{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S1B21-IQC80-C3T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S1B21-IQC80-C3T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S1B21-IQC80-C3T","factsUrl":"https://icboms.com/api/mcp/products/LM3S1B21-IQC80-C3T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris® ARM® Cortex®-M3S 1000 series microcontroller, LM3S1B21-IQC80-C3T, 32-bit single-core, 80MHz, 256KB Flash, 96KB RAM, 100-LQFP, -40°C to 85°C.","salesMarkdown":"## Core architecture and memory — what fits on the BOM The LM3S1B21-IQC80-C3T: That clock rate, combined with the single-cycle multiply and hardware divide of the Cortex-M3, gives it enough throughput for real-time control loops — motor commutation or sensor fusion — without needing an external DSP. On-chip memory: 256 KB of Flash and 96 KB of SRAM. The Flash is enough for a moderate application stack plus a bootloader; the 96 KB SRAM leaves room for multiple frame buffers or a real-time OS heap without external memory. The 8-channel 10-bit ADC samples analog inputs directly — no external ADC needed for basic sensor readback. ## Package and board-fit — 100-LQFP Housed in a 100-pin LQFP (14x14 mm body, 0.5 mm pitch). The 67 GPIOs break out across three sides, leaving the fourth for the power/ground ring. The 0.5 mm pitch demands a 4-layer board for clean fan-out — two-layer designs will struggle to route all signals without vias under the package. The internal oscillator eliminates the external crystal for most applications, though the EBI/EMI interface may need an external clock for synchronous memory. ## Connectivity and peripherals — what the on-chip set covers The connectivity block includes I²C, SPI, SSI, UART/USART, IrDA, LIN, and Microwire — enough to talk to most sensors, displays, and motor drives without external protocol converters. The EBI/EMI interface allows direct connection to external parallel SRAM or NOR Flash if the on-chip 256 KB is insufficient. On-chip peripherals: brown-out detect, POR, DMA, PWM, and a watchdog timer. The PWM channels can drive a three-phase inverter directly; the DMA offloads data movement from the CPU, keeping the 80 MHz core free for control math. ## Lifecycle reality — obsolete, sourced to order Texas Instruments has marked the LM3S1B21-IQC80-C3T as Obsolete. No stock-holding claim; each order is sourced per the BOM line.","metaTitle":"LM3S1B21-IQC80-C3T Texas Instruments ARM Cortex-M3 MCU","metaDescription":"Texas Instruments LM3S1B21-IQC80-C3T ARM Cortex-M3 MCU, 80MHz, 256KB Flash, 96KB 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":"96K 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":"LM3S1B21","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/5a682c061d806b177dc245e9bb945319.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to LM3S1B21-IQC80-C3T?","answer":"The Stellaris® 1000 series has been superseded by later Cortex-M families, but those are not drop-in replacements — a board spin and software migration are required. For existing BOMs, the part is sourced through independent channels."},{"question":"What compliance documentation does Texas Instruments provide for LM3S1B21-IQC80-C3T?","answer":"The part carries RoHS compliance by default for TI's LQFP packages. The base product number is LM3S1B21; TI's standard documentation (datasheet, PCN history) is available through their website."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S1B21-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/LM3S1B21-IQC80-C3T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:46:35.494Z","lastPublished":"2026-07-21T02:46:35.494Z","indexable":true}}