{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SFH6343T","brand":"Vishay","brandSlug":"vishay","productSlug":"SFH6343T","canonicalUrl":"https://icboms.com/vishay/SFH6343T","factsUrl":"https://icboms.com/api/mcp/products/SFH6343T","rawCanonicalId":null},"summary":{"shortDescription":"Vishay SFH6343T single-channel transistor-output optocoupler, 4000Vrms isolation, 8-SOIC surface-mount package, DC input, 19% to 50% CTR at 16mA, 250ns/500ns switching, -55°C to 100°C operating range.","salesMarkdown":"## 4000Vrms isolation in an 8-SOIC footprint The Vishay SFH6343T is a single-channel transistor-output optocoupler in an 8-SOIC package, providing 4000Vrms of galvanic isolation between a DC input LED and a phototransistor output. The 8-SOIC (0.154\", 3.90mm width) footprint keeps the coupling on a standard SOIC-8 land pattern, which simplifies layout for designs already using that package for other components. Turn-on and turn-off times of 250ns and 500ns (typical) place this part in the medium-speed optocoupler class — fast enough for most serial data links (RS-485, CAN, SPI at moderate rates) and PWM feedback up to a few hundred kHz, but not a match for high-speed digital isolators that push into the tens of MHz. The current transfer ratio (CTR) is specified at 19% minimum and 50% maximum when the LED forward current is 16mA. That spread means the receiving logic must tolerate a factor-of-2.6 variation in output current across temperature and unit-to-unit; a pull-up resistor or a Schmitt-trigger input on the receiving side is the usual fix. The 25mA absolute maximum forward current gives headroom for driving the LED at 16mA nominal without stressing the junction. ## Temperature range and output rating The output transistor is rated for 25V maximum collector-emitter voltage and 8mA output current per channel — sufficient for 5V and 3.3V logic families, but not for driving relays or high-current loads directly. The 1.6V typical forward voltage of the input LED is standard for infrared emitters and works with 3.3V or 5V logic outputs through a current-limiting resistor. ## Lifecycle and compliance For a production BOM line that needs a single-channel SOIC-8 optocoupler, this part is a low-risk choice for ongoing builds. The ROHS3 compliance covers the full substance restriction list including the four phthalates, which matters for EU-market equipment and for any customer requiring full material disclosure.","metaTitle":"SFH6343T Optocoupler, 4000Vrms, 8-SOIC, Active","metaDescription":"SFH6343T single-channel transistor-output optocoupler with 4000Vrms isolation, 250ns/500ns switching, -55°C to 100°C. Active lifecycle, 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":"8-SOIC (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Number of Channels":"1","Voltage - Isolation":"4000Vrms","Operating Temperature":"-55°C ~ 100°C","Voltage - Output (Max)":"25V","Supplier Device Package":"8-SOIC","Current - Output / Channel":"8mA","Current Transfer Ratio (Max)":"50% @ 16mA","Current Transfer Ratio (Min)":"19% @ 16mA","Voltage - Forward (Vf) (Typ)":"1.6V","Turn On / Turn Off Time (Typ)":"250ns, 500ns","Current - DC Forward (If) (Max)":"25 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.06","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$2.10000","currency":"USD"},{"qty":10,"price":"$1.40200","currency":"USD"},{"qty":100,"price":"$1.07930","currency":"USD"},{"qty":500,"price":"$0.97562","currency":"USD"},{"qty":1000,"price":"$0.83842","currency":"USD"},{"qty":2000,"price":"$0.79269","currency":"USD"},{"qty":6000,"price":"$0.77440","currency":"USD"},{"qty":10000,"price":"$0.76220","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/9b377eb4ae2bb3d8fd8761ecf2e6adfc.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the current transfer ratio of SFH6343T?","answer":"The SFH6343T has a CTR range of 19% minimum to 50% maximum, specified at an LED forward current of 16mA. This is the ratio of output collector current to input LED current, and it determines how much drive current the receiving side sees for a given LED current."},{"question":"Is SFH6343T compatible with 5V logic?","answer":"Yes. With a 25V maximum output voltage and 8mA output current capability, the SFH6343T can directly interface with 5V logic families. The 1.6V typical forward voltage of the input LED is also compatible with 5V logic outputs when a current-limiting resistor is used."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay/SFH6343T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay/SFH6343T 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}}