{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L431KBU6","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L431KBU6","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L431KBU6","factsUrl":"https://icboms.com/api/mcp/products/STM32L431KBU6","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32L4 series, STM32L431KBU6, ARM Cortex-M4 32-bit MCU, 80 MHz, 128 KB Flash, 64 KB SRAM, 1.71 V to 3.6 V, -40°C to 85°C, 32-UFQFPN (5x5 mm) exposed pad.","salesMarkdown":"The 32-UFQFPN package with exposed pad measures 5x5 mm. The thermal resistance numbers assume that pad is soldered to a copper plane. STMicroelectronics lists the STM32L431KBU6 as Active. The base product number STM32L431 is shared across density and package variants, so if a future board spin needs more Flash or a different pin count, the migration stays within the same family without a core architecture change. ## 26 I/O in a 5x5 mm footprint — layout and sourcing notes The shipping medium is Tray, not Tape & Reel. For prototype or low-volume builds, tray quantities typically avoid the minimum reel commitment. ## STM32L151CBU6A — a lower-speed, higher-I/O alternative The STM32L151CBU6A runs a Cortex-M3 at 32 MHz and offers 37 I/O plus USB, compared to the L431's 26 I/O and 80 MHz Cortex-M4 with FPU. The L151 also includes capacitive-sensing touch support.","metaTitle":"STM32L431KBU6 STM32L4 MCU, ARM Cortex-M4, 80 MHz","metaDescription":"STMicroelectronics STM32L431KBU6 32-bit ARM Cortex-M4 MCU, 80 MHz, 128 KB Flash, 64 KB SRAM, 1.71-3.6 V, -40 to 85°C, 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 ~ 85°C (TA)","Supplier Device Package":"32-UFQFPN (5x5)","Voltage - Supply (Vcc/Vdd)":"1.71V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.9100","priceTiers":[{"qty":1,"price":"$4.91000","currency":"USD"},{"qty":10,"price":"$4.40600","currency":"USD"},{"qty":25,"price":"$4.16560","currency":"USD"},{"qty":80,"price":"$3.61013","currency":"USD"},{"qty":230,"price":"$3.42496","currency":"USD"},{"qty":440,"price":"$3.07320","currency":"USD"},{"qty":945,"price":"$2.59186","currency":"USD"},{"qty":2940,"price":"$2.46227","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/5001c15c5be880a0e65d1dfc08e4f0cc.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM32L431KBU6/alternatives.json"},"ai":{"faq":[{"question":"Does STM32L431KBU6 come in tape and reel or tray packaging?","answer":"The listed packaging is Tray. If your assembly line requires Tape & Reel, confirm the correct suffix variant with your distributor before ordering."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L431KBU6","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L431KBU6 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}}