{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM3S1133-IBZ50-A2T","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM3S1133-IBZ50-A2T","canonicalUrl":"https://icboms.com/texas-instruments/LM3S1133-IBZ50-A2T","factsUrl":"https://icboms.com/api/mcp/products/LM3S1133-IBZ50-A2T","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments Stellaris ARM Cortex-M3S 1000 series LM3S1133-IBZ50-A2T, 32-bit single-core MCU, 50MHz, 64KB Flash, 16KB RAM, 44 I/O, 108-LFBGA, -40°C to 85°C, NRND.","salesMarkdown":"## Cortex-M3 at 50 MHz — throughput and memory budget The LM3S1133-IBZ50-A2T is a Texas Instruments Stellaris ARM Cortex-M3S 1000 series MCU built around a 32-bit ARM Cortex-M3 core clocked at 50 MHz. This puts it in the mid-range of Cortex-M3 parts — fast enough for real-time control loops, sensor fusion, and protocol bridging (TCP/IP offload, Modbus, CAN gateway) without the power penalty of a Cortex-M4 or M7. On-chip memory is 64 KB of Flash and 16 KB of SRAM. The Flash holds the firmware image and constant data; the SRAM budget of 16 KB covers stack, heap, and DMA buffers. For a typical industrial application running a bare-metal scheduler or a lightweight RTOS, this leaves roughly 4–6 KB of free RAM after the kernel and protocol stacks are loaded — enough for a few hundred bytes of sensor data or a small display frame buffer. ## NRND status — what it means for procurement Texas Instruments lists this part as NRND (Not Recommended for New Designs). For existing designs already qualified on this MCU, the NRND flag means you should plan a migration to a pin-compatible or functionally equivalent successor before the EOL notice triggers a forced last-time-buy. The base product number LM3S1133 suggests a family of parts with varying memory and package options; a cross-reference to a sibling in the same Stellaris family would require matching the 108-BGA footprint, supply voltage, and peripheral set. ## Package and board integration — 108-LFBGA The MCU comes in a 108-ball LFBGA (Low-profile Fine-pitch Ball Grid Array) measuring 10x10 mm. The 0.80 mm ball pitch is standard for this class of BGA — it routes out on a 4-layer board without micro-vias, but the inner balls require via-in-pad or dog-bone fan-out. The supplier device package code is 108-BGA (10x10), which matches the physical footprint. This covers most factory-floor, outdoor enclosure, and HVAC applications. The supply voltage is a single narrow rail at 2.25 V to 2.75 V — no separate core and I/O voltages, which simplifies the power tree but means all 44 GPIOs swing at the same 2.5 V nominal level. On-chip peripherals include brown-out detect, power-on reset, PWM outputs, and a watchdog timer — these handle supervisory functions without external reset ICs or voltage monitors. The PWM module can drive small motors, LEDs, or solenoid valves directly through a transistor buffer. Serial connectivity covers I²C, SPI, SSI, UART/USART, IrDA, and Microwire. This is a broad set for a mid-range MCU: I²C for sensor buses and EEPROMs, SPI for displays or ADCs, UART for RS-232/RS-485 transceivers, and SSI for synchronous serial interfaces like audio codecs. The Microwire and IrDA support are legacy but useful for retrofitting older equipment. A 2-channel 10-bit ADC is integrated — sufficient for reading potentiometers, thermistors, or current-sense resistors. No DAC is present, so analog output requires an external converter or PWM-with-filter. ## Sourcing reality for the NRND part Because the LM3S1133-IBZ50-A2T carries an NRND status, it is not flowing through standard authorized distribution channels for new orders. Sourcing is through independent surplus and broker inventory — quantities are lot-specific and confirmed at RFQ time. The part is supplied in Tape & Reel packaging (TR suffix), which is the standard for automated pick-and-place assembly. No compliance documentation (RoHS, REACH, UL, IEC) is listed in the available records. Texas Instruments typically provides RoHS and REACH declarations for active parts, but for an NRND device the compliance status should be verified against the specific date code lot at the time of ordering.","metaTitle":"Texas Instruments LM3S1133-IBZ50-A2T Cortex-M3 MCU, 50MHz","metaDescription":"Texas Instruments Stellaris LM3S1133-IBZ50-A2T ARM Cortex-M3 MCU, 50MHz, 64KB Flash, 16KB RAM, 44 I/O, 108-LFBGA, -40°C to 85°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Speed":"50MHz","title":"LM3S1133-IBZ50-A2T","Series":"Stellaris® ARM® Cortex®-M3S 1000","Package":"Tape & Reel (TR)","RAM Size":"16K x 8","Core Size":"32-Bit Single-Core","Peripherals":"Brown-out Detect/Reset, POR, PWM, WDT","Connectivity":"I²C, IrDA, Microwire, SPI, SSI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"44","Core Processor":"ARM® Cortex®-M3","Package / Case":"108-LFBGA","Data Converters":"A/D 2x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"LM3S1133","Program Memory Size":"64KB (64K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"108-BGA (10x10)","Voltage - Supply (Vcc/Vdd)":"2.25V ~ 2.75V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$15.9281","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM3S1133-IBZ50-A2T/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to LM3S1133-IBZ50-A2T?","answer":"No official successor or pin-compatible replacement is listed in the lifecycle record. The base product number LM3S1133 belongs to the Stellaris family, and a sibling with the same 108-BGA footprint and supply voltage may exist, but without a documented cross-reference, a board spin or software port should be expected for any migration."},{"question":"What is the speed rating of LM3S1133-IBZ50-A2T?","answer":"The ARM Cortex-M3 core runs at 50 MHz. This is the maximum clock frequency; actual throughput depends on Flash wait states and the instruction mix."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM3S1133-IBZ50-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/LM3S1133-IBZ50-A2T when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T02:40:10.664Z","lastPublished":"2026-07-21T02:40:10.664Z","indexable":true}}