{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ISO7731FDBQR","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"ISO7731FDBQR","canonicalUrl":"https://icboms.com/texas-instruments/ISO7731FDBQR","factsUrl":"https://icboms.com/api/mcp/products/ISO7731FDBQR","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments ISO7731FDBQR, General Purpose digital isolator, 3-channel unidirectional, Capacitive Coupling, 100Mbps data rate, 3000Vrms isolation, 85kV/µs CMTI, 2.25V~5.5V supply, -55°C~125°C, 16-SSOP package.","salesMarkdown":"## Three-channel capacitive isolator for harsh industrial environments The Texas Instruments ISO7731FDBQR is a three-channel, unidirectional digital isolator using capacitive coupling technology to provide galvanic isolation up to 3000Vrms. It is designed for general-purpose signal isolation in industrial automation, motor drives, power supplies, and isolated communication interfaces where noise immunity and signal integrity across the barrier are critical. With a 100Mbps data rate, 16ns max propagation delay, and 1.3ns/1.4ns typical rise/fall times, this part handles high-speed digital signals like SPI, UART, and PWM without introducing significant timing skew or jitter. The wide supply range from 2.25V to 5.5V on both sides allows direct interface with 3.3V and 5V logic families without external level translation, simplifying the power architecture. ## 85 kV/µs CMTI — why it matters for motor drives and inverters The minimum common-mode transient immunity of 85kV/µs is the standout parameter for applications with fast-switching power stages. In a motor drive or DC-DC converter, the switching node can slew at tens of kV/µs. A lower CMTI isolator would let that transient couple across the barrier as a data error or latch-up. The ISO7731FDBQR's 85kV/µs floor keeps the output state valid through those edges, which is the difference between a clean feedback loop and a faulted gate driver. No separate high-rel screening step is needed for the temperature grade itself. ## Channel assignment: 2 inputs on Side 1, 1 input on Side 2 The three unidirectional channels are split as two inputs on Side 1 and one input on Side 2. This 2/1 configuration maps directly to common SPI isolation: two forward channels for SCLK and MOSI (or CS), and one reverse channel for MISO. For UART isolation, the two forward channels can carry TX and a control signal, with the reverse channel for RX. The unidirectional nature means no bidirectional data lines — plan your signal direction accordingly. ## Package and footprint: 16-SSOP with 3.90mm body width Housed in a 16-pin SSOP package with a 3.90mm body width and 0.154\" pitch, the ISO7731FDBQR occupies a compact footprint suitable for space-constrained multi-channel isolation on a single board. The surface-mount package is compatible with standard reflow soldering processes.","metaTitle":"TI ISO7731FDBQR Digital Isolator, 3-Ch, 100Mbps, 3000Vrms","metaDescription":"TI ISO7731FDBQR: 3-channel unidirectional capacitive isolation, 100Mbps data rate, 3000Vrms isolation, 85kV/µs CMTI, -55°C to 125°C.","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":"Tape & Reel (TR); Cut Tape (CT)","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":"$2.6600","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/1faeef4a4392056447302f5819fac3d4.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is ISO7731FDBQR compatible with 5V logic?","answer":"Yes. The supply voltage range of 2.25V to 5.5V on both sides means the part operates directly from a 5V rail. The logic inputs and outputs are referenced to their respective supply, so 5V CMOS levels are compatible without any external level shifting."},{"question":"What is the closest pin-compatible alternative to ISO7731FDBQR?","answer":"Within the same TI ISO7731 family, the ISO7731FDWR is a functional equivalent with the same channel configuration and isolation rating. The suffix difference (FDBQR vs FDWR) indicates packaging variant — the FDWR comes in a wider SOIC-16 package. Verify the footprint compatibility for your board layout before substituting."},{"question":"Where can I buy ISO7731FDBQR and how do I get a price?","answer":"Submit an RFQ for current availability and pricing — stock levels and market price are confirmed at quote time, not listed publicly."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/ISO7731FDBQR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/ISO7731FDBQR 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}}