{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM8S903K3U3","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM8S903K3U3","canonicalUrl":"https://icboms.com/stmicroelectronics/STM8S903K3U3","factsUrl":"https://icboms.com/api/mcp/products/STM8S903K3U3","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM8S903K3U3, STM8S series 8-bit MCU, 16 MHz core, 8 KB Flash, 1 KB RAM, 640 B EEPROM, 2.95V-5.5V supply, -40°C to 125°C, 28 I/O, 32-UFQFPN (5x5 mm), Tray.","salesMarkdown":"The STMicroelectronics STM8S903K3U3 is an 8-bit microcontroller from the STM8S family, built around the STM8 core and clocked at 16 MHz. Housed in a 32-UFQFN with an exposed pad (5x5 mm body), the part is surface-mount and compact.","metaTitle":"STM8S903K3U3 STM8S 8-bit MCU, 16 MHz, 8 KB Flash","metaDescription":"STMicroelectronics STM8S903K3U3 8-bit MCU, 16 MHz core, 8 KB Flash, 1 KB RAM, 640 B EEPROM, -40 to 125°C, 28 I/O, UFQFPN-32.","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~125°C(TA)","Supplier Device Package":"32-UFQFPN (5x5)","Voltage - Supply (Vcc/Vdd)":"2.95V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.2459","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/99a7192c520a3283640c68821053efb2.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM8S903K3U3/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to STM8S903K3U3 in this component family?","answer":"Within the STM8S903 series, devices with the same package and pinout differ mainly in Flash density. The STM8S903K3U3 carries 8 KB Flash; a higher-density sibling like the STM8S903F3 (8 KB, same pinout) or the STM8S903K3 (also 8 KB) may be cross-shopped. For a different Flash size in the same footprint, check the STM8S903x3/x6 variants — the datasheet's ordering information table lists the exact memory options."},{"question":"How to program STM8S903K3U3?","answer":"Programming uses ST's SWIM (Single Wire Interface Module) protocol, accessible through the SWIM pin. Standard tools include the ST-Link programmer/debugger and ST Visual Programmer software."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM8S903K3U3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM8S903K3U3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}