{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM8S903K3U6","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM8S903K3U6","canonicalUrl":"https://icboms.com/stmicroelectronics/STM8S903K3U6","factsUrl":"https://icboms.com/api/mcp/products/STM8S903K3U6","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM8S903K3U6, STM8S series 8-bit MCU, 16 MHz core, 8 KB Flash, 1 KB RAM, 640 B EEPROM, 2.95 V to 5.5 V supply, -40°C to 85°C, 28 I/O, UFQFPN-32 package.","salesMarkdown":"The 32-UFQFPN package with exposed pad (5x5 mm) keeps the footprint compact for space-constrained PCBs. ## Memory sizing — what fits and what doesn't With 8 KB of Flash, this part targets firmware under about 6.5 KB after bootloader and interrupt vector overhead. The 1 KB SRAM handles a modest stack and a few frame buffers — enough for a UART command parser or a PID loop with 32-bit coefficients. The 640-byte EEPROM is useful for calibration constants, fault logs, or node addresses that survive a firmware update. If your application needs over-the-air image storage or a large lookup table, you'll need to step up to a higher-density STM8S variant.","metaTitle":"ST STM8S903K3U6 8-bit MCU, 16 MHz, 8 KB Flash, UFQFPN-32","metaDescription":"STMicroelectronics STM8S903K3U6 8-bit MCU: 16 MHz core, 8 KB Flash, 1 KB RAM, 640 B EEPROM, 2.95-5.5 V supply, -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":"16MHz","Series":"STM8S","Package":"Tray","RAM Size":"1K x 8","Core Size":"8-Bit","EEPROM Size":"640 x 8","Peripherals":"Brown-out Detect/Reset, POR, PWM, WDT","Connectivity":"I²C, IrDA, LINbus, SPI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"28","Core Processor":"STM8","Package / Case":"32-UFQFN Exposed Pad","Product Status":"Active","Data Converters":"A/D 7x10b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Base Product Number":"STM8","Program Memory Size":"8KB (8K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"32-UFQFPN (5x5)","Voltage - Supply (Vcc/Vdd)":"2.95V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.1200","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/99a7192c520a3283640c68821053efb2.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM8S903K3U6/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the STM8S903K3U6 and get a price?","answer":"Submit an RFQ for current availability and pricing — both are confirmed at quote time. No stock or price figures are published here."},{"question":"Can the STM8S903K3U6 replace the STM8S903K3?","answer":"The STM8S903K3U6 is the UFQFPN-32 package variant of the STM8S903K3 base part. The 'U6' suffix indicates the package and temperature grade. Pin compatibility depends on the exact package of the STM8S903K3 variant you are comparing — verify the footprint against your PCB layout."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM8S903K3U6","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM8S903K3U6 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}}