{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L431RBI6TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L431RBI6TR","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L431RBI6TR","factsUrl":"https://icboms.com/api/mcp/products/STM32L431RBI6TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32L4 series, ARM Cortex-M4, 32-bit, 80MHz, 128KB Flash, 64K x 8 RAM, 64-UFBGA (5x5), -40°C to 85°C, 1.71V to 3.6V supply.","salesMarkdown":"The STM32L431RBI6TR: ARM Cortex-M4 with FPU at 80 MHz, 128 KB Flash, 64 KB SRAM. With 52 general-purpose I/Os and a connectivity set that includes CANbus, I²C, SPI, UART/USART, QSPI, and SAI, this MCU can handle a mixed-signal sensor hub, a motor-control node, or a fieldbus gateway without external interface chips. The internal oscillator saves two external components, though a precision clock source is still advisable for CAN or USB timing if your design uses those peripherals. ## 64-UFBGA (5x5) — footprint and assembly The 64-UFBGA package measures 5x5 mm with a 0.5 mm ball pitch. This is a fine-pitch BGA that requires a controlled stencil thickness (typically 0.1 mm) and a reflow profile with a peak temperature around 245°C for lead-free solder. The small footprint saves board space but complicates manual rework — plan for X-ray inspection of the BGA joints after assembly. The exposed pad on the underside provides a thermal path to the PCB ground plane, so place at least four thermal vias under the pad for heat spreading if the MCU runs continuous high-duty-cycle PWM or ADC conversions. ## Lifecycle and supply posture This removes the supply risk for new designs and allows multi-year production commitments.","metaTitle":"STM32L431RBI6TR ARM Cortex-M4 MCU, 80 MHz, 128 KB Flash","metaDescription":"STMicroelectronics STM32L431RBI6TR 32-bit ARM Cortex-M4 MCU at 80 MHz, 128 KB Flash, 64 KB SRAM, 64-UFBGA, -40°C to 85°C. Active lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Mfr":"STMicroelectronics","Speed":"80MHz","Series":"STM32L4","Package":"Tape & Reel (TR)","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":"128KB (128K 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":"$2.7171","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/5001c15c5be880a0e65d1dfc08e4f0cc.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between STM32L431RBI6TR and STM32L431RBI6?","answer":"The 'TR' suffix on STM32L431RBI6TR indicates Tape & Reel packaging, while STM32L431RBI6 ships in tray format. The silicon, pinout, and all electrical specifications are identical between the two order codes. The Tape & Reel variant is the standard choice for high-volume SMT assembly lines."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L431RBI6TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L431RBI6TR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T12:40:47.392Z","lastPublished":"2026-07-16T12:40:47.392Z","indexable":true}}