{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L431KBU3","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L431KBU3","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L431KBU3","factsUrl":"https://icboms.com/api/mcp/products/STM32L431KBU3","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32L431KBU3, STM32L4 series, 32-bit ARM Cortex-M4 MCU, 80MHz, 128KB (128K x 8) FLASH, 64K x 8 RAM, 1.71V to 3.6V, -40°C to 125°C, 32-UFQFN Exposed Pad.","salesMarkdown":"## What this STM32L431KBU3 brings to the board The 32-UFQFN exposed pad package measures 5x5 mm. ## 80 MHz Cortex-M4 with FPU — the performance jump from the L1 series Compared to the STM32L151CBU6A (Cortex-M3 at 32 MHz), this part runs at 80 MHz and adds DSP instructions and an FPU. ## Active status — no LTB pressure for new designs The base number STM32L431 covers multiple Flash/RAM and package variants, so if you need more memory or a different footprint later, the family gives you an upgrade path without changing the core architecture. ## Peripheral mix and supply range The part includes CANbus, I²C, SPI, QSPI, SAI, and UART/USART — enough for industrial fieldbus or sensor hubs. Brown-out detect and DMA are built in, so you can save an external supervisor or offload data transfers from the core. Ten 12-bit ADC channels and two 12-bit DAC channels cover analog front-end needs for most mixed-signal boards. ## Field-fit note: package and orientation No lab, no bench — if you are swapping this on site, a hot-air station with a fine nozzle and a preheat plate is the minimum; a soldering iron alone will not get the pad wet.","metaTitle":"ST STM32L431KBU3 ARM Cortex-M4 MCU, 80MHz, 128KB Flash","metaDescription":"STMicroelectronics STM32L431KBU3 32-bit MCU, ARM Cortex-M4 at 80MHz, 128KB Flash, 64KB RAM, -40 to 125°C, CAN, I²C, SPI, 32-UFQFPN. Active lifecycle.","metaKeywords":null},"attributes":{"series":"STM32L4","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","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, QSPI, SAI, SPI, SWPMI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"26","Core Processor":"ARM® Cortex®-M4","Package / Case":"32-UFQFN Exposed Pad","Product Status":"Active","Data Converters":"A/D 10x12b; 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 ~ 125°C (TA)","Supplier Device Package":"32-UFQFPN (5x5)","Voltage - Supply (Vcc/Vdd)":"1.71V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.6400","priceTiers":[{"qty":1,"price":"$5.64000","currency":"USD"},{"qty":10,"price":"$5.06700","currency":"USD"},{"qty":25,"price":"$4.79040","currency":"USD"},{"qty":80,"price":"$4.15175","currency":"USD"},{"qty":230,"price":"$3.93878","currency":"USD"},{"qty":440,"price":"$3.53427","currency":"USD"},{"qty":945,"price":"$2.98071","currency":"USD"},{"qty":2940,"price":"$2.83168","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/5001c15c5be880a0e65d1dfc08e4f0cc.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM32L431KBU3/alternatives.json"},"ai":{"faq":[{"question":"Does STM32L431KBU3 have a CAN interface?","answer":"Yes, it includes a CANbus peripheral, along with I²C, SPI, QSPI, SAI, and UART/USART."},{"question":"Can STM32L431KBU3 replace STM32L431KBU6?","answer":"The 'U3' and 'U6' suffixes typically indicate different temperature grades or packaging options. Check the specific datasheet variant for pin compatibility — the base number STM32L431 suggests the same Flash/RAM and peripheral set, but the package and temperature grade must match your BOM."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L431KBU3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L431KBU3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}