{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S8971-IQC50-A2T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S8971-IQC50-A2T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S8971-IQC50-A2T","factsUrl":"https://icboms.com/api/mcp/products/LM3S8971-IQC50-A2T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris® ARM® Cortex®-M3S 8000 series LM3S8971-IQC50-A2T, 32-bit MCU, 50 MHz, 256KB Flash, 64K x 8 RAM, Ethernet & CAN, 38 I/O, 8x10b ADC, -40°C~85°C, 100-LQFP.","salesMarkdown":"It was built for industrial and building-control applications that need both Ethernet and CAN connectivity on a single chip — think programmable logic controllers, HVAC gateways, motor drives, and remote I/O nodes that talk over a factory network and a local sensor bus simultaneously. The part includes an 8-channel 10-bit ADC, PWM timers, a quadrature encoder interface, and multiple serial ports (UART, SPI, SSI, Microwire, IrDA), so it could handle sensor fusion, closed-loop motor control, and HMI communication without external interface ICs. The LM3S8971-IQC50-A2T is officially marked obsolete. Texas Instruments ended production on the Stellaris line after acquiring Luminary Micro and migrating designs to the Tiva C series. For a BOM that already carries this MCU, the only sourcing path is the independent distribution channel — new-old-stock, surplus inventory, or broker-sourced units. Any stock found today is what remains in the channel; no further factory orders are possible. ## 50 MHz Cortex-M3 — the performance tier and what it can handle The 50 MHz ARM Cortex-M3 core delivers about 1.25 DMIPS/MHz, so roughly 62.5 DMIPS peak. That is enough for a real-time control loop with Ethernet packet processing and CAN message handling running concurrently — think a motor drive that streams status over Modbus TCP while responding to CANopen position commands. The 38 GPIOs in the 100-pin LQFP package leave room for a parallel LCD interface or a bank of optocoupled digital inputs alongside the serial peripherals. ## Supply voltage and package — board-level constraints That means a dedicated 2.5 V rail or an LDO from 3.3 V is needed on the board — the I/O pins are not 5 V tolerant.","metaTitle":"LM3S8971-IQC50-A2T Stellaris ARM Cortex-M3 MCU, 50 MHz","metaDescription":"LM3S8971-IQC50-A2T Stellaris ARM Cortex-M3 MCU, 50 MHz, 256 KB Flash, 64 KB RAM, Ethernet+CAN, -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 8000","Package":"Tape & Reel (TR)","RAM Size":"64K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, POR, PWM, WDT","Connectivity":"CANbus, Ethernet, IrDA, Microwire, QEI, SPI, SSI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"38","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":"LM3S8971","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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cdd7bbe714582b2ae380b4c04ebf9f5c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy LM3S8971-IQC50-A2T available via RFQ confirmation?","answer":"The LM3S8971-IQC50-A2T is obsolete and no longer in factory production."},{"question":"Is LM3S8971-IQC50-A2T obsolete?","answer":"Yes, the LM3S8971-IQC50-A2T is officially obsolete. Texas Instruments discontinued the Stellaris line after acquiring Luminary Micro. No further factory orders are accepted; any procurement must go through surplus or broker inventory."},{"question":"What is the replacement for LM3S8971-IQC50-A2T?","answer":"There is no pin-compatible drop-in replacement from Texas Instruments. The Tiva C series (TM4C123x) is the architectural successor but uses a 3.3 V supply and a different pinout. A redesign with a TM4C123GH6PM or an equivalent Cortex-M4 part from STMicroelectronics (STM32F4 series) or NXP (LPC1768) would be needed. For keeping an existing board running, the only option is sourcing the original LM3S8971 from the surplus channel."},{"question":"What are the specifications of LM3S8971-IQC50-A2T?","answer":"It has 256 KB Flash, 64 KB SRAM, 38 GPIOs, an 8-channel 10-bit ADC, and integrated Ethernet MAC and CAN 2.0B controllers. Connectivity includes CANbus, Ethernet, IrDA, Microwire, QEI, SPI, SSI, and UART/USART."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S8971-IQC50-A2T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S8971-IQC50-A2T 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}}