{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S9B81-IQC80-C3T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S9B81-IQC80-C3T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S9B81-IQC80-C3T","factsUrl":"https://icboms.com/api/mcp/products/LM3S9B81-IQC80-C3T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 9000 series 32-bit MCU, LM3S9B81-IQC80-C3T, 80 MHz, 256 KB flash, 96 KB RAM, 100-LQFP, -40 to 85 °C, Tape & Reel.","salesMarkdown":"## 80 MHz Cortex-M3 with 256 KB flash — what the memory and speed mean for a control-loop design The LM3S9B81-IQC80-C3T: The LM3S9B81 runs the ARM Cortex-M3 core at 80 MHz, giving a throughput of roughly 100 MIPS from the flash — enough to service a CANopen stack, a TCP/IP lightweight stack, and a PID loop on a single interrupt priority without starving the scheduler. 256 KB of on-chip flash and 96 KB of SRAM mean the firmware image can hold a full Ethernet bootloader plus application code, with the SRAM buffering a 1.5 KB Ethernet frame several times over before DMA moves it to a peripheral buffer. ## Connectivity set — CAN, Ethernet, USB OTG, and five serial channels The part integrates CAN, Ethernet MAC+PHY, USB OTG, plus I²C, SPI, SSI, UART, IrDA, LIN, and Microwire — covering the fieldbus and debug interfaces needed for an industrial gateway or motor-drive control board without external bridge chips. The external bus interface (EBI/EMI) can expand memory or connect an FPGA, though the 100-LQFP limits the available address lines compared to a BGA package. ## Industrial temperature range and supply rails Rated for -40 to 85 °C ambient, the part suits enclosures without active cooling — a panel-mounted controller in a factory bay or an outdoor telecom pedestal stays within the operating envelope. The core supply is a tight 1.235-1.365 V, which means a dedicated LDO or switching regulator is required — the I/O bank runs separately from the core rail, so a single 3.3 V supply needs a downstream regulator for the Vcore domain.","metaTitle":"TI LM3S9B81-IQC80-C3T ARM Cortex-M3 MCU, 80 MHz","metaDescription":"Texas Instruments LM3S9B81-IQC80-C3T Stellaris ARM Cortex-M3 MCU, 80 MHz, 256 KB flash, 96 KB RAM, CAN/Ethernet/USB OTG, -40 to 85 °C.","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 9000","Package":"Tape & Reel (TR)","RAM Size":"96K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT","Connectivity":"CANbus, EBI/EMI, Ethernet, I²C, IrDA, LINbus, Microwire, SPI, SSI, UART/USART, USB OTG","Mounting Type":"Surface Mount","Number of I/O":"65","Core Processor":"ARM® Cortex®-M3","Package / Case":"100-LQFP","Product Status":"Obsolete","Data Converters":"A/D 16x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S9B81","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)":"1.235V ~ 1.365V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/44db7f5ad4ad2e4c19bcb9cdbd64a6f0.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S9B81-IQC80-C3T/alternatives.json"},"ai":{"faq":[{"question":"What is the LM3S9B81-IQC80-C3T's core speed and memory configuration?","answer":"The ARM Cortex-M3 core runs at 80 MHz with 256 KB of on-chip flash and 96 KB of SRAM. The flash is sufficient for a full Ethernet stack plus application code; the SRAM buffers multiple Ethernet frames before DMA transfer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S9B81-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/LM3S9B81-IQC80-C3T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:57:34.189Z","lastPublished":"2026-07-21T02:57:34.189Z","indexable":true}}