{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L021K4T6","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L021K4T6","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L021K4T6","factsUrl":"https://icboms.com/api/mcp/products/STM32L021K4T6","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32L021K4T6, STM32L0 series, 32-bit ARM Cortex-M0+ MCU, 32 MHz, 16 KB Flash, 2K x 8 SRAM, 512 x 8 EEPROM, 28 I/O, I²C/SPI/UART, 32-LQFP, -40°C to 85°C, 1.65 V to 3.6 V.","salesMarkdown":"## 32 MHz Cortex-M0+ with 16 KB Flash — the power-conscious BOM fit The 32-LQFP package (7x7 mm) with 28 I/O lines provides enough GPIO for sensor interfaces, keypads, and small displays while keeping board area tight. The base product number is STM32L021, and the series (STM32L0) is a mature, widely deployed platform with long-term supply commitment from ST. The 1.65 V minimum supply is the key enabler for single-cell alkaline (1.5 V nominal) or LiFePO4 (1.65 V fully charged) operation without a boost converter. At the 3.6 V upper end, it tolerates a fully charged Li-ion cell (4.2 V) only if a series diode or regulator drops the voltage — the absolute maximum is 3.6 V, so a direct 4.2 V connection is outside the rated range. ## Memory sizing — 16 KB Flash, 2 KB SRAM, 512 B EEPROM The 16 KB Flash is sized for small firmware images — bootloader, sensor driver, communication stack, and a modest application loop. The 2 KB SRAM limits data buffers and stack depth; designs with large frame buffers or multi-packet serial queues should budget carefully. The 512-byte EEPROM (organized as 512 x 8) is useful for calibration constants, configuration parameters, and fault logs that survive power loss without external EEPROM — saving a package and a serial bus. ## 32-LQFP package — footprint and rework notes The 0.8 mm pitch is forgiving for inspection and touch-up. The supplier device package is 32-LQFP (7x7).","metaTitle":"STM32L021K4T6 ARM Cortex-M0+ MCU, 32 MHz, 16 KB Flash","metaDescription":"STMicroelectronics STM32L021K4T6 32-bit MCU, ARM Cortex-M0+ at 32 MHz, 16 KB Flash, 2 KB SRAM, 512 B EEPROM.","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":"Tray","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":"28","Core Processor":"ARM® Cortex®-M0+","Package / Case":"32-LQFP","Product Status":"Active","Data Converters":"A/D 10x12b","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":"32-LQFP (7x7)","Voltage - Supply (Vcc/Vdd)":"1.65V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.9300","priceTiers":[{"qty":1,"price":"$3.93000","currency":"USD"},{"qty":10,"price":"$3.52900","currency":"USD"},{"qty":25,"price":"$3.33600","currency":"USD"},{"qty":80,"price":"$2.89125","currency":"USD"},{"qty":230,"price":"$2.74296","currency":"USD"},{"qty":440,"price":"$2.46127","currency":"USD"},{"qty":1500,"price":"$2.07577","currency":"USD"},{"qty":3000,"price":"$2.02185","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/38f4913da5f8c5ecbeb2975af23dcaa9.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM32L021K4T6/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between STM32L021K4T6 and STM32L031K6T6?","answer":"The STM32L031K6T6 is a close sibling in the same STM32L0 family with a larger 32 KB Flash and 8 KB SRAM, but shares the same Cortex-M0+ core, 32 MHz speed, and 32-LQFP package. The STM32L021K4T6 has 16 KB Flash and 2 KB SRAM, making it the cost- and power-optimized choice for smaller firmware footprints."},{"question":"Can STM32L021K4T6 be used with an Arduino IDE?","answer":"Yes, the STM32L0 series is supported by the STM32duino core and the Arduino IDE through the STM32Cube programmer. The 16 KB Flash and 2 KB SRAM limit the size of Arduino libraries and sketches, but basic sensor reading, serial communication, and PWM control are feasible."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L021K4T6","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L021K4T6 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}}