{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S1R21-IBZ80-C5T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S1R21-IBZ80-C5T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S1R21-IBZ80-C5T","factsUrl":"https://icboms.com/api/mcp/products/LM3S1R21-IBZ80-C5T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris® ARM® Cortex®-M3S 1000 microcontroller, LM3S1R21-IBZ80-C5T, 80 MHz, 256 KB flash, 48 KB RAM, 108-BGA, -40 to 85 °C.","salesMarkdown":"Texas Instruments has marked the LM3S1R21-IBZ80-C5T as Obsolete. No stock-holding claim — sourced per inquiry. The LM3S1R21-IBZ80-C5T runs an ARM Cortex-M3 core at 80 MHz — the 32-bit single-core pipeline delivers roughly 1.25 DMIPS/MHz, so the throughput ceiling sits around 100 DMIPS before flash wait-states cut in. The 256 KB on-chip flash (256K x 8) and 48 KB SRAM (48K x 8) leave room for a moderate application stack plus a real-time OS and protocol buffers. For a control-loop or protocol-stack task, the 80 MHz clock keeps the interrupt latency under 12 cycles from vector fetch to handler entry. ## Industrial temperature grade and peripheral set Rated for -40 to 85 °C ambient (TA), the device suits factory-floor controllers, outdoor telecom nodes, and engine-bay-adjacent enclosures where the ambient stays below the 85 °C ceiling. On-chip peripherals include brown-out detect, POR, PWM, WDT, and DMA; the connectivity block covers EBI/EMI, I²C, IrDA, LIN, Microwire, SPI, SSI, and UART/USART — enough to bridge to most fieldbus transceivers and serial sensors without glue logic. ## 108-BGA package — board integration and rework Rework requires a hot-air station with a preheat plate; the BGA sits on the board without an exposed thermal pad, so the decoupling cap placement under the BGA shadow matters more than the pad thermal relief. The 67 general-purpose I/O break out to the outer rows and inner balls — a 4-layer board with via-in-pad or dog-bone fan-out is the practical minimum for routing.","metaTitle":"TI LM3S1R21-IBZ80-C5T ARM Cortex-M3 MCU, 80 MHz","metaDescription":"Texas Instruments LM3S1R21-IBZ80-C5T Stellaris ARM Cortex-M3 MCU, 80 MHz, 256 KB flash, 48 KB RAM, 108-BGA.","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":"108-LFBGA","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":"108-BGA (10x10)","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-IBZ80-C5T/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the LM3S1R21-IBZ80-C5T and how do I get a price?","answer":"The part is obsolete and sourced through independent distribution. No stock-holding claim; lead time and lot traceability are provided per inquiry."},{"question":"What is the closest pin-compatible alternative to the LM3S1R21-IBZ80-C5T?","answer":"No official pin-compatible replacement or second-source is recorded from Texas Instruments or any other manufacturer. A functional replacement would require a board spin — the package, pinout, and peripheral set differ across Stellaris family variants."},{"question":"What is the LM3S1R21-IBZ80-C5T's listed speed?","answer":"The core runs at 80 MHz. The Cortex-M3 pipeline delivers roughly 1.25 DMIPS/MHz, so the practical throughput is about 100 DMIPS before flash wait-states limit instruction fetch."},{"question":"What compliance documentation does Texas Instruments provide for the LM3S1R21-IBZ80-C5T?","answer":"The record does not list RoHS, REACH, UL, or IEC certifications for this specific order code. Standard TI documentation (datasheet, PCN, EOL notice) is available from the manufacturer's archive. Compliance status should be confirmed at RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S1R21-IBZ80-C5T","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-IBZ80-C5T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:49:29.711Z","lastPublished":"2026-07-21T02:49:29.711Z","indexable":true}}