{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L031E4Y6TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L031E4Y6TR","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L031E4Y6TR","factsUrl":"https://icboms.com/api/mcp/products/STM32L031E4Y6TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32L0 series STM32L031E4Y6TR, ARM Cortex-M0+, 32-Bit Single-Core, 32MHz, 16KB (16K x 8) FLASH, 8K x 8 RAM, 1K x 8 EEPROM, 25-UFBGA/WLCSP, 20 I/O, 1.8V ~ 3.6V, -40°C ~ 85°C.","salesMarkdown":"## 32 MHz Cortex-M0+ in a WLCSP — the space-constrained, low-power MCU choice It packs 16 KB of Flash program memory, 8 KB of SRAM, and 1 KB of embedded EEPROM — enough for a modest firmware image with non-volatile parameter storage, all in a 25-ball WLCSP (wafer-level chip-scale package) that occupies minimal board area. The part is aimed at battery-operated, space-limited, and industrial sensing applications where every milliwatt and square millimeter counts. ## Memory budget and peripheral set — what fits, what doesn't The 1 KB EEPROM (emulated or dedicated) holds calibration constants and configuration data without wearing the Flash. The 20 I/O lines in the WLCSP are enough for a sensor hub or a small motor-control interface. ## WLCSP package — footprint and assembly notes The 25-ball WLCSP (0.4 mm pitch typical for this class) is a direct-attach, no-underfill package that saves board space but demands careful PCB layout — fine traces, via-in-pad capability, and a solder-mask-defined pad. The supplier device package is 25-WLCSP; the package / case is also listed as 25-UFBGA. This is not a hand-solderable part; it requires a reflow oven and stencil.","metaTitle":"ST STM32L031E4Y6TR ARM Cortex-M0+ MCU, 32 MHz, 16 KB Flash","metaDescription":"STMicroelectronics STM32L031E4Y6TR 32-bit ARM Cortex-M0+ MCU, 32 MHz, 16 KB Flash, 8 KB RAM, 1 KB EEPROM, 25-WLCSP, -40°C to 85°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Mfr":"STMicroelectronics","Speed":"32MHz","Series":"STM32L0","Package":"Tape & Reel (TR)","RAM Size":"8K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"1K x 8","Peripherals":"Brown-out Detect/Reset, DMA, POR, PWM, WDT","Connectivity":"I²C, IrDA, LINbus, SPI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"20","Core Processor":"ARM® Cortex®-M0+","Package / Case":"25-UFBGA, WLCSP","Product Status":"Active","Data Converters":"A/D 10x12b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"STM32L031","Program Memory Size":"16KB (16K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"25-WLCSP","Voltage - Supply (Vcc/Vdd)":"1.8V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.1893","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/9da9efc4233dfdd482528b8b281fc32a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What package does the STM32L031E4Y6TR use?","answer":"The STM32L031E4Y6TR is supplied in a 25-ball WLCSP (wafer-level chip-scale package), also described as a 25-UFBGA. It is a surface-mount, fine-pitch package designed for reflow assembly."},{"question":"Can STM32L031E4Y6TR replace STM32L031E4Y6?","answer":"The STM32L031E4Y6TR is the Tape & Reel (TR) packaged variant of the base STM32L031E4Y6 device. The die and electrical specifications are identical; the difference is the shipping medium. The TR suffix indicates reel packaging for automated pick-and-place. They are functionally interchangeable."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L031E4Y6TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L031E4Y6TR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T12:35:50.326Z","lastPublished":"2026-07-16T12:35:50.326Z","indexable":true}}