{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S9B81-IQC80-C3","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S9B81-IQC80-C3","canonicalUrl":"https://icboms.com/texas-instruments/LM3S9B81-IQC80-C3","factsUrl":"https://icboms.com/api/mcp/products/LM3S9B81-IQC80-C3","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 9000 series LM3S9B81-IQC80-C3, 32-bit ARM Cortex-M3 MCU, 80 MHz, 256 KB Flash, 96 KB RAM, 65 I/O, Ethernet, USB OTG, CAN, 1.235V–1.365V core, -40°C to 85°C, 100-LQFP tray.","salesMarkdown":"## Stellaris LM3S9B81 — 80 MHz Cortex-M3 with Ethernet and CAN The LM3S9B81-IQC80-C3: This MCU was designed for networked industrial control, building automation, and gateway applications where wired connectivity is central. There is no official TI successor listed for this exact order code. For new designs, a pin-compatible alternative within the same family is not available from the original manufacturer. Buyers should verify date-code consistency and packaging condition when procuring from the surplus market. ## 80 MHz Cortex-M3 — what the core speed means The 80 MHz ARM Cortex-M3 core delivers a balance of throughput and power efficiency for real-time control and protocol processing. At this clock rate, the part can handle a TCP/IP stack, CAN message handling, and USB device/host operation without external protocol chips. The 96 KB SRAM provides enough buffer space for Ethernet frames and CAN message objects, while the 256 KB Flash accommodates a moderate application with a real-time OS. The core supply operates from 1.235 V to 1.365 V, which is a narrow range — the board-level regulator must be accurate to avoid brown-out resets. ## Peripheral set — Ethernet, USB OTG, CAN, and more The LM3S9B81 integrates a 10/100 Ethernet MAC with an integrated PHY, a USB OTG controller, and two CAN 2.0 controllers, making it suitable for industrial gateways, protocol converters, and networked sensor hubs. The 65 GPIOs are sufficient for driving a local display, keypad, and status LEDs alongside the communication interfaces. The part also includes a 16-channel 10-bit ADC, PWM outputs, and a watchdog timer. The device is housed in a 100-pin LQFP with a 14 mm × 14 mm body, suitable for standard reflow assembly.","metaTitle":"Texas Instruments LM3S9B81-IQC80-C3 ARM Cortex-M3 MCU","metaDescription":"Texas Instruments LM3S9B81-IQC80-C3 32-bit ARM Cortex-M3 MCU, 80 MHz, 256 KB Flash, 96 KB RAM, Ethernet, USB OTG, CAN, -40°C to 85°C, 100-LQFP.","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":"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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/44db7f5ad4ad2e4c19bcb9cdbd64a6f0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is the LM3S9B81-IQC80-C3 obsolete?","answer":"Yes, the LM3S9B81-IQC80-C3 is listed as obsolete. TI has discontinued the Stellaris family, and no direct replacement is available from the original manufacturer."},{"question":"What is the replacement for LM3S9B81-IQC80-C3?","answer":"There is no official TI replacement for the LM3S9B81-IQC80-C3. For a pin-compatible alternative, buyers should evaluate other Stellaris 9000 series parts with similar peripheral sets, but these are also discontinued. A migration to a current TI Cortex-M4 or M7 family (e.g., TM4C series) is recommended for new designs."},{"question":"Does the LM3S9B81-IQC80-C3 support Ethernet and CAN?","answer":"Yes, the LM3S9B81 integrates a 10/100 Ethernet MAC+PHY and two CAN 2.0 controllers, along with USB OTG and multiple serial interfaces."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S9B81-IQC80-C3","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-C3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}