{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"VOS618A-3T","brand":"Vishay","brandSlug":"vishay","productSlug":"VOS618A-3T","canonicalUrl":"https://icboms.com/vishay/VOS618A-3T","factsUrl":"https://icboms.com/api/mcp/products/VOS618A-3T","rawCanonicalId":null},"summary":{"shortDescription":"Vishay VOS618A-3T optoisolator, 3750Vrms isolation, single-channel transistor output, 4-SSOP, 100-200% CTR at 1mA, 80V output, -55 to 110°C.","salesMarkdown":"The VOS618A-3T is a single-channel phototransistor optocoupler from Vishay in a compact 4-SSOP surface-mount package. It provides 3750 Vrms of galvanic isolation between a DC input LED and a phototransistor output, making it a standard choice for breaking ground loops, level-shifting logic signals, and providing safety isolation in industrial controls, power supplies, and PLC I/O modules. ## CTR range — the spec that decides the drive margin The current transfer ratio is specified at 100% minimum and 200% maximum, both measured at a forward current of 1 mA. That bin (VOS618A-3T is the '3' rank) means the output transistor can sink at least as much collector current as the LED forward current, and at most twice it. For a design driving a logic input or a low-side relay, this CTR range gives you a predictable on-state voltage drop — the Vce(sat) is 400 mV max — so you can size the input resistor with confidence. ## Switching speed and output ratings Rise and fall times are 5 µs and 7 µs typical; turn-on and turn-off times run 5 µs and 8 µs. That puts this part in the general-purpose optocoupler class — fine for 10 kHz PWM or 115.2 kbps serial isolation, but not for high-speed gate drives. The output transistor is rated for 80 V collector-emitter and 50 mA continuous current per channel, which covers most 24 V industrial logic and 5 V / 3.3 V level-shifting needs. ## Temperature range and package The operating temperature spans -55°C to 110°C, which covers industrial and some automotive under-hood environments. The 4-SSOP body (4.40 mm width) saves board area compared to the common DIP-4 optocoupler, but the pin spacing is tighter — verify creepage distance against your safety standard if you need reinforced isolation.","metaTitle":"VOS618A-3T Optoisolator, 3750Vrms, Transistor Output, 4-SSOP","metaDescription":"VOS618A-3T optoisolator: 3750Vrms isolation, transistor output, 100-200% CTR at 1mA, 80V output max, -55 to 110°C. Active, ROHS3.","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","Mounting Type":"Surface Mount","Package / Case":"4-SOIC (0.173\\\", 4.40mm Width)","lifecycle_stage":"eol_hot","Number of Channels":"1","Voltage - Isolation":"3750Vrms","Vce Saturation (Max)":"400mV","Operating Temperature":"-55°C ~ 110°C","Rise / Fall Time (Typ)":"5µs, 7µs","Voltage - Output (Max)":"80V","Supplier Device Package":"4-SSOP","Current - Output / Channel":"50mA","Current Transfer Ratio (Max)":"200% @ 1mA","Current Transfer Ratio (Min)":"100% @ 1mA","Voltage - Forward (Vf) (Typ)":"1.1V","Turn On / Turn Off Time (Typ)":"5µs, 8µs","Current - DC Forward (If) (Max)":"50 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.62","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.62000","currency":"USD"},{"qty":10,"price":"$0.38400","currency":"USD"},{"qty":100,"price":"$0.22070","currency":"USD"},{"qty":1000,"price":"$0.17271","currency":"USD"},{"qty":3000,"price":"$0.15832","currency":"USD"},{"qty":6000,"price":"$0.14393","currency":"USD"},{"qty":15000,"price":"$0.13433","currency":"USD"},{"qty":30000,"price":"$0.12953","currency":"USD"},{"qty":75000,"price":"$0.12473","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/9e18ade64f7506aeda7401d719d8a650.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the current transfer ratio (CTR) of VOS618A-3T?","answer":"The CTR is 100% minimum and 200% maximum, both specified at a forward current of 1 mA. That means at 1 mA LED drive, the phototransistor can sink between 1 mA and 2 mA of collector current."},{"question":"Is VOS618A-3T RoHS compliant?","answer":"Yes, it is listed as ROHS3 Compliant."},{"question":"Can VOS618A-3T replace VOS618A-2T or similar opto?","answer":"The VOS618A-3T shares the same 4-SSOP package and pinout as other VOS618A rank variants. The difference is the CTR bin: the '2T' rank typically covers a lower CTR range (63–125% at 1 mA), while the '3T' rank covers 100–200%. A direct swap depends on whether your input drive and output load still meet the minimum CTR requirement with the '3T' bin."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay/VOS618A-3T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay/VOS618A-3T 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}}