{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S1B21-IBZ80-C3T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S1B21-IBZ80-C3T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S1B21-IBZ80-C3T","factsUrl":"https://icboms.com/api/mcp/products/LM3S1B21-IBZ80-C3T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 1000 series MCU, LM3S1B21-IBZ80-C3T, 80MHz, 256KB Flash, 96KB RAM, 108-BGA, -40°C to 85°C.","salesMarkdown":"## Obsolete — sourcing the BOM line Texas Instruments has marked the LM3S1B21-IBZ80-C3T as obsolete. The 80 MHz ARM Cortex-M3 core with 256 KB of on-chip flash and 96 KB of SRAM is the performance anchor for this BGA-packaged MCU. The 108-BGA (10x10 mm) footprint means a board spin is required for any alternative — there is no drop-in replacement. ## 80 MHz Cortex-M3 with 256 KB flash — what it means for fit The 32-bit ARM Cortex-M3 core runs at 80 MHz — this is the throughput ceiling for control-loop and protocol-stack execution. The 256 KB flash stores the application binary; with a typical HAL + RTOS footprint of 40–60 KB, roughly 196–216 KB remains for application code, enough for a moderate industrial or sensor-fusion firmware load. The 96 KB SRAM serves as data and stack memory. For a TCP/IP stack with a 2 KB MTU buffer pool, the RAM budget leaves ~80 KB for application variables and DMA buffers — sufficient for most single-protocol embedded designs. This covers factory-floor enclosures, outdoor telecom cabinets, and engine-bay-adjacent applications without active cooling. The MCU integrates EBI/EMI, I²C, IrDA, LINbus, Microwire, SPI, SSI, and UART/USART interfaces — enough for a mixed-protocol control board connecting to sensors, displays, and a fieldbus gateway. The 67 GPIOs handle parallel LCD buses, keypad matrices, and discrete I/O without external expanders. On-chip peripherals include brown-out detect, DMA, POR, PWM, and a watchdog timer. The 8-channel 10-bit ADC samples analog inputs for current-sense or potentiometer feedback without an external converter. The internal oscillator eliminates an external crystal for non-timing-critical applications. Housed in a 108-LFBGA (10x10 mm) package with surface-mount termination. The 0.80 mm ball pitch is standard for a 4-layer PCB fan-out — two-layer boards will struggle to route the inner balls. Tape and Reel packaging suits automated pick-and-place assembly.","metaTitle":"TI LM3S1B21-IBZ80-C3T ARM Cortex-M3 MCU, 80MHz, 256KB Flash","metaDescription":"Texas Instruments LM3S1B21-IBZ80-C3T Stellaris ARM Cortex-M3 MCU, 80MHz, 256KB Flash, 96KB 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":"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":"108-LFBGA","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":"108-BGA (10x10)","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-IBZ80-C3T?","answer":"The 108-BGA footprint is unique to this Stellaris series variant; any replacement would require a PCB layout change."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S1B21-IBZ80-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-IBZ80-C3T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:46:20.042Z","lastPublished":"2026-07-21T02:46:20.042Z","indexable":true}}