{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S1R21-IQC80-C3T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S1R21-IQC80-C3T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S1R21-IQC80-C3T","factsUrl":"https://icboms.com/api/mcp/products/LM3S1R21-IQC80-C3T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 1000 series 32-bit MCU, LM3S1R21-IQC80-C3T, 80MHz, 256KB Flash, 48K x 8 RAM, 100-LQFP, -40°C to 85°C.","salesMarkdown":"Texas Instruments has designated the LM3S1R21-IQC80-C3T as obsolete. No official successor or pin-compatible replacement is recorded in the manufacturer's lifecycle documentation. ## 80 MHz Cortex-M3 with 256 KB Flash The ARM Cortex-M3 core runs at 80 MHz, placing it in the mid-range of the Stellaris 1000 series for throughput. The 256 KB on-chip flash and 48 K x 8 SRAM provide enough headroom for a real-time control stack with moderate data logging — the flash holds the application and bootloader, while the SRAM covers the stack and heap for a typical RTOS deployment. Connectivity includes EBI/EMI, I²C, IrDA, LINbus, Microwire, SPI, SSI, and UART/USART — a broad set for industrial fieldbus bridging or sensor aggregation. The 67 I/O lines in the 100-LQFP package give the layout engineer flexibility to route peripheral signals without forcing a larger package. Peripherals include brown-out detect, POR, PWM, WDT, and DMA — the watchdog and brown-out reset are essential for unattended equipment that must recover from a supply glitch without a manual power cycle. The 8-channel 10-bit ADC covers analog feedback from sensors or potentiometers.","metaTitle":"LM3S1R21-IQC80-C3T Texas Instruments MCU, 80MHz, 256KB Flash","metaDescription":"Texas Instruments LM3S1R21-IQC80-C3T ARM Cortex-M3 MCU, 80MHz, 256KB Flash, 48K RAM, 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":"80MHz","Series":"Stellaris® ARM® Cortex®-M3S 1000","Package":"Tape & Reel (TR)","RAM Size":"48K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, DMA, POR, PWM, WDT","Connectivity":"EBI/EMI, I²C, IrDA, LINbus, Microwire, SPI, SSI, UART/USART","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 8x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S1R21","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)":"1.08V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/680b67575fde816bac5358fa43a3c9cf.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S1R21-IQC80-C3T/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the LM3S1R21-IQC80-C3T?","answer":"No pin-compatible alternative is recorded in the manufacturer's lifecycle documentation. The Stellaris family shares the Cortex-M3 core and 100-LQFP footprint, but each order code has a unique peripheral and memory configuration — a direct drop-in replacement without firmware changes is not confirmed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S1R21-IQC80-C3T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S1R21-IQC80-C3T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:49:25.553Z","lastPublished":"2026-07-21T02:49:25.553Z","indexable":true}}