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Product attributes Property Value
Manufacturer STMicroelectronics
Product Series STM8S
Packaging Tray | NULL
Core Processor STM8
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 28
Program Memory Size 8KB (8K x 8)
Program Memory Type FLASH
EEPROM Size 640 x 8
RAM Size 1K x 8
Voltage - Supply (Vcc/Vdd) 2.95V ~ 5.5V
Data Converters A/D 7x10b
Oscillator Type Internal
Operating Temperature -40°C ~ 85°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 STM8S903K3U6 is an 8-bit microcontroller from STMicroelectronics featuring the STM8 core. It runs at 16MHz and provides 8KB of flash memory and 1KB of RAM. With a supply voltage range of 2.95V to 5.5V, it includes brown-out detection, power-on reset, PWM, and a watchdog timer. The 32-UFQFN package makes it suitable for space-limited applications requiring robust performance.

  • Robust protection features: BOR and POR ensure safe operation during power-up and brown-out conditions.
  • High-speed PWM: Enables precise control in motor and lighting applications.
  • Wide temperature range: -40°C to 85°C supports industrial environments.
  • Cost-effective 8-bit solution: Balances performance and cost for high-volume products.

Automotive Body Electronics

Use in window lift or mirror control modules. The 16MHz core and PWM outputs handle DC motor speed regulation efficiently.

Industrial Sensors

Process analog signals from pressure or temperature sensors. The integrated ADC and 5V operation simplify sensor conditioning.

Battery-Powered Tools

Manage brushless DC motors in cordless drills. The low-voltage detection (BOR) protects against deep discharge.

Smart Lighting

Control LED dimming in architectural lighting. The PWM timers provide smooth brightness control without external DACs.

Security Systems

Implement keypad scanning and alarm logic in access control panels. The WDT ensures the system recovers from transient faults.

Medical Monitoring

Use in portable pulse oximeters or thermometers. The small UFQFN package fits compact handheld designs.

Q: What is the core architecture of the STM8S903K3U6?
A: It uses the STM8 8-bit core running at up to 16MHz.
Q: What is the memory configuration?
A: It has 8KB of program flash and 1KB of RAM.
Q: What is the supply voltage range?
A: It operates between 2.95V and 5.5V.
Q: What package options are available?
A: This part is offered in a 32-UFQFN exposed pad package.
Base Product Number : STM8S903K3U6
16MHz 1KB RAM 8-bit MCU 8KB Flash Automotive Industrial PWM STM8 STM8S903K3U6 UFQFN-32 WDT
Q: What is the core architecture of the STM8S903K3U6?
A: It uses the STM8 8-bit core running at up to 16MHz.
Q: What is the memory configuration?
A: It has 8KB of program flash and 1KB of RAM.
Q: What is the supply voltage range?
A: It operates between 2.95V and 5.5V.
Q: What package options are available?
A: This part is offered in a 32-UFQFN exposed pad package.