{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S5K31-IQC80-C5","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S5K31-IQC80-C5","canonicalUrl":"https://icboms.com/texas-instruments/LM3S5K31-IQC80-C5","factsUrl":"https://icboms.com/api/mcp/products/LM3S5K31-IQC80-C5","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 5000 series LM3S5K31-IQC80-C5, 32-Bit Single-Core MCU, 80MHz, 128KB FLASH, 24K x 8 RAM, CAN/I²C/IrDA/LIN/SPI/UART/USB, 67 I/O, 100-LQFP, -40°C~85°C, Tray.","salesMarkdown":"## 80 MHz Cortex-M3 with USB OTG and CAN — what this part was designed for The LM3S5K31-IQC80-C5: It integrates a rich peripheral set including USB OTG, CAN 2.0B, multiple UART/USART, SPI, I²C, and a 16-channel 10-bit ADC, making it suited for industrial control, motor drive, and automotive gateway applications that need a single-chip control and connectivity solution. This means TI no longer manufactures the part, and no last-time-buy window remains open. There is no official TI-recommended replacement listed for this specific variant; the Stellaris family was migrated to the Tiva C Series platform, but pin-compatibility and software migration require careful evaluation of the specific target part. If you are qualifying this MCU into a new design today, the obsolete status is a hard stop — you need to select a current-production alternative. ## Connectivity and peripherals — what the chip brings to the board The LM3S5K31 integrates a USB On-The-Go (OTG) controller with PHY, a CAN 2.0B controller, and multiple serial interfaces: UART/USART, I²C, SPI, SSI, and Microwire. It also includes a quadrature encoder interface (QEI) for motor position feedback, an IrDA module, and a LIN bus controller. The 16-channel 10-bit ADC samples at up to 1 Msps. For PWM generation, there is a dedicated PWM module plus a watchdog timer and a brown-out reset circuit. The DMA controller offloads peripheral-to-memory transfers without CPU intervention. This peripheral mix targets applications that need both human-interface connectivity (USB) and industrial fieldbus (CAN, LIN) on a single chip. ## 100-LQFP package — footprint and layout notes The 100-LQFP package is 14 mm × 14 mm with 67 GPIOs and a 1.08 V–1.32 V core supply.","metaTitle":"Texas Instruments LM3S5K31-IQC80-C5 ARM Cortex-M3 MCU, 80MHz","metaDescription":"Texas Instruments Stellaris LM3S5K31-IQC80-C5: 32-bit ARM Cortex-M3 at 80MHz, 128KB FLASH, 24KB SRAM, USB OTG/CAN/UART/SPI/I²C, 67 GPIOs, 100-LQFP, -40°C to","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 5000","Package":"Tray","RAM Size":"24K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, DMA, POR, PWM, WDT","Connectivity":"CANbus, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB","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 16x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S5K31","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)":"1.08V ~ 1.32V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/ced2e58921dfaf5da21dc5dff9cf3a05.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S5K31-IQC80-C5/alternatives.json"},"ai":{"faq":[{"question":"Is LM3S5K31-IQC80-C5 obsolete?","answer":"Yes, Texas Instruments lists the LM3S5K31-IQC80-C5 as Obsolete. The only sourcing channel is the independent surplus market."},{"question":"What is the replacement for LM3S5K31-IQC80-C5?","answer":"Texas Instruments does not list a direct pin-compatible replacement for the LM3S5K31-IQC80-C5. The Stellaris family was superseded by the Tiva™ C Series (TM4C123/129), but those parts have different pinouts and peripheral maps. A software and hardware migration is required — there is no drop-in substitute. For existing designs, we can source the original part through independent distribution against an RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S5K31-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/LM3S5K31-IQC80-C5 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}