{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L431RBI3","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L431RBI3","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L431RBI3","factsUrl":"https://icboms.com/api/mcp/products/STM32L431RBI3","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32L4 series, STM32L431RBI3, 32-bit ARM Cortex-M4 MCU, 80 MHz, 128 KB Flash, 64 KB SRAM, 52 I/O, 64-UFBGA (5x5), -40 to 85 °C.","salesMarkdown":"The STM32L431RBI3 is a 32-bit ARM Cortex-M4 single-core microcontroller from the STM32L4 ultra-low-power series, clocked at 80 MHz. It carries 128 KB of Flash program memory and 64 KB of SRAM, with 52 general-purpose I/Os brought out to a 64-ball UFBGA package measuring 5x5 mm. ## 80 MHz Cortex-M4 — what the speed rating means for your loop The 80 MHz core clock on this ARM Cortex-M4 with single-precision FPU provides headroom for a real-time control loop or sensor-fusion algorithm. The 64 KB SRAM is the hard limit for data buffers and stack. The lifecycle stage for this part is recorded as EOL hot, meaning the manufacturer has announced end-of-life and the last-time-buy window is closing. If you have an active BOM line using the STM32L431RBI3, secure final production quantities or qualify a replacement.","metaTitle":"ST STM32L431RBI3 ARM Cortex-M4 MCU, 80 MHz, 128 KB Flash","metaDescription":"STMicroelectronics STM32L431RBI3 32-bit MCU, ARM Cortex-M4 at 80 MHz, 128 KB Flash, 64 KB SRAM, 64-UFBGA, -40 to 85 °C. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Mfr":"STMicroelectronics","Speed":"80MHz","Series":"STM32L4","Package":"Tray","RAM Size":"64K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, DMA, PWM, WDT","Connectivity":"CANbus, I²C, IrDA, LINbus, MMC/SD, QSPI, SAI, SPI, SWPMI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"52","Core Processor":"ARM® Cortex®-M4","Package / Case":"64-UFBGA","Product Status":"Active","Data Converters":"A/D 16x12b; D/A 2x12b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"STM32L431","Program Memory Size":"128KB (128K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"64-UFBGA (5x5)","Voltage - Supply (Vcc/Vdd)":"1.71V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.0175","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/6a1fdbdd0d5a7a205eecf25d7ff32326.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM32L431RBI3/alternatives.json"},"ai":{"faq":[{"question":"What is STM32L431RBI3's listed speed?","answer":"The core processor runs at 80 MHz on an ARM Cortex-M4 with single-precision FPU."},{"question":"What series is STM32L431RBI3 from?","answer":"It belongs to the STM32L4 series, ST's ultra-low-power 32-bit ARM Cortex-M4 family."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L431RBI3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L431RBI3 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}}