Peripherals and I/O — what you get on 25 pins
Sourcing and lifecycle — still active, no end-of-life notice
This part is listed as Active. That means it's still a safe pick for new designs and production runs.
ST STM8S105K4U6ATR 8-Bit MCU, 16 MHz, 16 KB Flash, UFQFPN-32
MPNSTM8S105K4U6ATR
Active
STMicroelectronics STM8S105K4U6ATR, 8-Bit STM8 MCU, 16 MHz, 16KB Flash, 2K x 8 RAM, 1K x 8 EEPROM, 2.95V-5.5V, -40°C to 85°C, 32-UFQFPN (5x5).
$1.1485Ref. 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) |
| 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 | 16KB (16K x 8) |
Product details
Frequently asked questions
What is the operating temperature range of STM8S105K4U6ATR?
It's rated for -40°C to 85°C, which covers industrial and most outdoor applications without special screening.
What is the operating voltage of STM8S105K4U6ATR?
Supply range is 2.95 V to 5.5 V, so it works with both 3.3 V and 5 V systems directly.
Is STM8S105K4U6ATR compatible with STM8S105K4T6?
They share the same core, memory, and peripheral set; the T6 variant comes in a TQFP-32 package instead of UFQFPN. Electrically compatible, but the footprint differs.