{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ISO7731DBQ","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"ISO7731DBQ","canonicalUrl":"https://icboms.com/texas-instruments/ISO7731DBQ","factsUrl":"https://icboms.com/api/mcp/products/ISO7731DBQ","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments ISO7731DBQ general-purpose digital isolator, capacitive coupling, 3 unidirectional channels, 100Mbps data rate, 3000Vrms isolation, 16-SSOP package, -55 to 125°C operating temperature.","salesMarkdown":"## What the ISO7731DBQ does on your board The TI ISO7731DBQ is a three-channel digital isolator using capacitive coupling to pass digital signals across a galvanic isolation barrier. It delivers 100Mbps per channel with 16ns propagation delay and 4.9ns pulse-width distortion, which keeps timing margin clean for SPI, UART, and general-purpose logic isolation. The 3000Vrms isolation rating covers reinforced insulation requirements for industrial fieldbus, motor-drive feedback, and medical patient-interface separation. With 85kV/µs common-mode transient immunity, it handles the fast voltage slew rates in inverter and switching power supply environments without bit errors. ## Three channels, two directions — routing the isolation barrier The channel configuration is 2 inputs on side 1, 1 input on side 2 — all unidirectional. That maps cleanly to isolating a 2-wire SPI bus (SCLK, MOSI from the controller) plus a single feedback signal (MISO from the peripheral), or to breaking ground loops on three discrete control lines. The 2.25V to 5.5V supply range on each side lets you level-shift between 2.5V, 3.3V, and 5V domains without external translation. The 1.3ns typical rise/fall time preserves signal integrity at 100Mbps, but the fast edges also mean the PCB layout needs controlled impedance traces if the isolation channel runs more than a few centimetres. The 16-SSOP package (3.90mm body width) fits compact multi-channel isolation modules without consuming excessive board area. No isolated power on-chip — you supply separate isolated rails on each side, which is the typical approach for discrete isolators in distributed systems. ## Active lifecycle — no LTB concern TI lists the ISO7731DBQ as Active. That means no last-time-buy risk for production programs currently qualifying it, and no pressure to redesign for a drop-in replacement. The base product number ISO7731 covers a family of channel-direction variants in the same 16-SSOP footprint, so if a design later needs a different channel mix (e.g., ISO7730DBQ with 3/0 direction), the PCB layout stays the same.","metaTitle":"TI ISO7731DBQ digital isolator, 100Mbps, 3000Vrms, 16-SSOP","metaDescription":"TI ISO7731DBQ general-purpose capacitive-coupling digital isolator: 3 channels, 100Mbps, 3000Vrms isolation, 85kV/µs CMTI, -55 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":"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":"Does ISO7731DBQ replace ISO7221?","answer":"The ISO7221 is an older dual-channel isolator with different channel direction and lower data rate. The ISO7731DBQ is not a direct pin-compatible replacement — the pinout and channel count differ. For a drop-in replacement, check the ISO7731 family's pin-compatible variants or consult the TI cross-reference guide for the specific ISO7221 package option."},{"question":"What is the difference between ISO7731DBQ and ISO7730DBQ?","answer":"The ISO7731DBQ has a 2/1 channel direction (two inputs on side 1, one on side 2). The ISO7730DBQ has all three channels oriented in the same direction (3/0). Choose based on whether you need a reverse-direction channel across the barrier."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/ISO7731DBQ","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/ISO7731DBQ 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}}