{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S1B21-IQC80-C5T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S1B21-IQC80-C5T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S1B21-IQC80-C5T","factsUrl":"https://icboms.com/api/mcp/products/LM3S1B21-IQC80-C5T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 1000 series, LM3S1B21-IQC80-C5T, 32-bit MCU, 80 MHz, 256 KB Flash, 96 KB RAM, 100-LQFP.","salesMarkdown":"## Core and memory headroom for control applications The LM3S1B21-IQC80-C5T: On-chip memory pairs 256 KB of flash with 96 KB of SRAM — enough to run a real-time control loop with a moderate data buffer without external memory. The 80 MHz core delivers roughly 1.25 DMIPS/MHz, so the effective throughput is about 100 DMIPS — sufficient for motor control, industrial protocol bridging, or human-machine interface processing. 67 general-purpose I/O pins are available, along with an external bus interface (EBI/EMI) that can connect to parallel LCDs, FPGAs, or external memory. Serial connectivity covers I²C, SPI, SSI, UART/USART, LIN, IrDA, and Microwire — enough to talk to sensors, displays, and fieldbus transceivers on one chip. An 8-channel 10-bit ADC is integrated for analog signal acquisition. On-chip peripherals include a PWM generator, watchdog timer, DMA controller, and brown-out reset — the usual set for a standalone control MCU without external supervisor ICs. Texas Instruments has marked the LM3S1B21-IQC80-C5T as obsolete. For existing designs that cannot spin a board, sourcing through independent distribution is the only path. A BOM review to identify a functional replacement in a different package or pinout may be the longer-term solution.","metaTitle":"LM3S1B21-IQC80-C5T ARM Cortex-M3 MCU, 80 MHz, 256 KB Flash","metaDescription":"Texas Instruments LM3S1B21-IQC80-C5T Stellaris ARM Cortex-M3 MCU, 80 MHz, 256 KB Flash, 96 KB 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":"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":"$7.4800","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/5a682c061d806b177dc245e9bb945319.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S1B21-IQC80-C5T/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy LM3S1B21-IQC80-C5T?","answer":"This part is sourced to order through independent distribution. Submit an RFQ for a lot-specific offer."},{"question":"What is the closest pin-compatible alternative to LM3S1B21-IQC80-C5T?","answer":"The Stellaris family has been superseded by the Tiva C series, but those parts use different pinouts and peripherals — a board spin is required for migration."},{"question":"What is the listed speed of LM3S1B21-IQC80-C5T?","answer":"The core runs at 80 MHz. This is the nominal operating frequency for the ARM Cortex-M3 core on this device."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S1B21-IQC80-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-IQC80-C5T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:46:36.183Z","lastPublished":"2026-07-21T02:46:36.183Z","indexable":true}}