{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM32L021D4P7","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM32L021D4P7","canonicalUrl":"https://icboms.com/stmicroelectronics/STM32L021D4P7","factsUrl":"https://icboms.com/api/mcp/products/STM32L021D4P7","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM32L0 series STM32L021D4P7, ARM Cortex-M0+, 32-Bit Single-Core, 32MHz, 16KB Flash, 2K x 8 RAM, 512 x 8 EEPROM, 14-TSSOP, -40°C~105°C, 1.65V~3.6V.","salesMarkdown":"## 32 MHz Cortex-M0+ with 16 KB Flash — small-footprint, low-power MCU It packs 16 KB of Flash program memory, 2 KB of SRAM, and 512 bytes of embedded EEPROM — enough for a single-threaded control loop, sensor fusion, or a small protocol stack without external memory. The 14-TSSOP package (4.40 mm wide) with 11 I/O suits compact sensor nodes, handheld tools, and IoT edge devices where board area is tight. The 1.65 V minimum supply is the key enabler for single-cell battery designs: a 1.5 V alkaline cell stays above the brown-out threshold through most of its discharge curve. ## Memory and peripheral mix — what the 16 KB / 2 KB / 512 B budget buys The 2 KB SRAM handles a few hundred bytes of stack and a small data buffer; if your application needs a large frame buffer or a TCP/IP stack, this part will run out of RAM. The 512 bytes of EEPROM are useful for storing calibration coefficients, node IDs, or configuration parameters without wearing the Flash. The 4-channel 12-bit ADC is enough for reading a thermistor, a potentiometer, or a current-sense resistor; for more channels you would step up to a larger STM32L0 variant. For dual-sourcing resilience, the STM32L0 family includes pin-compatible siblings with different memory sizes — the same 14-TSSOP footprint — so a firmware-only migration is possible if the project needs more Flash or RAM later.","metaTitle":"STM32L021D4P7 ARM Cortex-M0+ MCU, 32 MHz, 16 KB Flash","metaDescription":"STM32L021D4P7 32-bit MCU from STMicroelectronics: 32 MHz Cortex-M0+, 16 KB Flash, 2 KB SRAM, 512 B EEPROM, 1.65 V–3.6 V, -40°C to 105°C, 14-TSSOP.","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":"Tube","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":"11","Core Processor":"ARM® Cortex®-M0+","Package / Case":"14-TSSOP (0.173\\\", 4.40mm Width)","Product Status":"Active","Data Converters":"A/D 4x12b","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~105°C(TA)","Supplier Device Package":"14-TSSOP","Voltage - Supply (Vcc/Vdd)":"1.65V ~ 3.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.2100","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/38f4913da5f8c5ecbeb2975af23dcaa9.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is STM32L021D4P7 suitable for battery-powered IoT devices?","answer":"Yes. The 1.65 V minimum supply allows operation from a single alkaline cell or Li-Po battery, and the ultra-low-power STM32L0 architecture is designed for extended battery life. The 32 MHz Cortex-M0+ core delivers enough throughput for sensor polling, wireless protocol handling, and periodic sleep-wake cycles."},{"question":"Can STM32L021D4P7 replace STM32L031D4P7?","answer":"Both parts share the same 14-TSSOP package and STM32L0 family peripheral set, but the STM32L021D4P7 has 16 KB Flash and 2 KB SRAM, while the STM32L031D4P7 offers 32 KB Flash and 8 KB SRAM. If your firmware fits within the smaller memory, the STM32L021D4P7 is a drop-in replacement. Verify the exact pinout — the 14-TSSOP pin assignments are consistent across the STM32L0 value-line density options, but always confirm against the datasheet."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM32L021D4P7","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM32L021D4P7 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T12:35:48.200Z","lastPublished":"2026-07-16T12:35:48.200Z","indexable":true}}