{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L431RBT6TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L431RBT6TR","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L431RBT6TR","factsUrl":"https://icboms.com/api/mcp/products/STM32L431RBT6TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32L4 series, ARM Cortex-M4 32-bit MCU, 80MHz, 128KB Flash, 64KB SRAM, 64-LQFP (10x10mm), -40 to 85°C, 1.71-3.6V.","salesMarkdown":"## 80 MHz Cortex-M4 with 128 KB Flash — the mid-range STM32L4 sweet spot The STM32L431RBT6TR: It belongs to the STM32L4 series, ST's ultra-low-power line built on a 40 nm process, targeting battery-operated and energy-harvesting designs where every microamp matters. ## Memory map and analog front-end The 128 KB Flash and 64 KB SRAM partition leaves roughly 40-50 KB of SRAM free after a typical RTOS and HAL footprint, which is adequate for a 16-channel ADC scan buffer or a small audio frame. The 52 GPIOs in the 64-LQFP package give enough headroom for a parallel LCD interface or a bank of pushbuttons and LEDs alongside the serial peripherals. ## Connectivity and peripheral set The STM32L431RBT6TR includes CANbus, multiple I2C and SPI ports, UART/USART with LIN and IrDA support, plus a Quad-SPI interface for external Flash — a connectivity set that covers industrial fieldbus and sensor networks. A dedicated SAI (serial audio interface) and SWPMI (single-wire protocol master interface) are also present, expanding the part's reach into audio processing and smart-card reader applications. The part is ROHS3 compliant, meeting the latest EU directive on hazardous-substance restrictions.","metaTitle":"STM32L431RBT6TR STM32L4 MCU, 80MHz Cortex-M4, 128KB Flash","metaDescription":"STM32L431RBT6TR: STMicroelectronics 32-bit MCU, ARM Cortex-M4 at 80MHz, 128KB Flash, 64KB SRAM, 64-LQFP. Active production, ROHS3. Sourced to order against RFQ.","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":"Tape & Reel (TR) Cut Tape (CT)","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-LQFP","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-LQFP (10x10)","Voltage - Supply (Vcc/Vdd)":"1.71V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.8200","priceTiers":[{"qty":1,"price":"$5.82000","currency":"USD"},{"qty":10,"price":"$5.22900","currency":"USD"},{"qty":25,"price":"$4.94280","currency":"USD"},{"qty":100,"price":"$4.28390","currency":"USD"},{"qty":250,"price":"$4.06416","currency":"USD"},{"qty":500,"price":"$3.64678","currency":"USD"},{"qty":1000,"price":"$3.07559","currency":"USD"},{"qty":2000,"price":"$2.92181","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/5001c15c5be880a0e65d1dfc08e4f0cc.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM32L431RBT6TR/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to STM32L431RBT6TR in the STM32L4 family?","answer":"The STM32L431RBT6TR is the 128 KB Flash variant in the 64-LQFP package. The STM32L432KC offers a smaller 32-pin package with similar core but less I/O; the STM32L451RE steps up to 512 KB Flash in a larger package."},{"question":"What compliance documentation does STMicroelectronics provide for STM32L431RBT6TR?","answer":"ST certifies ROHS3 compliance for this part. REACH and UL documentation are typically available through the manufacturer's compliance portal; no specific UL or REACH certificate is listed in the standard product record."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L431RBT6TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L431RBT6TR 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}}