{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L031K4U6TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L031K4U6TR","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L031K4U6TR","factsUrl":"https://icboms.com/api/mcp/products/STM32L031K4U6TR","rawCanonicalId":null},"summary":{"shortDescription":"ST STM32L0 series, ARM Cortex-M0+ 32-bit MCU, 32 MHz, 16 KB Flash, 8 KB RAM, 1 KB EEPROM, 27 I/O, -40 to 85°C, 32-UFQFPN (5x5), Tape & Reel.","salesMarkdown":"Typical applications include battery-operated sensors, portable instrumentation, and low-power control nodes where energy efficiency and a small footprint matter. The 32 MHz Cortex-M0+ core is the entry-level speed tier for the STM32L0 family. It handles periodic sensor reads, simple control loops, and serial communication. ## Memory budget — 16 KB Flash, 8 KB RAM, 1 KB EEPROM 16 KB of Flash is tight for a full bootloader plus application code with a communication stack. Plan for a lean firmware build or use the 1 KB EEPROM for calibration constants and configuration parameters, freeing Flash for code. The 8 KB RAM supports moderate buffering — enough for a few UART packets or a small data log, but not for a large display frame buffer or extensive DSP workspace. The STM32L031K4U6TR carries an EOL lifecycle stage. That means the manufacturer has announced end-of-life — a last-time-buy window is active or closing. If this part is on your BOM, now is the time to secure a final quantity or qualify a pin-compatible alternative within the STM32L0 series (same package, similar peripheral set).","metaTitle":"ST STM32L031K4U6TR ARM Cortex-M0+ MCU, 32 MHz, 16 KB Flash","metaDescription":"STMicroelectronics STM32L031K4U6TR 32-bit MCU, 32 MHz, 16 KB Flash, 8 KB RAM, 1 KB EEPROM, 27 I/O, -40 to 85°C, 32-UFQFPN. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Mfr":"STMicroelectronics","Speed":"32MHz","Series":"STM32L0","Package":"Tape & Reel (TR)","RAM Size":"8K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"1K x 8","Peripherals":"Brown-out Detect/Reset, DMA, POR, PWM, WDT","Connectivity":"I²C, IrDA, LINbus, SPI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"27","Core Processor":"ARM® Cortex®-M0+","Package / Case":"32-UFQFN Exposed Pad","Product Status":"Active","Data Converters":"A/D 10x12b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"STM32L031","Program Memory Size":"16KB (16K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"32-UFQFPN (5x5)","Voltage - Supply (Vcc/Vdd)":"1.8V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.4929","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/9da9efc4233dfdd482528b8b281fc32a.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM32L031K4U6TR/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to STM32L031K4U6TR?","answer":"Within the STM32L0 series, a pin-compatible upgrade would be a member with larger Flash/RAM in the same 32-UFQFPN package — for example, the STM32L051K8U6 (64 KB Flash, 8 KB RAM). Verify the peripheral set and supply voltage match your firmware before substituting."},{"question":"What is STM32L031K4U6TR's speed rating?","answer":"The core runs at 32 MHz."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L031K4U6TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L031K4U6TR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-11T18:12:59.411Z","lastPublished":"2026-07-11T18:12:59.411Z","indexable":true}}