{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L431RCI6","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L431RCI6","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L431RCI6","factsUrl":"https://icboms.com/api/mcp/products/STM32L431RCI6","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32L431RCI6, STM32L4 series, ARM Cortex-M4 32-bit MCU, 80 MHz, 256 KB Flash, 64 KB SRAM, 52 I/O, CANbus, QSPI, 64-UFBGA (5x5 mm), -40°C to 85°C.","salesMarkdown":"## 80 MHz Cortex-M4 in a 5x5 mm BGA — what that buys the firmware The STM32L431RCI6: ARM Cortex-M4 core with FPU, clocked at 80 MHz. The 64-UFBGA package measures 5x5 mm. ## Peripheral set — CANbus, QSPI, and the rest This MCU carries CANbus (2.0B active), QSPI (for external Flash or RAM), SAI (audio serial interface), and SWPMI (single-wire protocol). That CANbus interface is the key differentiator versus the STM32L0 or STM32L1 families — if your BOM needs a CAN node, this part saves an external CAN transceiver controller. The QSPI lets you memory-map external Flash for code shadowing or data logging without bit-banging. The 52 I/O lines are available in the 64-ball UFBGA, with most multiplexed to the usual STM32L4 peripherals: multiple SPI, I2C, UART/USART, and a 16-channel 12-bit ADC plus two 12-bit DACs. Brown-out detect, DMA, and PWM are standard. ## Lifecycle and BOM commitment The base product number STM32L431 is a current-production family, so toolchain and documentation support are mature. For dual-sourcing resilience, note that the STM32L151CBU6A (Cortex-M3, 32 MHz, fewer peripherals) is a different architecture — not a pin-compatible second source, but a functional alternative if your firmware can be ported down.","metaTitle":"STM32L431RCI6 ARM Cortex-M4 MCU, 80 MHz, 256 KB Flash","metaDescription":"STMicroelectronics STM32L431RCI6 32-bit MCU with ARM Cortex-M4 core at 80 MHz, 256 KB Flash, 64 KB SRAM, CANbus, QSPI, 64-UFBGA. Active, ROHS3 compliant.","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, 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":"256KB (256K 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":"$6.4100","priceTiers":[{"qty":1,"price":"$6.41000","currency":"USD"},{"qty":10,"price":"$5.75700","currency":"USD"},{"qty":25,"price":"$5.44280","currency":"USD"},{"qty":80,"price":"$4.71700","currency":"USD"},{"qty":230,"price":"$4.47504","currency":"USD"},{"qty":440,"price":"$4.01545","currency":"USD"},{"qty":945,"price":"$3.38653","currency":"USD"},{"qty":2940,"price":"$3.21720","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/5001c15c5be880a0e65d1dfc08e4f0cc.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM32L431RCI6/alternatives.json"},"ai":{"faq":[{"question":"Is STM32L431RCI6 a drop-in replacement for STM32L431RCT6?","answer":"No — the STM32L431RCT6 is the LQFP-64 package variant of the same die. The STM32L431RCI6 is the 64-UFBGA (5x5 mm) version. The pinout and ball map differ, so a board designed for the LQFP cannot accept the BGA without a PCB redesign. The core, memory, and peripherals are identical."},{"question":"Does STM32L431RCI6 support CAN bus?","answer":"Yes, it includes a CANbus (2.0B active) interface as part of its connectivity set, along with I2C, SPI, UART/USART, QSPI, SAI, and SWPMI."},{"question":"Is STM32L431RCI6 RoHS compliant?","answer":"Yes, it is ROHS3 compliant per the manufacturer's listing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L431RCI6","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L431RCI6 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}}