{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM8S903F3U3TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM8S903F3U3TR","canonicalUrl":"https://icboms.com/stmicroelectronics/STM8S903F3U3TR","factsUrl":"https://icboms.com/api/mcp/products/STM8S903F3U3TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM8S903F3U3TR, 8-bit STM8 core MCU, 16 MHz, 8 KB Flash, 1K x 8 RAM, 640 x 8 EEPROM, 2.95V–5.5V supply, -40°C to 125°C, 20-UFQFPN (3x3 mm), Tape & Reel.","salesMarkdown":"## 16 MHz 8-bit MCU in a 3x3 mm package The 20-pin UFQFPN package (3x3 mm) saves board area for space-constrained designs like sensor modules or small motor drives. On-chip peripherals include a 10-bit ADC with five channels, a PWM timer, and a watchdog timer. The 8 KB Flash and 1 KB RAM limit firmware complexity — a full CANopen or Modbus stack will exceed this budget. It fits best as a dedicated I/O controller, LIN slave, or a simple PWM generator where the code stays under a few kilobytes. Listed as Active — no last-time-buy or NRND flags. For dual-sourcing resilience, ST's STM8S family includes several pin-compatible density variants (e.g., 16 KB and 32 KB Flash options in the same UFQFPN-20 footprint), though the exact order code should be validated against the BOM.","metaTitle":"STM8S903F3U3TR 8-bit MCU, 16 MHz, 8 KB Flash, UFQFPN-20","metaDescription":"STMicroelectronics STM8S903F3U3TR 8-bit MCU with 16 MHz core, 8 KB Flash, 1 KB RAM, 640 B EEPROM, -40°C to 125°C, UFQFPN-20.","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":"16","Core Processor":"STM8","Package / Case":"20-UFQFN","Product Status":"Active","Data Converters":"A/D 5x10b","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":"20-UFQFPN (3x3)","Voltage - Supply (Vcc/Vdd)":"2.95V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.1063","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/99a7192c520a3283640c68821053efb2.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM8S903F3U3TR/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the STM8S903F3U3TR?","answer":"Within the STM8S family, the STM8S903F3 shares the same UFQFPN-20 footprint and pinout as other STM8S903x3 variants. For higher memory, the STM8S903K3 (32 KB Flash) is pin-compatible, though the exact order code should be cross-checked for peripheral differences."},{"question":"How to program the STM8S903F3U3TR?","answer":"Programming is done via the SWIM (Single Wire Interface Module) protocol, supported by ST's ST-Link/V2 programmer and the STVD or STVP toolchain."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM8S903F3U3TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM8S903F3U3TR 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}}