{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S5D91-IQC80-A2T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S5D91-IQC80-A2T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S5D91-IQC80-A2T","factsUrl":"https://icboms.com/api/mcp/products/LM3S5D91-IQC80-A2T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 5000 series 32-bit MCU, LM3S5D91-IQC80-A2T, 80 MHz, 512 KB Flash, 96 KB RAM, CANbus, USB OTG, 100-LQFP, -40 to 85°C.","salesMarkdown":"## What this Stellaris MCU brings to the board The LM3S5D91-IQC80-A2T is a 32-bit ARM Cortex-M3 microcontroller from the Stellaris 5000 series, clocked at 80 MHz. It has 512 KB Flash and 96 KB RAM. ## 512 KB Flash — firmware fit and field updates The Flash is programmable in-system, so field updates are possible over the USB or CAN link. No EEPROM on-chip; if you need non-volatile parameter storage, budget a few Flash pages for emulated EEPROM or add an external serial EEPROM. ## Connectivity and I/O lineup This MCU includes CANbus, USB OTG, and serial interfaces (UART, SPI, I²C, SSI, Microwire, IrDA, LIN). The 72 GPIOs can drive a keypad-and-LED panel plus a parallel bus. The LM3S5D91-IQC80-A2T is officially obsolete per the manufacturer. No last-time-buy window remains open. There is no direct pin-compatible drop-in from TI's current portfolio; the Stellaris line was absorbed into the Tiva C series, but those parts differ in peripheral map and require firmware porting. If you need a drop-in second source, check the LM3S5D91's siblings in the same 100-LQFP package — the base part number LM3S5D91 covers multiple speed and temperature grades, but all are now obsolete.","metaTitle":"LM3S5D91-IQC80-A2T Stellaris ARM Cortex-M3 MCU, 80 MHz, 512 KB Flash","metaDescription":"LM3S5D91-IQC80-A2T Stellaris ARM Cortex-M3 MCU: 80 MHz core, 512 KB Flash, 96 KB RAM, CAN/USB OTG, industrial temp -40 to 85°C. Obsolete; sourced to order.","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":"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, I²C, IrDA, LINbus, Microwire, QEI, SPI, SSI, UART/USART, USB OTG","Mounting Type":"Surface Mount","Number of I/O":"72","Core Processor":"ARM® Cortex®-M3","Package / Case":"100-LQFP","Product Status":"Obsolete","Data Converters":"A/D 16x12b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S5D91","Program Memory Size":"512KB (512K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"100-LQFP (14x14)","Voltage - Supply (Vcc/Vdd)":"3V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S5D91-IQC80-A2T/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to LM3S5D91-IQC80-A2T?","answer":"There is no direct pin-compatible replacement from TI's current portfolio. The Tiva C series (e.g., TM4C123) is the architectural successor but differs in peripheral map and requires firmware porting. Siblings within the LM3S5D91 base part number (different speed/temp grades) share the same 100-LQFP footprint but are also obsolete."},{"question":"What is LM3S5D91-IQC80-A2T's listed speed?","answer":"The core runs at 80 MHz."},{"question":"What series is LM3S5D91-IQC80-A2T from?","answer":"It is part of the Stellaris ARM Cortex-M3S 5000 series from Texas Instruments."},{"question":"What compliance documentation does TI provide for LM3S5D91-IQC80-A2T?","answer":"The part is RoHS compliant as standard for TI's commercial offerings. Specific REACH and conflict minerals declarations are available from TI's compliance portal for the base part number LM3S5D91."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S5D91-IQC80-A2T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S5D91-IQC80-A2T 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}}