{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM8S903K3U3TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM8S903K3U3TR","canonicalUrl":"https://icboms.com/stmicroelectronics/STM8S903K3U3TR","factsUrl":"https://icboms.com/api/mcp/products/STM8S903K3U3TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM8S903K3U3TR, STM8S series, 8-bit MCU, 16 MHz, 8 KB Flash, 1K x 8 RAM, 640 x 8 EEPROM, 28 I/O, 2.95 V ~ 5.5 V, -40°C ~ 125°C, 32-UFQFN exposed pad.","salesMarkdown":"## 8-bit MCU with integrated EEPROM for parameter storage The STM8S903K3U3TR is an 8-bit microcontroller from STMicroelectronics' STM8S value line, built around the STM8 core clocked at 16 MHz. The wide supply range of 2.95 V to 5.5 V and an industrial temperature grade from -40°C to 125°C make it a fit for motor drives, sensor nodes, and automotive body-control modules that must survive under-hood ambient temperatures. ## 16 MHz core and 8 KB Flash — sizing the firmware budget At 16 MHz the STM8 core delivers roughly 16 MIPS for register-to-register operations, enough for 8-bit control loops, UART polling, or simple sensor conditioning. ## Package and thermal: 32-UFQFPN with exposed pad Housed in a 32-lead UFQFPN measuring 5x5 mm with an exposed thermal pad, this package demands a PCB land pattern with a central via array for solder paste outgassing and thermal conduction. The pad must be connected to a ground plane for effective heat spreading; without it, junction temperature rises quickly under continuous 16 MHz operation at 125°C ambient. The 28 general-purpose I/O are 5 V tolerant, so level shifting is unnecessary when interfacing with 5 V peripherals.","metaTitle":"ST STM8S903K3U3TR 8-Bit MCU, 16 MHz, 8 KB Flash, UFQFPN-32","metaDescription":"STMicroelectronics STM8S903K3U3TR 8-bit MCU with 16 MHz STM8 core, 8 KB Flash, 1 KB RAM, 640 B EEPROM. -40°C to 125°C, 2.95 V to 5.5 V supply. Sourced to order against RFQ.","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":"Tape & Reel (TR)","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/STM8S903K3U3TR/alternatives.json"},"ai":{"faq":[{"question":"What package does STM8S903K3U3TR come in?","answer":"It comes in a 32-lead UFQFN exposed pad package, also referred to as 32-UFQFPN, with a 5x5 mm body."},{"question":"How many I/O pins does STM8S903K3U3TR have?","answer":"The device provides 28 general-purpose I/O pins."},{"question":"What is STM8S903K3U3TR's core speed?","answer":"The STM8 core runs at 16 MHz."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM8S903K3U3TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM8S903K3U3TR 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}}