{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S1538-EQC50-A2","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S1538-EQC50-A2","canonicalUrl":"https://icboms.com/texas-instruments/LM3S1538-EQC50-A2","factsUrl":"https://icboms.com/api/mcp/products/LM3S1538-EQC50-A2","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris® ARM® Cortex®-M3S 1000 series microcontroller, LM3S1538-EQC50-A2, 32-bit single-core, 50MHz, 96KB Flash, 64KB RAM, 100-LQFP, -40°C to +105°C.","salesMarkdown":"## Cortex-M3 core at 50 MHz with on-chip memory budget The LM3S1538-EQC50-A2: That clock rate, combined with the single-cycle multiply and hardware divide in the Cortex-M3 pipeline, delivers deterministic interrupt response for time-constrained control loops. On-chip memory totals 96 KB of Flash for program storage and 64 KB of SRAM for data — a 1.5:1 Flash-to-RAM ratio that suits firmware with moderate lookup tables or buffering. The 64 KB SRAM is mapped as 64K x 8, giving the linker a contiguous data space without banking. Operating temperature spans -40°C to +105°C, which qualifies the part for industrial enclosures, motor-drive compartments, and outdoor telecom cabinets where ambient heat rises above the commercial 85°C ceiling. The MCU integrates 43 general-purpose I/O lines and a peripheral set that includes I²C, SPI, SSI, UART/USART, IrDA, Microwire, and QEI (quadrature encoder interface). The QEI block directly decodes incremental encoder pulses for motor position feedback without bit-banging the timer. On-chip analog conversion is handled by an 8-channel, 10-bit ADC — sufficient for monitoring analog sensors or current-sense resistors in a single-ended configuration. Supervisory functions include brown-out detect, power-on reset, a watchdog timer, and a PWM module — the brown-out reset holds the core in reset until the supply rail stabilises above the threshold, preventing code execution during a sag. ## Package, supply, and board-fit constraints Housed in a 100-pin LQFP with a 14x14 mm body (0.50 mm pitch), the LM3S1538-EQC50-A2 requires a 4-layer PCB for reliable fan-out of the inner rows. The 100-LQFP footprint is shared across several Stellaris 1000-series devices, so a single PCB layout can accommodate multiple Flash/RAM variants by populating the matching BOM line — useful for a product family with tiered firmware requirements. Texas Instruments has marked the LM3S1538-EQC50-A2 as obsolete.","metaTitle":"TI LM3S1538-EQC50-A2 ARM Cortex-M3 MCU, 50MHz, 96KB Flash","metaDescription":"Texas Instruments LM3S1538-EQC50-A2 Stellaris ARM Cortex-M3 MCU, 50MHz, 96KB Flash, 64KB RAM, -40 to +105°C. 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":"50MHz","Series":"Stellaris® ARM® Cortex®-M3S 1000","Package":"Tray","RAM Size":"64K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, POR, PWM, WDT","Connectivity":"I²C, IrDA, Microwire, QEI, SPI, SSI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"43","Core Processor":"ARM® Cortex®-M3","Package / Case":"100-LQFP","Product Status":"Obsolete","Data Converters":"A/D 8x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S1538","Program Memory Size":"96KB (96K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~105°C(TA)","Supplier Device Package":"100-LQFP (14x14)","Voltage - Supply (Vcc/Vdd)":"2.25V ~ 2.75V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b26997997ffc52a8b9d6c51230a8bbb0.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the LM3S1538-EQC50-A2?","answer":"The Stellaris 1000 series shares the 100-LQFP footprint and 2.5 V supply across multiple Flash/RAM variants, but a direct drop-in replacement from TI is not documented. A board-level qualification is required for any alternative."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S1538-EQC50-A2","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM3S1538-EQC50-A2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:42:22.793Z","lastPublished":"2026-07-21T02:42:22.793Z","indexable":true}}