{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L431KCU6","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L431KCU6","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L431KCU6","factsUrl":"https://icboms.com/api/mcp/products/STM32L431KCU6","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32L4 series, STM32L431KCU6, ARM Cortex-M4, 32-Bit Single-Core, 80MHz, 256KB Flash, 64K x 8 RAM, CANbus, I²C, IrDA, LINbus, QSPI, SAI, SPI, SWPMI, UART/USART, 26 I/O, 1.71V ~ 3.6V, -40°C ~ 85°C, 32-UFQFN Exposed Pad.","salesMarkdown":"## 80 MHz Cortex-M4 in a 5x5 mm footprint — what this buys you The STM32L431KCU6 is an STMicroelectronics ultra-low-power MCU built around an ARM Cortex-M4 core with FPU, clocked at 80 MHz. ## 256 KB Flash, 64 KB SRAM — sizing the firmware and data buffer The 256 KB Flash is sufficient for a full sensor-fusion stack, a lightweight RTOS, and a Bluetooth or Sub-1 GHz protocol stack without external memory. The 64 KB SRAM gives room for multiple packet buffers and a modest heap for dynamic allocation. If your application needs larger lookup tables or OTA staging, the QSPI interface (listed among the connectivity options) lets you attach a serial NOR Flash without consuming the parallel bus. ## Connectivity that covers fieldbus and audio The peripheral set includes a CANbus controller for industrial fieldbus links, QSPI for high-speed serial memory expansion, and an SAI (Serial Audio Interface) for connecting digital microphones or audio codecs. The SWPMI interface supports smart-card or subscriber-identity-module communication. For general-purpose serial, you get I²C, SPI, and multiple UART/USARTs with IrDA support. The 26 GPIOs in the 32-UFQFN package are enough to manage a small sensor array plus a display interface. ROHS3 compliance is certified.","metaTitle":"STM32L431KCU6 MCU, 80MHz Cortex-M4, 256KB Flash, 32-UFQFN","metaDescription":"STMicroelectronics STM32L431KCU6 32-bit ARM Cortex-M4 MCU, 80MHz, 256KB Flash, 64KB SRAM, CANbus, QSPI, SAI, 1.71-3.6V, active production, ROHS3.","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":"256KB (256K 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":"$5.7900","priceTiers":[{"qty":1,"price":"$5.79000","currency":"USD"},{"qty":10,"price":"$5.19600","currency":"USD"},{"qty":25,"price":"$4.91200","currency":"USD"},{"qty":80,"price":"$4.25713","currency":"USD"},{"qty":230,"price":"$4.03883","currency":"USD"},{"qty":440,"price":"$3.62405","currency":"USD"},{"qty":945,"price":"$3.05641","currency":"USD"},{"qty":2940,"price":"$2.90360","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/5001c15c5be880a0e65d1dfc08e4f0cc.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM32L431KCU6/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between STM32L431KCU6 and STM32L431CCU6?","answer":"The primary difference is Flash memory density: the STM32L431KCU6 carries 256 KB Flash, while the STM32L431CCU6 is a lower-density variant with 256 KB Flash as well — the 'KC' and 'CC' suffixes denote package and temperature options rather than memory size. Both share the same 32-UFQFN package and Cortex-M4 core at 80 MHz. For exact memory and peripheral differences, compare the ordering information table in the datasheet."},{"question":"Does STM32L431KCU6 support CAN bus?","answer":"Yes, CANbus is listed among the connectivity interfaces, alongside I²C, IrDA, LINbus, QSPI, SAI, SPI, SWPMI, and UART/USART."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L431KCU6","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L431KCU6 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}}