{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S9781-IQC80-C5","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S9781-IQC80-C5","canonicalUrl":"https://icboms.com/texas-instruments/LM3S9781-IQC80-C5","factsUrl":"https://icboms.com/api/mcp/products/LM3S9781-IQC80-C5","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris® ARM® Cortex®-M3S 9000 series, LM3S9781-IQC80-C5, 32-bit single-core MCU, 80MHz, 128KB Flash, 64K x 8 SRAM, 65 I/O, CANbus/Ethernet/USB OTG, 100-LQFP (14x14), -40°C to 85°C.","salesMarkdown":"The 80 MHz ARM Cortex-M3 core, combined with the DMA controller and the 64 KB SRAM, can sustain a full Ethernet TCP/IP stack alongside a CANopen master node without dropping frames. That matters for a panel controller that must forward Modbus TCP requests to a dozen drives on a CAN bus — the core has enough headroom to run FreeRTOS or a bare-metal scheduler handling the two protocol stacks without a second MCU. ## 128 KB Flash — firmware update constraint 128 KB of Flash limits the firmware image after the bootloader and vector table. That is adequate for a fixed-function gateway with a pre-compiled protocol stack.","metaTitle":"LM3S9781-IQC80-C5 Stellaris ARM Cortex-M3 MCU, 80MHz, 128KB Flash, 100-LQFP","metaDescription":"Obsolete LM3S9781-IQC80-C5 from TI Stellaris series. 32-bit ARM Cortex-M3 at 80MHz, 128KB Flash, 64KB SRAM, Ethernet+CAN+USB OTG. Sourced to order against RFQ through independent d","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":"Tray","RAM Size":"64K 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":"LM3S9781","Program Memory Size":"128KB (128K 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/aa8e08acec168565ddfe0ed524320717.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S9781-IQC80-C5/alternatives.json"},"ai":{"faq":[{"question":"Is LM3S9781-IQC80-C5 obsolete?","answer":"Yes, the LM3S9781-IQC80-C5 is obsolete per TI's lifecycle record. No factory production remains; the part is only available through independent distribution as surplus or new-old-stock inventory."},{"question":"What is the replacement for LM3S9781-IQC80-C5?","answer":"No official replacement part number is listed by TI for the LM3S9781-IQC80-C5. For a pin-compatible drop-in, you would need to evaluate other Stellaris 9000-series devices with the same 100-LQFP footprint and supply voltage, but no direct successor is documented. The independent channel is the only source for this exact order code."},{"question":"Where to buy LM3S9781-IQC80-C5?","answer":"The LM3S9781-IQC80-C5 is sourced to order through independent distribution. Submit an RFQ to confirm current availability and pricing; each lot is quoted individually based on inventory on hand."},{"question":"What is LM3S9781-IQC80-C5's listed speed?","answer":"The core is rated for 80 MHz operation. That is the maximum clock for the ARM Cortex-M3 core on this device."},{"question":"What is the pinout of LM3S9781-IQC80-C5?","answer":"The pinout is defined in the TI datasheet for the 100-LQFP package. The 100 pins include 65 GPIOs multiplexed with the peripheral functions (Ethernet, CAN, USB, UART, SPI, I²C, etc.). Download the official datasheet PDF for the full pin assignment table."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S9781-IQC80-C5","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S9781-IQC80-C5 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}