The STMicroelectronics STM8S903K3U6TR is an 8-bit microcontroller from the STM8S family, built around the STM8 core running at 16 MHz. The 28 I/O pins in a 32-UFQFPN package (5x5 mm, exposed pad) keep board area tight, and the internal oscillator eliminates a crystal for many designs.
ST STM8S903K3U6TR 8-bit MCU, 16MHz, 8KB Flash, 32-UFQFPN
MPNSTM8S903K3U6TR
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STMicroelectronics STM8S903K3U6TR, STM8S series 8-bit MCU, 16MHz core, 8KB Flash, 1K x 8 RAM, 640 x 8 EEPROM, 2.95V-5.5V supply, -40°C to 85°C, 32-UFQFPN (5x5).
$2.3100Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Series | STM8S |
| Mounting | Surface Mount |
| Oscillator type | Internal |
| Program memory type | FLASH |
| Voltage - supply (Vcc (Vdd)) | 2.95V ~ 5.5V |
| Operating temperature | -40°C~85°C(TA) |
| Speed | 16MHz |
| 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 |
| Number of i (O) | 28 |
| Core processor | STM8 |
| Case | 32-UFQFN Exposed Pad |
| Data converters | A/D 7x10b |
| Program memory size | 8KB (8K x 8) |
Product details
Frequently asked questions
What is the datasheet for STM8S903K3U6TR?
Buyers need detailed specs, pinout, and electrical characteristics to validate fit in a design.
Where to buy STM8S903K3U6TR in stock?
Sourcing buyers prioritize immediate availability to avoid production delays.
What is the price of STM8S903K3U6TR?
Budgeting and BOM cost analysis depend on accurate current pricing.
What is the equivalent or replacement for STM8S903K3U6TR?
Engineers and maintenance techs need drop-in alternatives for design flexibility or when parts are unavailable.
Is STM8S903K3U6TR RoHS compliant?
Regulatory compliance is mandatory for many markets and industries.
How to program STM8S903K3U6TR?
Developers need to know compatible tools and interfaces to integrate the microcontroller.