{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S1B21-IBZ80-C5T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S1B21-IBZ80-C5T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S1B21-IBZ80-C5T","factsUrl":"https://icboms.com/api/mcp/products/LM3S1B21-IBZ80-C5T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 1000 microcontroller, LM3S1B21-IBZ80-C5T, 80MHz, 256KB flash, 96KB SRAM, 108-BGA, -40 to 85°C.","salesMarkdown":"## 108-ball BGA — PCB layout and rework considerations The LM3S1B21-IBZ80-C5T: Housed in a 108-ball LFBGA (10x10 mm body), this MCU demands a multi-layer PCB for fan-out — the 0.50 mm ball pitch routes out to inner layers on a 4-layer board; two-layer designs will struggle to escape the inner rows without blind vias. ## Industrial temperature grade and peripheral set On-chip peripherals include an 8-channel 10-bit ADC, brown-out detect, DMA, PWM, and a watchdog timer — enough for a sensor-fusion node or a motor-control loop without external ADC or supervisor ICs. Connectivity covers EBI/EMI, I²C, SPI, SSI, UART/USART, IrDA, LIN, and Microwire — the EBI/EMI interface allows glueless connection to external SRAM or NOR flash if the on-chip 256 KB is insufficient. No pin-compatible direct replacement exists from TI — any functional substitute requires a board spin and firmware port.","metaTitle":"TI LM3S1B21-IBZ80-C5T Cortex-M3 MCU, 80MHz, 256KB Flash","metaDescription":"Texas Instruments LM3S1B21-IBZ80-C5T Stellaris ARM Cortex-M3 MCU, 80MHz, 256KB flash, 96KB SRAM, 108-BGA. 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":"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-C5T?","answer":"No pin-compatible direct replacement is documented from Texas Instruments. The Stellaris family includes other Cortex-M3 devices with similar peripheral sets, but package and pinout differ — a board redesign is required for any functional substitute."},{"question":"What is LM3S1B21-IBZ80-C5T's listed speed?","answer":"The core runs at 80 MHz — this is the maximum clock frequency for the ARM Cortex-M3 processor on this device."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S1B21-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/LM3S1B21-IBZ80-C5T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:46:34.156Z","lastPublished":"2026-07-21T02:46:34.156Z","indexable":true}}