STMicroelectronics STM8S105K6U6A, 8-bit STM8 core MCU, 16 MHz, 32 KB Flash, 2K x 8 RAM, 1K x 8 EEPROM, 25 I/O, I²C/SPI/UART/LIN, 7x10b ADC, -40°C to 85°C, 32-UFQFPN (5x5 mm).
| 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 | 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 |
| Number of i (O) | 25 |
| Core processor | STM8 |
| Case | 32-UFQFN Exposed Pad |
| Data converters | A/D 7x10b |
| Program memory size | 32KB (32K x 8) |
On-chip peripherals include a 7-channel 10-bit ADC, brown-out detect and power-on reset, PWM outputs, and a watchdog timer. The 25 general-purpose I/O pins are enough to handle a keypad, a small character display, and a few discrete sensors without an external port expander.
The small footprint suits space-constrained PCBs in compact enclosures.
The primary difference is program memory density: the STM8S105K6U6A has 32 KB of Flash, while the STM8S105K4U6A has 16 KB. Both share the same 16 MHz STM8 core, 2 KB RAM, 1 KB EEPROM, peripheral set, and 32-UFQFPN package — so they are pin-compatible and differ only in firmware storage capacity. Choose the K6 variant when the code image exceeds the 16 KB limit.