STMicroelectronics STM8S105K6U3A

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Product attributes Property Value
Manufacturer STMicroelectronics
Product Series STM8S
Packaging Tray | NULL
Core Processor STM8A
Core Size 8-Bit
Speed 16MHz
Connectivity I2C, IrDA, LINbus, SPI, UART/USART
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Number of I/O 25
Program Memory Size 32KB (32K x 8)
Program Memory Type FLASH
EEPROM Size 1K x 8
RAM Size 2K x 8
Voltage - Supply (Vcc/Vdd) 2.95V ~ 5.5V
Data Converters A/D 7x10b
Oscillator Type Internal
Operating Temperature -40°C ~ 125°C (TA)
Grade -
Qualification AEC -
Mounting Type Surface Mount
Supplier Device Package 32-UFQFPN (5x5)
Package / Case 32-UFQFN Exposed Pad
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY

The STM8S105K6U3A from STMicroelectronics is a high-reliability 8-bit MCU built on the STM8A core. It delivers 16 MHz performance with 32KB flash and 2KB RAM. The device integrates brown-out detection, POR, PWM, and WDT, ensuring robust operation in industrial and automotive settings. Its 2.95V to 5.5V supply range and wide temperature tolerance make it a versatile choice for demanding embedded control.

  • Extended temperature range (-40°C to 125°C) – verified for automotive and industrial stress conditions.
  • Integrated WDT and brown-out reset – prevents system corruption during power glitches.
  • 16 MHz STM8A core – efficient 8-bit processing with low interrupt latency.
  • 5.5V tolerant supply – simplifies direct connection to unregulated power sources.

Industrial Sensor Nodes

With a 16 MHz STM8A core and 32KB flash, it can handle sensor fusion algorithms while maintaining low power in 2.95V-5.5V systems.

Automotive Body Control Modules

The -40°C to 125°C range and robust brown-out reset make it reliable for door locks, window lifts, and lighting control.

Power Tool Controllers

PWM outputs and WDT ensure safe motor commutation and fault recovery in high-vibration environments.

Smart Meters

2K RAM and 32KB flash are sufficient for metrology calculations and communication protocol stacks.

HVAC Actuators

Integrated POR and WDT prevent lockups in valve and damper control loops, ensuring fail-safe operation.

Portable Medical Monitors

The 5.5V max supply allows direct battery connection, while the small UFQFN package fits wearable form factors.

Q: What is the operating voltage range of the STM8S105K6U3A?
A: It operates from 2.95V to 5.5V, making it suitable for industrial and automotive power rails.
Q: What is the maximum clock speed?
A: The core runs at up to 16 MHz, providing balanced performance for control applications.
Q: Does it include a watchdog timer?
A: Yes, it features a WDT along with POR and brown-out reset for reliable operation.
Q: What package is available?
A: It comes in a 32-UFQFN exposed pad package, ideal for compact PCB designs.
Q: What is the temperature range?
A: It is rated for -40°C to 125°C, suitable for harsh environments.
Base Product Number : STM8S105K6
16MHz 32KB flash 8-bit MCU automotive brown-out reset industrial PWM STM8A UFQFN-32 WDT
Q: What is the operating voltage range of the STM8S105K6U3A?
A: It operates from 2.95V to 5.5V, making it suitable for industrial and automotive power rails.
Q: What is the maximum clock speed?
A: The core runs at up to 16 MHz, providing balanced performance for control applications.
Q: Does it include a watchdog timer?
A: Yes, it features a WDT along with POR and brown-out reset for reliable operation.
Q: What package is available?
A: It comes in a 32-UFQFN exposed pad package, ideal for compact PCB designs.
Q: What is the temperature range?
A: It is rated for -40°C to 125°C, suitable for harsh environments.