{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32F405OEY6BTR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32F405OEY6BTR","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32F405OEY6BTR","factsUrl":"https://icboms.com/api/mcp/products/STM32F405OEY6BTR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32F4 series, ARM® Cortex®-M4, 32-Bit Single-Core, 168MHz, 512KB (512K x 8) FLASH, 192K x 8 RAM, 72 I/O, 90-UFBGA WLCSP, -40°C ~ 85°C.","salesMarkdown":"## Cortex-M4 at 168 MHz in a WLCSP-90 footprint The STM32F405OEY6BTR: Single-cycle multiply-accumulate and floating-point unit in a 90-ball WLCSP package measuring 4.22 x 3.97 mm. ## 168 MHz — what it buys for the control loop At 168 MHz the Cortex-M4 core executes a 32-bit MAC or single-precision FPU operation in a single cycle. ## 512 KB Flash / 192 KB RAM — firmware staging and data buffers The 512 KB of Flash is organized as 4 sectors of 128 KB each, which maps to a straightforward OTA update strategy: one sector for the bootloader, two for the active application image, and one for the rollback image. The 192 KB of SRAM splits into 128 KB of general-purpose RAM plus 64 KB of CCM RAM tightly coupled to the core. The CCM region has no bus matrix contention, so time-critical interrupt vectors and stack can live there while the main RAM handles DMA buffers for the ADC and USB. Brown-out detect and POR are integrated, so an external supervisor is optional for most designs. ## WLCSP-90 — layout and assembly considerations The 90-ball WLCSP has a 0.4 mm pitch, which demands a controlled-impedance PCB stackup with microvias and a soldermask-defined pad. The package is lead-free compatible and rated MSL 3 — if the moisture-barrier bag has been open longer than the floor-life window, a 24-hour bake at 125°C is needed before reflow. The 4.22 x 3.97 mm body saves roughly 60% board area versus an LQFP-100, but the trade-off is that rework requires a hot-air station with a fine nozzle and a practised hand.","metaTitle":"ST STM32F405OEY6BTR ARM Cortex-M4 MCU, 168 MHz, 512 KB Flash","metaDescription":"STM32F405OEY6BTR is a 32-bit ARM Cortex-M4 MCU with 168 MHz core, 512 KB Flash, 192 KB RAM, 72 I/O, WLCSP-90. Industrial temp -40 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":"168MHz","Series":"STM32F4","Package":"Tape & Reel (TR)","RAM Size":"192K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"-","Peripherals":"Brown-out Detect/Reset, DMA, I²S, LCD, POR, PWM, WDT","Connectivity":"CANbus, EBI/EMI, I²C, IrDA, LINbus, SPI, UART/USART, USB OTG","Mounting Type":"Surface Mount","Number of I/O":"72","Core Processor":"ARM® Cortex®-M4","Package / Case":"90-UFBGA, WLCSP","Product Status":"Active","Data Converters":"A/D 13x12b; D/A 2x12b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"STM32F405","Program Memory Size":"512KB (512K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"90-WLCSP (4.22x3.97)","Voltage - Supply (Vcc/Vdd)":"1.8V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.5800","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/ba3a059be9cfe6bdf7cf0dbd3dcfbee9.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM32F405OEY6BTR/alternatives.json"},"ai":{"faq":[{"question":"Is STM32F405OEY6BTR equivalent to STM32F405OEY6?","answer":"The base product number STM32F405 covers a family of devices; the suffix OEY6BTR denotes the 90-WLCSP package in Tape & Reel. The STM32F405OEY6 (without the BTR suffix) is the same silicon and package, but shipped in tray or tube rather than tape-and-reel. Functionally they are identical — the difference is the shipping medium."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32F405OEY6BTR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32F405OEY6BTR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}