Max)":"320% @ 10mA","Current Transfer Ratio (Min)":"160% @ 10mA","Voltage - Forward (Vf) (Typ)":"1.3V","Turn On / Turn Off Time (Typ)":"3µs, 3µs","Current - DC Forward (If) (Max)":"60 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.67","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.67000","currency":"USD"},{"qty":10,"price":"$0.43900","currency":"USD"},{"qty":100,"price":"$0.28780","currency":"USD"},{"qty":1000,"price":"$0.22725","currency":"USD"},{"qty":2000,"price":"$0.21210","currency":"USD"},{"qty":6000,"price":"$0.20453","currency":"USD"},{"qty":10000,"price":"$0.20150","currency":"USD"},{"qty":50000,"price":"$0.18938","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/5d994889cd9853e5bb7421b501f63e98.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the VO208AT CTR range and Vce sat?","answer":"The current transfer ratio is 160% minimum and 320% maximum, both measured at 10mA forward current. The output transistor saturation voltage is 400mV maximum. These two numbers define the on-state drive strength and the voltage drop across the output."},{"question":"What is the VO208AT optocoupler used for?","answer":"It is a general-purpose galvanic isolation optocoupler for industrial control, PLC I/O, motor-drive feedback, and any application where a DC logic signal needs to cross an isolation barrier at speeds up to about 100 kbps. The base-pin output lets you tailor the switching threshold or add external compensation."},{"question":"Is the VO208AT RoHS compliant?","answer":"Yes, it is RoHS3 compliant per the Vishay listing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay/VO208AT","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay/VO208AT when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}