{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ISO7731FDBQ","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"ISO7731FDBQ","canonicalUrl":"https://icboms.com/texas-instruments/ISO7731FDBQ","factsUrl":"https://icboms.com/api/mcp/products/ISO7731FDBQ","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments ISO7731FDBQ, General Purpose digital isolator, 3 channels unidirectional, capacitive coupling, 100Mbps data rate, 3000Vrms isolation, 16-SSOP package, -55°C~125°C.","salesMarkdown":"## Three-channel capacitive isolator for signal-chain galvanic separation The Texas Instruments ISO7731FDBQ is a three-channel digital isolator using capacitive coupling technology to provide galvanic isolation across a 3000 Vrms barrier. It supports unidirectional data transmission at 100 Mbps across three channels configured as two on side 1 and one on side 2. With a propagation delay of 16 ns max and pulse-width distortion under 4.9 ns, this isolator suits timing-sensitive interfaces like SPI, UART, and general-purpose digital I/O where signal integrity across the isolation boundary matters. The 85 kV/µs common-mode transient immunity rating means it holds its state through fast voltage transients typical in motor drives, inverters, and industrial power stages. The 100 Mbps data rate covers most digital interfaces used in industrial control — SPI clocks up to 50 MHz, UART at several Mbps, and parallel status lines. The 16 ns max propagation delay (same for rising and falling edges) adds about 32 ns round-trip to a handshake, which is negligible for most control loops but worth budgeting if the design closes a feedback path through the isolation barrier at high speed. Pulse-width distortion at 4.9 ns max keeps the duty cycle distortion low enough that the isolator won't introduce jitter that trips clocked receivers. The 1.3 ns rise and 1.4 ns fall times are symmetric, which helps maintain signal shape through the capacitive coupling stage. Rated across the full military temperature range, the ISO7731FDBQ is specified for environments that see extreme thermal cycling: outdoor telecom cabinets, engine-bay electronics, downhole instrumentation, and avionics bays.","metaTitle":"TI ISO7731FDBQ 3-Ch Digital Isolator, 100 Mbps, 3000 Vrms","metaDescription":"Texas Instruments ISO7731FDBQ 3-channel digital isolator with capacitive coupling, 100 Mbps data rate, 3000 Vrms isolation, -55°C to 125°C range.","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-SSOP (0.154\\\", 3.90mm Width)","Product Status":"Active","lifecycle_stage":"eol_hot","Voltage - Supply":"2.25V ~ 5.5V","Number of Channels":"3","Base Product Number":"ISO7731","Voltage - Isolation":"3000Vrms","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-SSOP","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":"$3.0300","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/1faeef4a4392056447302f5819fac3d4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between ISO7731FDBQ and ISO7730FDBQ?","answer":"The ISO7731FDBQ has a 2/1 channel configuration (two inputs on side 1, one on side 2), while the ISO7730FDBQ uses a 3/0 channel configuration (all three channels oriented the same direction). The channel direction mapping is the primary difference between the two devices in the same family."},{"question":"Can ISO7731FDBQ be used for I2C isolation?","answer":"I2C requires bidirectional data lines, and the ISO7731FDBQ has unidirectional channels only. For I2C isolation you would typically need a dedicated I2C isolator with bidirectional capability or an external direction-control scheme. This part is better suited for unidirectional signals like SPI, UART, or discrete I/O."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/ISO7731FDBQ","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/ISO7731FDBQ 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}}