{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S2739-EQC50-A2","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S2739-EQC50-A2","canonicalUrl":"https://icboms.com/texas-instruments/LM3S2739-EQC50-A2","factsUrl":"https://icboms.com/api/mcp/products/LM3S2739-EQC50-A2","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris® ARM® Cortex®-M3S 2000 LM3S2739-EQC50-A2, 32-Bit Single-Core MCU, 50MHz, 128KB (128K x 8) FLASH, 64K x 8 SRAM, 56 I/O, CANbus, I²C, IrDA, Microwire, QEI, SPI, SSI, UART/USART, A/D 4x10b, 2.25V ~ 2.75V, -40°C~105°C, 100-LQFP.","salesMarkdown":"The LM3S2739-EQC50-A2: A 3.3 V system needs a regulator (e.g., a 2.5 V LDO) to feed this part, and the regulator's dropout and accuracy must hold the rail inside that window across load steps. The I/O pins are not 5 V tolerant — driving them with 3.3 V logic without level shifting risks exceeding the absolute maximum. For designs already running a 2.5 V digital core, this part drops straight in; for existing 3.3 V boards it adds a regulator and level translators to the BOM. No current-production successor with the same pinout and peripheral set has been designated — the Stellaris line was migrated to the Tiva C Series, but those devices use a different package and register map. There is no last-time-buy window — the part is already past that stage, so the procurement decision is whether to commit to a broker-sourced lot for the remaining build volume or to begin a redesign. ## Peripheral count for system integration Includes one CAN controller, two I²C modules, two SPI/SSI ports, and up to three UARTs (one with IrDA). QEI handles incremental encoder feedback directly. Supplied in a 100-pin LQFP (14x14 mm body), surface-mount only.","metaTitle":"LM3S2739-EQC50-A2 TI Stellaris ARM Cortex-M3 MCU, 50MHz","metaDescription":"Texas Instruments LM3S2739-EQC50-A2 ARM Cortex-M3 MCU, 50MHz, 128KB Flash, 64KB SRAM, 56 I/O, CANbus, -40 to 105°C, 2.25-2.75V. Obsolete.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Mfr":"Texas Instruments","Speed":"50MHz","Series":"Stellaris® ARM® Cortex®-M3S 2000","Package":"Tray","RAM Size":"64K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, POR, PWM, WDT","Connectivity":"CANbus, I²C, IrDA, Microwire, QEI, SPI, SSI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"56","Core Processor":"ARM® Cortex®-M3","Package / Case":"100-LQFP","Product Status":"Obsolete","Data Converters":"A/D 4x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S2739","Program Memory Size":"128KB (128K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~105°C(TA)","Supplier Device Package":"100-LQFP (14x14)","Voltage - Supply (Vcc/Vdd)":"2.25V ~ 2.75V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/e578ba8ea9aa738439f0d34e3213a748.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S2739-EQC50-A2/alternatives.json"},"ai":{"faq":[{"question":"Is LM3S2739-EQC50-A2 obsolete and what is the replacement?","answer":"Yes, this part is officially obsolete. Texas Instruments has not designated a direct pin-compatible or drop-in replacement within the same family. The Stellaris line has been superseded by the Tiva C Series, but those MCUs use a different package and register map, requiring a firmware and PCB redesign. For existing BOMs, the only sourcing path is the surplus market."},{"question":"Can LM3S2739-EQC50-A2 be used with 3.3V logic?","answer":"Not directly. Interfacing with 3.3 V logic requires a level shifter or an LDO to drop the rail to 2.5 V. The I/O thresholds scale with VDD, so a 2.5 V supply means the input high threshold is around 1.75 V — which is still compatible with 3.3 V CMOS outputs if the source can drive the lower rail."},{"question":"Does LM3S2739-EQC50-A2 have CAN bus and how many UARTs?","answer":"Yes, it includes one CAN 2.0 controller. The connectivity block also provides up to three UARTs (one with IrDA support), two I²C modules, two SPI/SSI ports, and a quadrature encoder interface (QEI)."},{"question":"Where can I buy LM3S2739-EQC50-A2?","answer":"Since the part is obsolete, stock is limited to existing inventory lots and new-old-stock holdings."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S2739-EQC50-A2","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S2739-EQC50-A2 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}}