{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S2939-IQC50-A2","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S2939-IQC50-A2","canonicalUrl":"https://icboms.com/texas-instruments/LM3S2939-IQC50-A2","factsUrl":"https://icboms.com/api/mcp/products/LM3S2939-IQC50-A2","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris® ARM® Cortex®-M3S 2000 series MCU, LM3S2939-IQC50-A2, 32-Bit Single-Core, 50MHz, 256KB Flash, 64K x 8 RAM, 100-LQFP, -40°C~85°C.","salesMarkdown":"## What this Stellaris Cortex-M3 brings to the board The LM3S2939-IQC50-A2: It is packaged in a 100-pin LQFP (14x14 mm) for surface-mount assembly. The 50 MHz Cortex-M3 delivers roughly 1.25 DMIPS/MHz, or about 62.5 DMIPS peak. That is enough headroom for a single motor-control FOC loop running at 20 kHz with sensor feedback, or a CAN gateway handling a few hundred messages per second. The 64 KB SRAM supports moderate-sized data buffers and a real-time OS with a few tasks. If your application needs more throughput or memory, the 50 MHz ceiling and 256 KB Flash define the upper bound of this part's capability. ## Connectivity and I/O for industrial bus integration The CAN interface lets it sit on a factory-floor network; the QEI reads incremental encoder pulses directly without external logic. The 3-channel 10-bit ADC provides basic analog sampling for current sensing or potentiometer feedback. The internal oscillator reduces external BOM count, though a crystal can be added for tighter timing accuracy.","metaTitle":"LM3S2939-IQC50-A2 Stellaris ARM Cortex-M3 MCU, 50MHz","metaDescription":"TI/Stellaris LM3S2939-IQC50-A2 ARM Cortex-M3 MCU: 50MHz, 256KB Flash, 64KB SRAM, 57 I/O, industrial -40°C to 85°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","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":"57","Core Processor":"ARM® Cortex®-M3","Package / Case":"100-LQFP","Product Status":"Not For New Designs","Data Converters":"A/D 3x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S2939","Program Memory Size":"256KB (256K 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":"$18.7872","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S2939-IQC50-A2/alternatives.json"},"ai":{"faq":[{"question":"Is LM3S2939-IQC50-A2 obsolete or NRND?","answer":"It remains available for existing production through independent distribution, but TI advises against starting new designs with this part."},{"question":"What is the replacement for LM3S2939-IQC50-A2?","answer":"The closest migration path is to a pin-compatible Stellaris or Tiva C Series MCU from TI in the same 100-LQFP package, such as the TM4C123 or TM4C129 family — verify the peripheral set and memory match your firmware requirements before swapping."},{"question":"What is the difference between LM3S2939 and LM3S2950?","answer":"The LM3S2950 is a higher-density sibling in the same Stellaris family. It typically offers more Flash and SRAM — the LM3S2939 has 256 KB Flash and 64 KB SRAM, while the LM3S2950 steps up to 256 KB Flash with 64 KB SRAM (same RAM) but adds a second CAN interface and a few more GPIO. Both share the 100-LQFP footprint and 50 MHz core, so a board-level swap is possible if the extra CAN port is needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S2939-IQC50-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/LM3S2939-IQC50-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}}