{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S9B81-IQC80-C5T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S9B81-IQC80-C5T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S9B81-IQC80-C5T","factsUrl":"https://icboms.com/api/mcp/products/LM3S9B81-IQC80-C5T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM3S9B81-IQC80-C5T, Stellaris ARM Cortex-M3S 9000 series, 80MHz 32-bit single-core, 256KB Flash / 96KB SRAM, 65 I/O, 100-LQFP (14×14mm) Tape & Reel, -40°C to 85°C operating temperature, 1.235V–1.365V supply.","salesMarkdown":null,"metaTitle":"TI LM3S9B81-IQC80-C5T — 80MHz Stellaris Cortex-M3 MCU, 256KB Flash, Dual CAN, Et","metaDescription":"Texas Instruments LM3S9B81-IQC80-C5T: ARM Cortex-M3 at 80MHz, 256KB Flash, 96KB SRAM, 65 I/O, Dual CAN + Ethernet + USB OTG, 100-LQFP, -40 to 85°C. Obsolete.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Speed":"80MHz","title":"LM3S9B81-IQC80-C5T","Series":"Stellaris® ARM® Cortex®-M3S 9000","Package":"Tape & Reel (TR)","RAM Size":"96K x 8","Core Size":"32-Bit Single-Core","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","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/c3a792b175253b13fb798007e44fe44c.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S9B81-IQC80-C5T/alternatives.json"},"ai":{"faq":[{"question":"What replaces the LM3S9B81-IQC80-C5T?","answer":"There is no pin-compatible drop-in replacement within the Stellaris family. The official migration path is to TI's Tiva C Series TM4C family — firmware rework is required, and TI published a Stellaris-to-Tiva migration guide covering register-level and driver-library differences. The base product number LM3S9B81 is the Stellaris identifier, distinct from any TM4C order code."},{"question":"Can the dual CAN modules run at different bit rates simultaneously?","answer":"Yes. Each CAN module has its own independent bit timing register, so CAN1 and CAN2 can operate at different baud rates on the same die without port sharing. Note that the LM3S9B81 does not support CAN-FD — if CAN-FD is required, a Tiva TM4C part is needed instead."},{"question":"Does the integrated Ethernet PHY need external magnetics, and what isolation rating is needed for an industrial Profinet IO module?","answer":"External magnetics are required — the PHY is integrated but the 10/100 interface needs a standard magnetics module. For a plant-floor Profinet IO module at 85°C ambient, a magnetics isolation rating of 1500V AC or 2250V DC is typical under IEC 61010 or IEC 61131-2 installation categories. The specific class depends on your product's certification target."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S9B81-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/LM3S9B81-IQC80-C5T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}