{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L451RCY6TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L451RCY6TR","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L451RCY6TR","factsUrl":"https://icboms.com/api/mcp/products/STM32L451RCY6TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32L451RCY6TR, ARM Cortex-M4 32-bit MCU, 80 MHz, 256 KB Flash, 160 KB SRAM, 1.71 V–3.6 V supply, 64-WLCSP (3.36x3.66 mm), -40°C to 85°C.","salesMarkdown":"80 MHz is the sweet spot in the STM32L4 line: fast enough to run a DSP filter or a FFT on live sensor data without an external accelerator, yet the dynamic current stays low enough that a 250 mAh coin cell can sustain intermittent operation for months. The Cortex-M4 core with single-precision FPU handles the math that would stall an M0+ or an M3, so if your algorithm involves PID loops, motor observers, or audio processing, this core saves you a separate DSP chip. The 160 KB SRAM is split across multiple banks with parity on the main SRAM, which simplifies safety-oriented firmware — a single-bit upset gets caught without a full ECC engine. The 256 KB Flash supports dual-bank operation, so you can do over-the-air updates by writing one bank while executing from the other. ## Connectivity and analog — what is on the die The 52 I/Os in the 64-WLCSP package are enough to drive a parallel LCD and a keypad matrix while leaving serial buses free. On the analog side, there are 16 channels of 12-bit ADC and a single 12-bit DAC, which covers most sensor-conditioning and control-output needs without external converters. ## Package and assembly — the WLCSP footprint It saves board area versus a 64-pin LQFP, but it requires a controlled SMT process — the balls are small, and the board needs a solder-mask-defined pad with a via-in-pad layout if you route all 52 I/Os. This is a package for production volumes where every square millimetre matters; for prototyping or rework, the LQFP-64 variant (STM32L451RCT6) is easier to hand-solder. ## Lifecycle and supply — where this part sits in the cycle For a BOM line, this means no last-time-buy risk and full factory support for new designs.","metaTitle":"STM32L451RCY6TR ARM Cortex-M4 MCU, 80 MHz, 256 KB Flash","metaDescription":"STMicroelectronics STM32L451RCY6TR 32-bit ARM Cortex-M4 MCU at 80 MHz with 256 KB Flash, 160 KB SRAM, 1.71 V–3.6 V supply, in 64-WLCSP.","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":"160K 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, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"52","Core Processor":"ARM® Cortex®-M4","Package / Case":"64-UFBGA, WLCSP","Product Status":"Active","Data Converters":"A/D 16x12b; D/A 1x12b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"STM32L451","Program Memory Size":"256KB (256K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C~85°C(TA)","Supplier Device Package":"64-WLCSP (3.36x3.66)","Voltage - Supply (Vcc/Vdd)":"1.71V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.4600","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/0661af420d754d37ee77b070d7d5943e.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is STM32L451RCY6TR suitable for battery-powered applications?","answer":"Yes. The 80 MHz Cortex-M4 core delivers enough performance for sensor processing without draining the cell."},{"question":"What is the replacement for STM32L451RCY6TR if obsolete?","answer":"If you are looking for a pin-compatible alternate within the STM32L4 family, the STM32L452 series shares the same package and pinout but adds a second DAC and a few extra peripherals. Check the STM32L452 datasheet for the exact feature delta."},{"question":"How does STM32L451RCY6TR compare to STM32L452?","answer":"The STM32L452 is a close sibling with the same Cortex-M4 core at 80 MHz, same Flash and SRAM sizes, and the same 64-WLCSP package. The main difference is that the STM32L452 adds a second 12-bit DAC and a few more serial interfaces. If your design needs two analog outputs, the STM32L452 is the natural upgrade; otherwise, the STM32L451 is functionally identical at a slightly lower cost."},{"question":"What is the core of STM32L451RCY6TR?","answer":"The core is an ARM Cortex-M4 with single-precision floating-point unit, running at up to 80 MHz."},{"question":"What is the maximum operating frequency of STM32L451RCY6TR?","answer":"80 MHz."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L451RCY6TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L451RCY6TR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T12:48:29.772Z","lastPublished":"2026-07-16T12:48:29.772Z","indexable":true}}