{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S1R21-IQC80-C5","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S1R21-IQC80-C5","canonicalUrl":"https://icboms.com/texas-instruments/LM3S1R21-IQC80-C5","factsUrl":"https://icboms.com/api/mcp/products/LM3S1R21-IQC80-C5","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris® ARM® Cortex®-M3S 1000 series, LM3S1R21-IQC80-C5, 32-Bit Single-Core MCU, 80MHz, 256KB Flash, 48K x 8 RAM, 67 I/O, 100-LQFP, -40°C~85°C.","salesMarkdown":"## 80 MHz core and 256 KB Flash — sizing the firmware and the loop The 80 MHz Cortex-M3 core delivers about 1.25 DMIPS/MHz, so you get roughly 100 DMIPS for control loops, sensor fusion, or protocol parsing. The 256 KB Flash is a comfortable fit for a bootloader plus a moderate application — think motor drive firmware with field-oriented control, or a multi-protocol gateway handling Modbus and CANopen. The 48 KB SRAM supports a few large buffers (e.g., two 1 KB Ethernet frames, a 4 KB display frame, and stack) without hitting swap. The 8-channel 10-bit ADC handles analog feedback from sensors or potentiometers without an external converter. No further factory orders are accepted; no last-time-buy window remains open. For production or repair, the part must be sourced through independent distribution — surplus inventory, broker channels, or open-market stock. ## Package and mounting — 100-LQFP hand-solderable It is a surface-mount device, so plan for a stencil if you are doing reflow in volume.","metaTitle":"LM3S1R21-IQC80-C5 Stellaris ARM Cortex-M3 MCU, 80 MHz","metaDescription":"LM3S1R21-IQC80-C5 is a 32-bit ARM Cortex-M3 MCU from the Stellaris series, 80 MHz core, 256 KB Flash, 48 KB SRAM, industrial temp range -40°C to 85°C.","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":"Tray","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-C5/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy LM3S1R21-IQC80-C5 and how do I get a price?","answer":"The LM3S1R21-IQC80-C5 is obsolete and no longer in factory production. We source it through independent distribution — surplus inventory and broker channels. Submit an RFQ for this part; we will confirm availability and current pricing at quote time. No stock or price figures are published here because the market moves daily for an obsolete part."},{"question":"Is LM3S1R21-IQC80-C5 obsolete and can it be used in a new design?","answer":"Yes, the LM3S1R21-IQC80-C5 is obsolete per Texas Instruments. It should not be used in a new design — there is no factory support, no last-time-buy window, and no guarantee of long-term supply. For a new project, look at current-production Stellaris or TM4C Cortex-M4 parts from TI that are pin-compatible and offer better performance and longer lifecycle."},{"question":"What is the replacement for LM3S1R21-IQC80-C5?","answer":"Texas Instruments has not published a direct pin-compatible replacement for the LM3S1R21-IQC80-C5. The Stellaris family evolved into the TM4C series (Cortex-M4F), which shares the same 100-LQFP footprint and peripheral set in many variants. For a specific cross-reference, compare the TM4C123 or TM4C129 parts against your firmware and peripheral requirements. We can help identify a suitable current-production alternate when you submit an RFQ."},{"question":"What is LM3S1R21-IQC80-C5's listed speed and memory?","answer":"The core runs at 80 MHz. Program memory is 256 KB of Flash, and SRAM is 48 KB. That combination is typical for a mid-range Cortex-M3 MCU handling control loops, communication stacks, and moderate data buffering."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S1R21-IQC80-C5","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-C5 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}}