{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM8S903F3M6TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM8S903F3M6TR","canonicalUrl":"https://icboms.com/stmicroelectronics/STM8S903F3M6TR","factsUrl":"https://icboms.com/api/mcp/products/STM8S903F3M6TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM8S903F3M6TR, STM8S series 8-bit MCU, 16 MHz, 8 KB Flash, 1K x 8 RAM, 640 x 8 EEPROM, 20-SOIC (7.50mm width), -40°C to 85°C, 2.95 V to 5.5 V supply.","salesMarkdown":"## 16 MHz 8-bit MCU with integrated EEPROM and flexible peripherals The STMicroelectronics STM8S903F3M6TR is an 8-bit microcontroller from the STM8S family, built around the STM8 core running at 16 MHz. On-chip peripherals include a 5-channel 10-bit ADC, PWM timers, a watchdog timer (WDT), and brown-out detect/reset (BOR/POR). ## Memory sizing — 8 KB Flash, 1 KB RAM, 640 B EEPROM With 8 KB of Flash and 1 KB of RAM, this part targets firmware footprints typical of simple control loops, state machines, and communication protocol stacks (e.g., LIN slave, I²C sensor hub). The 640-byte EEPROM is rated for 100k erase/write cycles per byte (per STM8S datasheet typical), allowing field-updatable parameters without wearing out the Flash. If the application needs more than 1 KB of runtime data memory, consider moving to a higher-RAM STM8S variant or adding external SRAM. ## 20-SOIC package — footprint and assembly notes The 20-SO supplier package code (20-SO) indicates the standard wide SOIC footprint. No exposed thermal pad — junction-to-ambient thermal resistance is managed through the package leads and PCB copper pour.","metaTitle":"ST STM8S903F3M6TR 8-bit MCU, 16 MHz, 8 KB Flash, 20-SOIC","metaDescription":"STMicroelectronics STM8S903F3M6TR 8-bit STM8 MCU: 16 MHz core, 8 KB Flash, 1 KB RAM, 640 B EEPROM, 5x10-bit ADC, I²C/SPI/UART, -40°C to 85°C, 20-SOIC.","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); Cut Tape (CT)","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-SOIC (0.295\\\", 7.50mm Width)","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~85°C(TA)","Supplier Device Package":"20-SO","Voltage - Supply (Vcc/Vdd)":"2.95V ~ 5.5V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.3700","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/99a7192c520a3283640c68821053efb2.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM8S903F3M6TR/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between STM8S903F3 and STM8S903K3?","answer":"The key difference is package and pin count. The STM8S903F3M6TR comes in a 20-pin SOIC package (20-SOIC), while the STM8S903K3 variant typically uses a 32-pin LQFP or QFN package. The 32-pin version offers more I/O pins and may include additional peripheral pins (e.g., extra ADC channels or a second UART), but the core, Flash, RAM, and EEPROM sizes are identical. The 20-pin part is the compact option for space-constrained designs."},{"question":"What is the substitute for STM8S903F3M6TR?","answer":"No official pin-compatible substitute is listed in the manufacturer's cross-reference. Within the STM8S family, the STM8S903K3 (32-pin) shares the same core and memory but has a different footprint. For a drop-in replacement, evaluate the STM8S003F3 (20-pin, lower Flash/RAM) or STM8S005C6 (48-pin, larger memory) — but each requires a firmware port and pinout check. No second-source vendor offers a direct pin-compatible alternate for this exact order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM8S903F3M6TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM8S903F3M6TR 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}}