{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STM8S105K6U3ATR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STM8S105K6U3ATR","canonicalUrl":"https://icboms.com/stmicroelectronics/STM8S105K6U3ATR","factsUrl":"https://icboms.com/api/mcp/products/STM8S105K6U3ATR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STM8S105K6U3ATR, STM8S series 8-bit MCU, 16MHz, 32KB Flash, 2Kx8 RAM, 1Kx8 EEPROM, 7x10b ADC, I²C/SPI/UART/LIN, 2.95V-5.5V, -40 to 125°C, 32-UFQFN Exposed Pad.","salesMarkdown":"## STM8S105K6U3ATR — 8-bit MCU in a 5x5 mm UFQFN for space-constrained industrial control The STMicroelectronics STM8S105K6U3ATR is an 8-bit microcontroller from the STM8S series, built around the STM8 core running at 16 MHz. On-chip peripherals include a 7-channel 10-bit ADC, brown-out detect and reset, PWM, and a watchdog timer. ## Memory and peripheral fit — what the 32 KB / 2 KB / 1 KB split means for your BOM The 32 KB Flash (32K x 8) is the primary firmware store. For a typical motor-control or sensor-fusion application, that holds a modest RTOS kernel, communication stacks (LIN, Modbus over UART), and application code with room to spare. The 2 KB SRAM is the working memory — enough for a few 100-byte buffers and a small call stack. The 1 KB EEPROM is the key differentiator versus cheaper MCUs that require external EEPROM or emulate it in Flash: you can store calibration coefficients, fault logs, or configuration parameters directly, with no wear-leveling overhead at this density. The 7-channel 10-bit ADC covers analog inputs like potentiometers, current shunts, or NTC thermistors. If your design needs more than 7 analog inputs or 10-bit resolution, an external ADC or a larger MCU in the STM8S family would be the next step. ## Package and thermal — UFQFN with exposed pad The 32-UFQFN (5x5 mm) with exposed pad is a compact, low-profile package suited for dense PCBs. The mounting type is surface mount, so reflow profiling should follow ST's recommendations for the UFQFPN family. ## Lifecycle — confirmed active production STMicroelectronics lists the STM8S105K6U3ATR as Active.","metaTitle":"ST STM8S105K6U3ATR 8-bit MCU, 16 MHz, 32 KB Flash","metaDescription":"STMicroelectronics STM8S105K6U3ATR 8-bit MCU: 16 MHz core, 32 KB Flash, 2 KB RAM, 1 KB EEPROM, 7x10b ADC, I²C/SPI/UART/LIN, -40 to 125°C, 32-UFQFN.","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":"2K x 8","Core Size":"8-Bit","EEPROM Size":"1K 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":"25","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":"32KB (32K 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":"$1.5401","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/144035a892bf69a3b9c486b66dee32df.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STM8S105K6U3ATR/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative in the STM8S family?","answer":"Within the STM8S105xx line, the density variants (e.g., STM8S105K4 with 16 KB Flash or STM8S105K6 with 32 KB Flash) share the same 32-UFQFPN footprint and pinout. Moving up to the STM8S207 or STM8S208 series would change the package and peripheral set. For a direct pin-compatible drop-in with the same memory map, check the STM8S105K6T6C (LQFP-32) if you need a larger package for manual assembly or rework."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STM8S105K6U3ATR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STM8S105K6U3ATR 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}}