{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L431CBY7TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L431CBY7TR","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L431CBY7TR","factsUrl":"https://icboms.com/api/mcp/products/STM32L431CBY7TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32L4 series, ARM Cortex-M4 32-bit MCU, 80MHz, 128KB Flash, 64K x 8 RAM, 1.71V~3.6V, 39 I/O, 49-WLCSP, -40°C~105°C.","salesMarkdown":"## 80 MHz Cortex-M4 with FPU — compute headroom for sensor fusion and control loops The STM32L431CBY7TR: The 49-WLCSP package measures 3.14 x 3.13 mm. The 80 MHz Cortex-M4 core includes a single-precision FPU and DSP instructions, giving it the compute margin for sensor fusion, motor-control FOC loops, or audio processing without offloading to a separate DSP. The 128 KB Flash is adequate for mid-complexity application code with a RTOS; the 64 KB SRAM leaves room for several large buffers or a modest heap. ## WLCSP package — PCB layout and rework considerations The 49-WLCSP package requires a fine-pitch PCB footprint and solder-mask-defined pad layout. ## Peripheral set — CAN, QSPI, multiple serial interfaces Connectivity includes CANbus, I²C, SPI, UART/USART, QSPI, SAI, and SWPMI — enough for gateway nodes, multi-sensor aggregators, or human-machine interfaces. The base product number STM32L431 covers multiple Flash and package variants, so the family roadmap is stable.","metaTitle":"STM32L431CBY7TR ARM Cortex-M4 MCU, 80MHz, 128KB Flash, WLCSP","metaDescription":"STMicroelectronics STM32L431CBY7TR 32-bit MCU with ARM Cortex-M4 core at 80MHz, 128KB Flash, 64KB SRAM, 49-WLCSP package, -40 to 105°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); 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, QSPI, SAI, SPI, SWPMI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"39","Core Processor":"ARM® Cortex®-M4","Package / Case":"49-UFBGA, WLCSP","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~105°C(TA)","Supplier Device Package":"49-WLCSP (3.14x3.13)","Voltage - Supply (Vcc/Vdd)":"1.71V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$6.4800","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/5001c15c5be880a0e65d1dfc08e4f0cc.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the equivalent replacement for STM32L431CBY7TR?","answer":"The STM32L431CBY7TR is a WLCSP-packaged variant of the STM32L431 family. Pin-compatible alternatives within the same family include the STM32L431CBY6 (same 128 KB Flash, 64 KB SRAM, 49-WLCSP) and other STM32L431 density options. For a direct WLCSP drop-in with identical memory and package, the STM32L431CBY6 is the closest sibling. No official successor part number has been issued since this device is still active."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L431CBY7TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L431CBY7TR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T12:40:15.129Z","lastPublished":"2026-07-16T12:40:15.129Z","indexable":true}}