{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L021F4U6TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L021F4U6TR","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L021F4U6TR","factsUrl":"https://icboms.com/api/mcp/products/STM32L021F4U6TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32L021F4U6TR, STM32L0 series, 32-bit ARM Cortex-M0+ MCU, 32 MHz, 16 KB Flash, 2K x 8 RAM, 512 x 8 EEPROM, 1.65 V to 3.6 V, -40°C to 85°C, 20-UFQFPN (3x3 mm).","salesMarkdown":"## 32 MHz ARM Cortex-M0+ in a 3x3 mm footprint ## Memory and peripheral budget for constrained designs With 16 KB of Flash and 2 KB of RAM, this part targets applications where code fits in a few thousand instructions and data stays small — think a temperature logger, a pulse counter, or a simple PWM fan controller. The 512-byte EEPROM is useful for calibration constants or serial numbers that survive power loss without external storage. The 16 available I/O pins in the 20-UFQFPN package mean most of the peripherals are accessible, but a dense design will need to share pins carefully. The base product number is STM32L021, and the series is STM32L0 — a mature, widely second-sourced family. ROHS3 compliance is confirmed, which simplifies EU and global regulatory acceptance. ## Package and supply-rail notes The 20-UFQFPN package measures 3x3 mm.","metaTitle":"STM32L021F4U6TR STM32L0 MCU, 32 MHz, 16 KB Flash, 20-UFQFPN","metaDescription":"STMicroelectronics STM32L021F4U6TR 32-bit ARM Cortex-M0+ MCU, 32 MHz, 16 KB Flash, 2 KB RAM, 512 B EEPROM, 1.65-3.6 V, -40 to 85°C, 20-UFQFPN. Active lifecycle.","metaKeywords":null},"attributes":{"series":"STM32L0","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Mfr":"STMicroelectronics","Speed":"32MHz","Series":"STM32L0","Package":"Tape & Reel (TR) Cut Tape (CT)","RAM Size":"2K x 8","Core Size":"32-Bit Single-Core","EEPROM Size":"512 x 8","Peripherals":"Brown-out Detect/Reset, DMA, POR, PWM, WDT","Connectivity":"I²C, IrDA, SPI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"16","Core Processor":"ARM® Cortex®-M0+","Package / Case":"20-UFQFN","Product Status":"Active","Data Converters":"A/D 7x12b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"STM32L021","Program Memory Size":"16KB (16K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"20-UFQFPN (3x3)","Voltage - Supply (Vcc/Vdd)":"1.65V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.7400","priceTiers":[{"qty":1,"price":"$2.74000","currency":"USD"},{"qty":10,"price":"$2.45900","currency":"USD"},{"qty":25,"price":"$2.32000","currency":"USD"},{"qty":100,"price":"$1.97660","currency":"USD"},{"qty":250,"price":"$1.85596","currency":"USD"},{"qty":500,"price":"$1.62398","currency":"USD"},{"qty":1000,"price":"$1.34558","currency":"USD"},{"qty":3000,"price":"$1.25278","currency":"USD"},{"qty":6000,"price":"$1.20639","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/38f4913da5f8c5ecbeb2975af23dcaa9.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM32L021F4U6TR/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between STM32L021F4U6TR and STM32L021F4P6TR?","answer":"The difference is the package variant: the U6TR suffix indicates a 20-UFQFPN package (3x3 mm), while the P6TR suffix typically refers to a 20-TSSOP package. The core, memory, and peripheral set are identical. Verify the package footprint against your PCB layout before ordering."},{"question":"Is STM32L021F4U6TR RoHS compliant?","answer":"Yes, it is ROHS3 compliant per the listing, which covers the EU RoHS directive including the four phthalates."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L021F4U6TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L021F4U6TR when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}