{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LTC4309IDE#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LTC4309IDEPBF","canonicalUrl":"https://icboms.com/analog-devices/LTC4309IDEPBF","factsUrl":"https://icboms.com/api/mcp/products/LTC4309IDE%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LTC4309IDE#PBF, I2C Buffer and Accelerator, 2-Wire Bus Input/Output, 400 kHz Data Rate, 2.3V-5.5V Supply, 2 Channels, 12-WFDFN Exposed Pad Package, -40°C to 85°C, Tube.","salesMarkdown":"## I2C bus buffer with hot-swap — what it does on the board The LTC4309IDE#PBF from Analog Devices is a two-channel I2C bus buffer and accelerator designed for hot-swap applications. It sits between a live backplane and a plug-in card, isolating bus capacitance and preventing data corruption during insertion or removal. The part operates from a 2.3 V to 5.5 V supply, drawing 7 mA typical, and supports standard I2C data rates up to 400 kHz (Fast Mode). Its 10 pF input capacitance keeps the bus load light on the upstream controller side. ## Hot-swap sequencing and bus isolation The device detects a valid bus voltage on its supply pin before connecting the upstream and downstream bus segments. This prevents glitches and stuck buses when a card is plugged into a live system. ## Package and board layout notes Housed in a 12-lead WFDFN with exposed pad (4x3 mm DFN), the part requires a surface-mount footprint with a thermal via pattern under the pad for heat sinking. ## Lifecycle and sourcing posture The LTC4309IDE#PBF carries an Active product status with ROHS3 compliance.","metaTitle":"LTC4309IDE#PBF I2C Buffer Accelerator, Hot-Swap, 400 kHz","metaDescription":"LTC4309IDE#PBF I2C buffer and accelerator with hot-swap capability. 2.3V-5.5V supply, 400 kHz data rate, 2 channels, 12-DFN package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["DC-DC Power Modules"],"specifications":{"Type":"Buffer, Accelerator","Input":"2-Wire Bus","Output":"2-Wire Bus","Package":"Tube","Applications":"I2C - Hotswap","Mounting Type":"Surface Mount","Package / Case":"12-WFDFN Exposed Pad","Data Rate (Max)":"400kHz","lifecycle_stage":"eol_hot","Current - Supply":"7mA","Voltage - Supply":"2.3V ~ 5.5V","Number of Channels":"2","Capacitance - Input":"10 pF","Operating Temperature":"-40°C ~ 85°C","Supplier Device Package":"12-DFN (4x3)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$7.81","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$7.81000","currency":"USD"},{"qty":10,"price":"$7.05700","currency":"USD"},{"qty":91,"price":"$5.84286","currency":"USD"},{"qty":273,"price":"$5.58026","currency":"USD"},{"qty":546,"price":"$5.08788","currency":"USD"},{"qty":1001,"price":"$4.43138","currency":"USD"}]},"links":{"datasheetUrl":"https://www.analog.com/media/en/technical-documentation/data-sheets/4309fa.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Does LTC4309IDE#PBF support hot-swap of I2C devices?","answer":"Yes, the LTC4309 is specifically designed for I2C hot-swap applications. It prevents data corruption and bus stalls when cards are inserted into or removed from a live backplane."},{"question":"What is the maximum data rate supported by LTC4309IDE#PBF?","answer":"The maximum data rate is 400 kHz, which corresponds to standard I2C Fast Mode. It does not support Fast Mode Plus (1 MHz) or high-speed mode."},{"question":"When sourcing LTC4309IDE#PBF, what's the closest functional sibling?","answer":"The LTC4308IDD#PBF is the closest same-function sibling — same 400 kHz data rate, 2.3 V supply minimum, two channels, and I2C hot-swap application. The main difference is the package: LTC4308IDD#PBF comes in a 10-DFN versus the 12-DFN of the LTC4309. Verify PCB footprint compatibility before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LTC4309IDEPBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LTC4309IDEPBF 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}}