{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ISO7731FDW","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"ISO7731FDW","canonicalUrl":"https://icboms.com/texas-instruments/ISO7731FDW","factsUrl":"https://icboms.com/api/mcp/products/ISO7731FDW","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments ISO7731FDW, General Purpose digital isolator, 3-channel unidirectional, Capacitive Coupling, 100Mbps data rate, 5000Vrms isolation, 2.25V~5.5V supply, -55°C~125°C, 16-SOIC.","salesMarkdown":"## 5000 Vrms isolation — the safety-barrier spec that decides fit The Texas Instruments ISO7731FDW is a 3-channel, unidirectional digital isolator using capacitive coupling technology. Its headline rating is 5000 Vrms isolation voltage, which qualifies it for reinforced insulation in mains-connected industrial and medical equipment where a safety barrier is required between the high-voltage and low-voltage domains. The part supports a 100 Mbps data rate, matching the throughput of common serial buses like SPI, UART, and CAN FD without adding latency. ## 85 kV/µs CMTI — why it holds up in motor drives and inverters Common-mode transient immunity is rated at a minimum of 85 kV/µs. In a motor-drive or solar-inverter environment where IGBT or SiC switching edges produce fast voltage transients across the isolation barrier, a low CMTI part can falsely toggle its output. This rating means the ISO7731FDW maintains data integrity through those events. Propagation delay is symmetrical at 16 ns max for both low-to-high and high-to-low transitions, with pulse-width distortion held to 4.9 ns max — tight enough for timing-sensitive interfaces like isolated SPI clock lines. ## 3-channel unidirectional — 2 forward, 1 reverse The channel configuration is 2 inputs on side 1 and 1 input on side 2, all unidirectional. This suits applications where two data lines cross the barrier in one direction (e.g., TX and clock from a controller to a peripheral) and one line returns in the opposite direction (e.g., RX or fault feedback). The part does not include an integrated isolated DC-DC converter — isolated power must be supplied externally.","metaTitle":"TI ISO7731FDW Digital Isolator, 5000 Vrms, 100 Mbps, 16-SOIC","metaDescription":"Texas Instruments ISO7731FDW: 3-channel capacitive-coupling digital isolator, 5000 Vrms isolation, 100 Mbps data rate, -55°C to 125°C, 16-SOIC.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Digital Isolators"],"specifications":{"Mfr":"Texas Instruments","Type":"General Purpose","Series":"-","Package":"Tube","Data Rate":"100Mbps","Technology":"Capacitive Coupling","Channel Type":"Unidirectional","Mounting Type":"Surface Mount","Isolated Power":"No","Package / Case":"16-SOIC (0.295\\\", 7.50mm Width)","Product Status":"Active","lifecycle_stage":"eol_hot","Voltage - Supply":"2.25V ~ 5.5V","Number of Channels":"3","Base Product Number":"ISO7731","Voltage - Isolation":"5000Vrms","Operating Temperature":"-55°C~125°C","Inputs - Side 1/Side 2":"2/1","Rise / Fall Time (Typ)":"1.3ns, 1.4ns","Supplier Device Package":"16-SOIC","Pulse Width Distortion (Max)":"4.9ns","Propagation Delay tpLH / tpHL (Max)":"16ns, 16ns","Common Mode Transient Immunity (Min)":"85kV/µs"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.5400","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/4bb33d1fcdd7379b943657a154225ada.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What data rate does ISO7731FDW support?","answer":"The ISO7731FDW supports a data rate of 100 Mbps, suitable for SPI, UART, CAN FD, and other common serial interfaces."},{"question":"ISO7731FDW vs ISO7721: what are the differences?","answer":"The ISO7731FDW is a 3-channel unidirectional isolator (2 forward, 1 reverse), while the ISO7721 is a 2-channel device. The channel count and directionality are the primary differences; both share the same capacitive coupling technology, 5000 Vrms isolation rating, and 100 Mbps data rate capability. The choice depends on how many isolated signal paths your application requires."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/ISO7731FDW","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/ISO7731FDW 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}}