{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"VOS627A-4T","brand":"Vishay","brandSlug":"vishay","productSlug":"VOS627A-4T","canonicalUrl":"https://icboms.com/vishay/VOS627A-4T","factsUrl":"https://icboms.com/api/mcp/products/VOS627A-4T","rawCanonicalId":null},"summary":{"shortDescription":"Vishay VOS627A-4T phototransistor optocoupler, 3750Vrms isolation, AC/DC input, 160-320% CTR at 5mA, 80V output, 4-SOIC surface mount, -55 to 110°C.","salesMarkdown":"The Vishay VOS627A-4T is a single-channel phototransistor optocoupler in a 4-SOIC (4.40 mm width) surface-mount package. It provides 3750Vrms galvanic isolation between input and output, with a transistor output rated for 80 V and 50 mA per channel. The input accepts both AC and DC signals, which makes it useful for sensing AC line presence or bidirectional logic without an external rectifier bridge. The 3750Vrms isolation rating is the key safety parameter for reinforced insulation in mains-connected equipment. It satisfies basic isolation requirements for 240 VAC line monitoring and many industrial bus interfaces (RS-485, CAN) where ground loops need breaking. For designs targeting IEC 60950-1 or IEC 62368-1, this rating supports basic isolation at working voltages up to around 300 VAC, but check creepage and clearance for your specific PCB layout — the 4-SOIC package provides about 4 mm creepage minimum. ## CTR range and drive margin The current transfer ratio is specified at 160% minimum and 320% maximum at a forward current of 5 mA. That means with 5 mA into the LED, the output transistor can sink at least 8 mA (160% of 5 mA) and at most 16 mA. For logic-level outputs, the 160% min ensures a clean low-side drive into a 10 kΩ pull-up to 5 V or 3.3 V. The 320% max matters when the input LED is driven hard — the output can saturate deeper, which reduces Vce(sat) but also increases switching times. If you need tighter CTR tolerance for gain matching across multiple channels, consider the binned versions in this family. ## Switching speed — 3 µs rise/fall Typical rise and fall times are 3 µs each, with turn-on time of 6 µs and turn-off time of 4 µs. This is adequate for data rates up to about 100 kbps or PWM frequencies up to 50 kHz. For higher-speed isolation (1 Mbps+), you would step up to a digital isolator or a logic-output optocoupler. The 3 µs edges are clean enough for most industrial sensor interfaces and relay drivers without extra Schmitt triggering. ## Package and rework — 4-SOIC/SSOP The VOS627A-4T comes in a 4-SOIC package (0.173\" body width, 4.40 mm) also referred to as 4-SSOP. It is a surface-mount part with a 1.27 mm pitch — easy to hand-solder with fine tweezers and a temperature-controlled iron. Under hot air, the small thermal mass means it reflows quickly; set the nozzle to 300°C at low airflow and it lifts clean in about 5 seconds. No exposed pad, so no via-stitch thermal management needed. ## Lifecycle and compliance RoHS compliance is standard for Vishay optocouplers in this series; confirm the specific date-code compliance certificate if your QA requires it.","metaTitle":"Vishay VOS627A-4T Optocoupler, 3750Vrms, 4-SOIC, Active","metaDescription":"Vishay VOS627A-4T phototransistor optocoupler: 3750Vrms isolation, AC/DC input, 160-320% CTR at 5mA, -55 to 110°C, 4-SOIC. Active lifecycle, available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Optoisolators"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Input Type":"AC, 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)":"3µs, 3µs","Voltage - Output (Max)":"80V","Supplier Device Package":"4-SSOP","Current - Output / Channel":"50mA","Current Transfer Ratio (Max)":"320% @ 5mA","Current Transfer Ratio (Min)":"160% @ 5mA","Voltage - Forward (Vf) (Typ)":"1.1V","Turn On / Turn Off Time (Typ)":"6µs, 4µs","Current - DC Forward (If) (Max)":"50 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.70000","currency":"USD"},{"qty":10,"price":"$0.46000","currency":"USD"},{"qty":100,"price":"$0.30400","currency":"USD"},{"qty":1000,"price":"$0.23472","currency":"USD"},{"qty":3000,"price":"$0.21210","currency":"USD"},{"qty":6000,"price":"$0.19796","currency":"USD"},{"qty":15000,"price":"$0.19089","currency":"USD"},{"qty":30000,"price":"$0.18806","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/3de56897baffda6a2dbcd35ae20a1b34.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Can I use VOS627A-4T with AC input signals?","answer":"Yes, the input is specified for both AC and DC signals. That means you can drive the internal LED directly from an AC source (e.g., line voltage through a current-limiting resistor) without adding a bridge rectifier, simplifying AC line sensing circuits."},{"question":"What is the closest pin-compatible alternative to VOS627A-4T?","answer":"Within the Vishay VOS627A family, the VOS627A-4 (non-tape-and-reel variant) shares the same 4-SOIC package and electrical specs. For a broader second-source, look at the TLP185 series from Toshiba or the SFH620A series from Vishay — both offer similar 3750Vrms isolation and phototransistor output in a 4-SOIC footprint, but verify CTR and switching speed against your requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay/VOS627A-4T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay/VOS627A-4T 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}}