{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"VOM618A-3T","brand":"Vishay","brandSlug":"vishay","productSlug":"VOM618A-3T","canonicalUrl":"https://icboms.com/vishay/VOM618A-3T","factsUrl":"https://icboms.com/api/mcp/products/VOM618A-3T","rawCanonicalId":null},"summary":{"shortDescription":"Vishay VOM618A-3T optoisolator, 1-channel DC input, transistor output, 3750 Vrms isolation, 100%–200% CTR at 1 mA, 4-SMD Gull Wing package, -55°C to 110°C, surface mount.","salesMarkdown":"## What this optoisolator brings to the board The Vishay VOM618A-3T is a single-channel DC-input optocoupler with a phototransistor output, rated for 3750 Vrms isolation between primary and secondary sides. The current transfer ratio (CTR) is specified at 100% minimum and 200% maximum when you drive the LED at 1 mA forward current, which means even a weak 3.3 V logic signal through a series resistor can saturate the output transistor. The 80 V output voltage ceiling and 50 mA per-channel current give you headroom for driving relays, PLC inputs, or level-shifting industrial logic lines. ## CTR and 3.3 V logic — will it switch cleanly? Yes, the VOM618A-3T works with 3.3 V logic. The LED forward voltage is typically 1.1 V, so a 3.3 V output through a 220 Ω to 470 Ω resistor lands near 1 mA forward current. At that drive level the CTR is guaranteed between 100% and 200%, so the output transistor can sink the load current without hanging in the linear region. The turn-on time is 7 µs typical, turn-off 6 µs — fast enough for most 10 kHz to 50 kHz switching applications like inverter gate drives or sensor readback. ## Where it fits — temperature and environment Rated from -55°C to 110°C operating temperature, this part handles cold-start in outdoor enclosures and the heat inside a motor control cabinet. The 3750 Vrms isolation is suited for reinforced insulation in industrial AC mains circuits (up to 300 V working voltage typically), and the 4-SOP package gives you 8 mm creepage distance between input and output pins — enough for basic safety isolation in many designs. ## Lifecycle and compliance No last-time-buy or successor has been announced.","metaTitle":"VOM618A-3T Optoisolator, 3750Vrms, 100-200% CTR, 4-SOP","metaDescription":"VOM618A-3T optoisolator from Vishay: 3750Vrms isolation, transistor output, 100-200% CTR at 1mA, -55°C to 110°C, 4-SOP Gull Wing. 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","Mounting Type":"Surface Mount","Package / Case":"4-SMD, Gull Wing","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, 4µs","Voltage - Output (Max)":"80V","Supplier Device Package":"4-SOP","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)":"7µs, 6µs","Current - DC Forward (If) (Max)":"60 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.56","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.56000","currency":"USD"},{"qty":10,"price":"$0.34600","currency":"USD"},{"qty":100,"price":"$0.19880","currency":"USD"},{"qty":1000,"price":"$0.15560","currency":"USD"},{"qty":3000,"price":"$0.14264","currency":"USD"},{"qty":6000,"price":"$0.12967","currency":"USD"},{"qty":15000,"price":"$0.12102","currency":"USD"},{"qty":30000,"price":"$0.11670","currency":"USD"},{"qty":75000,"price":"$0.11238","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/00224e4ad862aa4eb7a8b09ab8ff00dd.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the current transfer ratio (CTR) of VOM618A-3T?","answer":"The CTR is 100% minimum and 200% maximum, measured at 1 mA forward current. This means with 1 mA through the LED, the output transistor can sink at least 1 mA and at most 2 mA of collector current — enough to drive a logic input or a small relay coil directly."},{"question":"Is VOM618A-3T compatible with 3.3V logic?","answer":"Yes. The LED forward voltage is typically 1.1 V, so a 3.3 V logic output with a series resistor in the 220 Ω to 470 Ω range sets the forward current near 1 mA. The CTR at that level is 100% to 200%, so the output transistor saturates cleanly and switches within 7 µs on and 6 µs off."},{"question":"Can VOM618A-3T replace 4N35?","answer":"The VOM618A-3T is not a direct pin-for-pin replacement for the 4N35 — the 4N35 is a 6-pin DIP package, while the VOM618A-3T is a 4-pin SOP Gull Wing. However, both are single-channel transistor-output optocouplers with similar CTR ranges and 3750 Vrms isolation. If your board layout can accommodate the smaller 4-SOP footprint and you adjust the LED drive resistor for the 1 mA test condition, it can serve as a functional substitute in many designs."},{"question":"Is VOM618A-3T RoHS compliant?","answer":"Yes, it is ROHS3 compliant."},{"question":"What is the difference between VOM618A-3T and VOM618A-2T?","answer":"The VOM618A-3T has a CTR range of 100% to 200% at 1 mA, while the VOM618A-2T has a CTR range of 63% to 125% at 1 mA. The -3T variant gives you more drive margin for the same LED current, which is useful when driving heavier loads or when the LED drive current is limited."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay/VOM618A-3T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay/VOM618A-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}}