{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S5D51-IQC80-A1","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S5D51-IQC80-A1","canonicalUrl":"https://icboms.com/texas-instruments/LM3S5D51-IQC80-A1","factsUrl":"https://icboms.com/api/mcp/products/LM3S5D51-IQC80-A1","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris® ARM® Cortex®-M3S 5000 series LM3S5D51-IQC80-A1, 32-Bit Single-Core MCU, 80MHz, 512KB Flash, 96K x 8 RAM, 100-LQFP, -40°C~85°C.","salesMarkdown":"At 80 MHz the Cortex-M3 delivers roughly 1.25 DMIPS/MHz, so the LM3S5D51 can sustain about 100 MIPS of integer throughput. That is enough to run a control loop with a 100 µs period, service a USB bulk transfer, and keep a CAN stack alive without resorting to the DMA engine — though the part does include a DMA controller for offloading memory-to-peripheral moves. The internal oscillator is available, but for CAN or USB operation an external crystal is recommended to keep the bit timing within tolerance across temperature. ## Memory map and firmware staging The 512 KB Flash is organised as 512K x 8 and is used for both code and constant data. With a typical RTOS kernel taking 20–40 KB and a USB stack another 30–50 KB, there is room left for application logic and a small file system. The 96 KB SRAM is split across multiple blocks in the memory map; the exact partitioning matters if you are allocating large DMA buffers or a USB packet buffer — check the memory map in the datasheet to avoid fragmentation. The Flash endurance is rated for 100k write/erase cycles per sector, which is fine for field-upgradeable firmware if you use a wear-leveling scheme in the bootloader. ## Connectivity and I/O count With 67 GPIOs brought out on the 100-pin LQFP, the LM3S5D51 can support a parallel LCD interface, a keypad matrix, and several serial ports simultaneously. The connectivity list includes USB OTG (with built-in PHY), two CAN 2.0B controllers, IrDA, LIN, and a Quadrature Encoder Interface (QEI) for motor position feedback. The 16-channel 12-bit ADC samples at up to 1 Msps — adequate for reading potentiometers, current-sense resistors, or thermistor inputs in a motor-drive or HMI application. The supply range of 3.0 V to 3.6 V means a single 3.3 V rail powers the core and I/O — no separate 1.8 V core supply needed. There is no official TI successor listed for this exact order code, and the Stellaris family has been superseded by the Tiva™ C Series and later TM4C devices. If you are evaluating a drop-in replacement, the closest functional match within the same footprint and peripheral set would be a TM4C123 or TM4C129 part from TI's current portfolio, but pin compatibility and software migration need to be verified against your specific board revision.","metaTitle":"LM3S5D51-IQC80-A1 Stellaris ARM Cortex-M3 MCU, 80 MHz","metaDescription":"LM3S5D51-IQC80-A1 is a 32-bit Stellaris ARM Cortex-M3 MCU with 80 MHz core, 512 KB Flash, 96 KB RAM, USB OTG, CAN, industrial temp.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Mfr":"Texas Instruments","Speed":"80MHz","Series":"Stellaris® ARM® Cortex®-M3S 5000","Package":"Tray","RAM Size":"96K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT","Connectivity":"CANbus, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB OTG","Mounting Type":"Surface Mount","Number of I/O":"67","Core Processor":"ARM® Cortex®-M3","Package / Case":"100-LQFP","Product Status":"Obsolete","Data Converters":"A/D 16x12b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S5D51","Program Memory Size":"512KB (512K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"100-LQFP (14x14)","Voltage - Supply (Vcc/Vdd)":"3V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/155f86a79399d557c53ddac296b69c45.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S5D51-IQC80-A1/alternatives.json"},"ai":{"faq":[{"question":"What is the replacement for LM3S5D51-IQC80-A1?","answer":"Texas Instruments has not published a direct pin-compatible replacement for this specific order code. The closest functional successors in TI's current portfolio are the Tiva™ C Series TM4C123 or TM4C129 microcontrollers, which share the Cortex-M4F core and similar peripheral sets. However, pin mapping, register layout, and software drivers differ — a full board respin and firmware port are required. For a like-for-like drop-in on an existing PCB, the only option is sourcing the original LM3S5D51-IQC80-A1 through the surplus market."},{"question":"Does LM3S5D51-IQC80-A1 have an alternative from another manufacturer?","answer":"There is no second-source manufacturer for this exact Stellaris part. The LM3S5D51 is a proprietary TI design with no licensed alternate. If you need a functional equivalent from another vendor, consider NXP's LPC17xx series or STMicroelectronics' STM32F1/F4 series — both offer Cortex-M3/M4 cores with similar memory and peripheral mixes, but the pinout, register map, and software stack are completely different."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S5D51-IQC80-A1","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S5D51-IQC80-A1 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}}