{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S1G21-IQC80-A2","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S1G21-IQC80-A2","canonicalUrl":"https://icboms.com/texas-instruments/LM3S1G21-IQC80-A2","factsUrl":"https://icboms.com/api/mcp/products/LM3S1G21-IQC80-A2","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 1000 microcontroller, LM3S1G21-IQC80-A2, 32-bit single-core, 80MHz, 384KB Flash, 64KB RAM, 100-LQFP tray.","salesMarkdown":"## Cortex-M3 at 80 MHz — flash and RAM headroom for control applications The LM3S1G21-IQC80-A2 is a Texas Instruments Stellaris ARM Cortex-M3S 1000 series microcontroller built around a 32-bit ARM Cortex-M3 core clocked at 80 MHz. The 80 MHz clock rate on the Cortex-M3 delivers roughly 1.25 DMIPS/MHz, so the core throughput sits around 100 DMIPS — enough to handle a PID loop at several kilohertz while servicing UART and SPI interrupts without dropping characters. The 64 KB SRAM leaves about 40 KB free after a typical RTOS and HAL footprint, which is comfortable for a moderate data buffer or a small frame grab. The peripheral mix includes EBI/EMI for external memory or FPGA glue, plus I²C, SPI, SSI, UART/USART, IrDA, LINbus, and Microwire serial interfaces — enough to talk to a CAN transceiver, an external ADC, a display controller, and a few sensors without needing a CPLD for port expansion. On-chip analog is an 8-channel, 12-bit ADC — useful for reading potentiometer feedback, current-sense resistors, or thermistor inputs in a control loop. The internal oscillator saves a crystal on the BOM, though the accuracy is adequate for UART timing but not for a precision time base. Additional on-chip blocks include brown-out detect, POR, DMA, PWM, and a watchdog timer. The DMA engine can move ADC results to RAM without CPU intervention, which keeps the core free for the control algorithm. Board assembly requires a controlled solder profile — the fine pitch means the stencil aperture and paste volume need to be dialled in for consistent solder joints. The package body is 14x14 mm, so it fits on a standard 4-layer PCB with fan-out vias under the body. Texas Instruments lists the LM3S1G21-IQC80-A2 as Obsolete. The Stellaris family was acquired by TI in the Luminary Micro acquisition and has been superseded by the Tiva C series and later Cortex-M4F parts. We source it to order against an RFQ — quantities are lot-specific, and we confirm authenticity, date code, and condition at quote time. If you have a BOM line that still calls out this order code, we can quote it; if you are starting a new design, this is not the part to build into a new board.","metaTitle":"Texas Instruments LM3S1G21-IQC80-A2 Cortex-M3 MCU, 80MHz","metaDescription":"Texas Instruments LM3S1G21-IQC80-A2 Stellaris ARM Cortex-M3 MCU, 80MHz, 384KB Flash, 64KB RAM, 100-LQFP. Obsolete — sourced to order against RFQ.","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":"64K 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 8x12b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S1G21","Program Memory Size":"384KB (384K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"100-LQFP (14x14)","Voltage - Supply (Vcc/Vdd)":"1.235V ~ 1.365V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/acebf1361b416656bd85e8d37228c41b.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the LM3S1G21-IQC80-A2?","answer":"There is no official pin-compatible successor from Texas Instruments. The Stellaris family was replaced by the Tiva C series (TM4C123/129), which uses a Cortex-M4F core and a different pinout. A board redesign is required to migrate. For a like-for-like drop-in, the only option is sourcing the original part through independent channels."},{"question":"What is the LM3S1G21-IQC80-A2's core speed and memory configuration?","answer":"The ARM Cortex-M3 core runs at 80 MHz. On-chip memory is 384 KB of Flash and 64 KB of SRAM (organized as 64K x 8). This is enough for a real-time control application with a moderate protocol stack."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S1G21-IQC80-A2","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S1G21-IQC80-A2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:48:00.075Z","lastPublished":"2026-07-21T02:48:00.075Z","indexable":true}}