{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S3749-IQC50-A0T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S3749-IQC50-A0T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S3749-IQC50-A0T","factsUrl":"https://icboms.com/api/mcp/products/LM3S3749-IQC50-A0T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 3000 series LM3S3749-IQC50-A0T, 32-bit single-core MCU, 50 MHz, 128 KB Flash, 64 KB SRAM, 2.25 V–2.75 V supply, 61 I/O, USB/SPI/I2C/UART/SSI/QEI, 8x10b ADC, -40°C to 85°C, 100-LQFP.","salesMarkdown":"## 128 KB Flash, 64 KB SRAM — memory sizing for the firmware budget The 128 KB Flash is organized as 128K x 8, typical for mid-range Cortex-M3 parts of this generation. The 64 KB SRAM (64K x 8) is the standout: many competing MCUs at the same price point offered 32 KB or 48 KB. That extra SRAM headroom matters when the application runs a USB stack, a small RTOS, and a communications protocol simultaneously — the memory map can hold the stack and heap without thrashing. For designs that need to log sensor data or buffer serial streams, the 64 KB SRAM reduces the need for an external serial SRAM or FRAM. No stock or lead-time number is published here because the spot market for an obsolete MCU moves week to week. If your design can accept a pin-compatible alternate, the LM3S3749 family includes other speed and memory variants in the same 100-LQFP footprint — but no direct replacement is listed on the official record.","metaTitle":"Texas Instruments LM3S3749-IQC50-A0T ARM Cortex-M3 MCU","metaDescription":"Texas Instruments Stellaris LM3S3749-IQC50-A0T ARM Cortex-M3 MCU, 50 MHz, 128 KB Flash, 64 KB SRAM, USB, -40°C to 85°C, 100-LQFP.","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 3000","Package":"Tape & Reel (TR)","RAM Size":"64K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, DMA, POR, PWM, WDT","Connectivity":"I²C, IrDA, Microwire, QEI, SPI, SSI, UART/USART, USB","Mounting Type":"Surface Mount","Number of I/O":"61","Core Processor":"ARM® Cortex®-M3","Package / Case":"100-LQFP","Product Status":"Obsolete","Data Converters":"A/D 8x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S3749","Program Memory Size":"128KB (128K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"100-LQFP (14x14)","Voltage - Supply (Vcc/Vdd)":"2.25V ~ 2.75V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$23.4530","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/54dc75c8b8c4ac4918787aa9d2f409f1.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S3749-IQC50-A0T/alternatives.json"},"ai":{"faq":[{"question":"Is LM3S3749-IQC50-A0T obsolete?","answer":"Yes, the LM3S3749-IQC50-A0T carries an obsolete lifecycle status."},{"question":"Does LM3S3749-IQC50-A0T have USB?","answer":"Yes, the connectivity set includes USB alongside I²C, IrDA, Microwire, QEI, SPI, SSI, and UART/USART."},{"question":"What is the replacement for LM3S3749-IQC50-A0T?","answer":"For a legacy BOM that requires this exact MCU, the only channel is the independent surplus market. If your design can accept a different part, the LM3S3749 family includes other speed and memory variants in the same 100-LQFP footprint, but no direct pin-compatible successor is documented."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S3749-IQC50-A0T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S3749-IQC50-A0T 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}}