STMicroelectronics STM8S103K3U6, 8-bit STM8 core MCU, 16 MHz, 8 KB Flash, 1K x 8 RAM, 640 x 8 EEPROM, 28 I/O, I²C/SPI/UART, 2.95V–5.5V, -40°C to 85°C, 32-UFQFPN.
| 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 | Tray |
| 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 4x10b |
| Program memory size | 8KB (8K x 8) |
The wide supply range from 2.95 V to 5.5 V lets it drop into existing 5 V industrial buses or 3.3 V battery-powered designs without a level shifter on every I/O.
On-chip peripherals include a 10-bit ADC with four channels, a PWM timer, brown-out reset, and a watchdog — enough to run a BLDC sensorless commutation loop or a Modbus RTU slave without external glue logic.
Yes. The supply voltage range of 2.95 V to 5.5 V means the I/O pins are 5 V-tolerant when the MCU is powered at 5 V. No external level translator is needed for 5 V peripherals like a classic 74HC logic gate or an HD44780 LCD.
Within the STM8S family, the STM8S103F3 series offers a smaller pin-count package (20-pin TSSOP) with the same core and memory, while the STM8S105 series steps up to 16 KB Flash and more I/O. Both are pin-compatible across the same package options where the pin count matches.