{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S5B91-IQC80-C3T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S5B91-IQC80-C3T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S5B91-IQC80-C3T","factsUrl":"https://icboms.com/api/mcp/products/LM3S5B91-IQC80-C3T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 5000 series MCU, LM3S5B91-IQC80-C3T, 32-bit single-core at 80MHz, 256KB Flash, 96K x 8 RAM, 72 I/O, CAN/USB OTG/SPI/I²C, 100-LQFP (14x14 mm), -40°C to 85°C.","salesMarkdown":"## What this Stellaris MCU actually does The operating temperature range spans -40°C to 85°C. Supply voltage is 1.08 V to 1.32 V. ## 80 MHz Cortex-M3 — what the speed buys you At 80 MHz, this core executes a single-cycle multiply and a two-cycle hardware divide. The DMA controller can move ADC results or UART data without stealing cycles from the CPU. The LM3S5B91-IQC80-C3T is officially obsolete (EOL). Texas Instruments has ended production; no last-time-buy window remains open. New units are available only through independent distribution and surplus channels. If your BOM line needs a production-run alternative, the Stellaris family includes pin-compatible siblings with similar memory and peripheral maps; we can help identify the closest fit for a redesign. ## Peripheral set for industrial control The 16-channel 10-bit ADC samples analog inputs from sensors or potentiometers without an external converter. The quadrature encoder interface (QEI) reads incremental encoder pulses directly — useful for motor position feedback. The PWM module with dead-band insertion drives a half-bridge or H-bridge with minimal software overhead. Brown-out detect and power-on reset are built in, so the MCU starts predictably on power-up and resets cleanly on a supply dip.","metaTitle":"LM3S5B91-IQC80-C3T Stellaris ARM Cortex-M3 MCU, 80MHz, 256KB Flash","metaDescription":"Texas Instruments LM3S5B91-IQC80-C3T Stellaris ARM Cortex-M3 MCU, 80MHz, 256KB Flash, 96KB RAM, industrial temp, 100-LQFP. Obsolete — sourced to order against RFQ.","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 16x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S5B91","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)":"1.08V ~ 1.32V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/a2b797d18d5d06d739b4d9059d4921cd.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S5B91-IQC80-C3T/alternatives.json"},"ai":{"faq":[{"question":"Is LM3S5B91-IQC80-C3T obsolete?","answer":"Yes, the LM3S5B91-IQC80-C3T is obsolete and no longer in production by Texas Instruments. It is available through surplus and independent distributor channels, sourced to order against an RFQ."},{"question":"What is the replacement for LM3S5B91-IQC80-C3T?","answer":"Texas Instruments has not published a direct pin-compatible replacement for this specific Stellaris 5000-series MCU. For a new design, consider a current-production ARM Cortex-M4 or M7 part from TI's TM4C series, which offers similar peripheral integration and a migration path. We can review your requirements and suggest a cross-reference for a BOM redesign."},{"question":"What is LM3S5B91-IQC80-C3T's listed speed?","answer":"The core runs at 80 MHz, which is the maximum clock for this Stellaris ARM Cortex-M3 device."},{"question":"What is the datasheet for LM3S5B91-IQC80-C3T?","answer":"The datasheet is available from Texas Instruments' archive for the Stellaris LM3S5B91. It covers the full electrical specifications, pinout, and application notes for this MCU."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S5B91-IQC80-C3T","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S5B91-IQC80-C3T 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}}