{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ISO1643DWR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"ISO1643DWR","canonicalUrl":"https://icboms.com/texas-instruments/ISO1643DWR","factsUrl":"https://icboms.com/api/mcp/products/ISO1643DWR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments ISO164x series, I²C, SPI Digital Isolator, Capacitive Coupling, 4-Channel, 5000 Vrms, 50 Mbps, 16-SOIC, -40°C to 125°C.","salesMarkdown":"## 50 Mbps capacitive isolator for I²C and SPI buses The Texas Instruments ISO1643DWR is a 4-channel digital isolator using capacitive coupling, supporting both I²C and SPI communication at data rates up to 50 Mbps. The part is configured with four inputs on side 1 and two on side 2, handling bidirectional (I²C) and unidirectional (SPI) channels in a single device. This makes it a fit for mixed-bus isolation in industrial fieldbus interfaces, motor drives, and isolated sensor links where the protocol isn't purely I²C or purely SPI. ## 5000 Vrms isolation with 50 kV/µs CMTI The isolation rating of 5000 Vrms covers reinforced isolation requirements for industrial and medical equipment where the barrier must withstand high-voltage transients. The common-mode transient immunity of 50 kV/µs (minimum) is the spec that matters when this isolator sits between a noisy motor-drive power stage and a controller — fast switching edges on the high-voltage side must not couple through and corrupt the low-voltage bus. Propagation delay is 70 ns (tpLH) and 88 ns (tpHL) maximum, with pulse-width distortion capped at 45 ns, which leaves timing margin for 50 Mbps SPI without needing to slow the clock. ## Hot-swappable and robust-EMC design The device is described as hot-swappable with robust-EMC bidirectional operation. Hot-swappability means the isolator can be inserted into or removed from a live bus without latching up or disrupting the bus state — useful in modular I/O systems where cards are swapped under power. The robust-EMC characterization suggests the part has been designed to maintain data integrity in electrically noisy environments, which aligns with the 50 kV/µs CMTI figure. ## Package and temperature grade Housed in a 16-SOIC wide-body (0.295-inch width, 7.50 mm) package, surface-mount. The wide-body SOIC provides creepage distance for the 5000 Vrms isolation rating — important for PCB layout where clearance and creepage must meet IEC 60950 or 60601 spacing rules.","metaTitle":"ISO1643DWR I²C/SPI Isolator, 50 Mbps, 5000 Vrms, 16-SOIC","metaDescription":"TI ISO1643DWR capacitive-coupling isolator supports I²C and SPI at 50 Mbps with 5000 Vrms isolation. Active, ROHS3, -40°C to 125°C.","metaKeywords":null},"attributes":{"series":"ISO164x","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Digital Isolators"],"specifications":{"Type":"I²C, SPI","Series":"ISO164x","Package":"Tape & Reel (TR); Cut Tape (CT)","Data Rate":"50Mbps","Technology":"Capacitive Coupling","Channel Type":"Bidirectional, Unidirectional","Mounting Type":"Surface Mount","Isolated Power":"No","Package / Case":"16-SOIC (0.295\\\", 7.50mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"3V ~ 5.5V","Number of Channels":"4","Voltage - Isolation":"5000Vrms","Operating Temperature":"-40°C ~ 125°C","Inputs - Side 1/Side 2":"4/2","Rise / Fall Time (Typ)":"24ns, 16ns","Supplier Device Package":"16-SOIC","Pulse Width Distortion (Max)":"45ns","Propagation Delay tpLH / tpHL (Max)":"70ns, 88ns","Common Mode Transient Immunity (Min)":"50kV/µs"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.62","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$5.62000","currency":"USD"},{"qty":10,"price":"$5.05200","currency":"USD"},{"qty":25,"price":"$4.77600","currency":"USD"},{"qty":100,"price":"$4.13910","currency":"USD"},{"qty":250,"price":"$3.92680","currency":"USD"},{"qty":500,"price":"$3.52350","currency":"USD"},{"qty":1000,"price":"$2.97163","currency":"USD"},{"qty":2000,"price":"$2.82305","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/d3c7981f21cf5830f2ebdf0953670ec4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the data rate of ISO1643DWR?","answer":"The ISO1643DWR supports data rates up to 50 Mbps, which covers standard I²C (typically 400 kHz to 1 MHz) and high-speed SPI (up to 50 MHz) without needing to reduce the clock rate."},{"question":"Can ISO1643DWR be used for SPI communication?","answer":"Yes, the ISO1643DWR is specified for both I²C and SPI. The unidirectional channels handle SPI's MOSI/MISO lines, while the bidirectional channels handle I²C's SDA/SCL. The 50 Mbps data rate is sufficient for most SPI applications."},{"question":"What is the difference between ISO1643 and ISO1640?","answer":"The ISO1643DWR provides four channels with a 4/2 input split (side 1/side 2) and supports both bidirectional and unidirectional operation for I²C and SPI. The ISO1640DWR is a 2-channel device with a 2/2 input split, bidirectional only, and is limited to I²C. The ISO1643 is the part to pick when you need SPI isolation alongside I²C on the same device."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/ISO1643DWR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/ISO1643DWR 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}}