STM8S003F3K6T6 Specifications for Compact Embedded Control

ElecSuppliers Part Number GuideAug 22, 2026

STM8S003F3K6T6 is an 8-bit STM8 microcontroller designed for general-purpose embedded control. It combines processing, memory, analog input, timing and communication functions in a single MCU, making it suitable for compact electronic control systems.

The device belongs to the STM8S003F3 family, a widely used group of value-line microcontrollers intended for applications where a straightforward controller is more appropriate than a larger and more complex MCU.

STM8S003F3K6T6 Main Specifications

STM8S003F3K6T6 uses an STM8 8-bit CPU operating at up to 16 MHz.

The MCU provides 8KB of Flash program memory and 1KB of RAM for application execution. Integrated data EEPROM can be used to store parameters that need to remain available after power is removed.

The peripheral set includes a 10-bit ADC, timers, GPIO and serial communication interfaces.

These functions allow the MCU to handle digital control, analog measurement and communication tasks without requiring separate devices for every function.

STM8S003F3K6T6 Flash and RAM

The 8KB Flash memory is suitable for firmware used in relatively compact embedded products.

Application code can include control algorithms, communication routines, sensor processing and peripheral management.

The 1KB RAM provides working memory for variables, stack operations and temporary data.

For applications with limited memory requirements, this combination can provide enough resources while keeping the controller architecture simple.

When firmware becomes more complex, developers should monitor Flash and RAM usage to avoid exceeding the available resources.

STM8S003F3K6T6 EEPROM

The integrated data EEPROM is useful for storing information that must survive a power cycle.

For example, an embedded product can store calibration values, configuration settings, operating thresholds or user-selected parameters.

Using internal non-volatile memory can eliminate the need for a separate EEPROM chip, which can reduce PCB component count.

This is particularly useful in compact control boards where board space and component cost need to be carefully managed.

STM8S003F3K6T6 ADC

The integrated 10-bit ADC allows STM8S003F3K6T6 to process analog signals.

It can interface with sensors and measurement circuits for applications such as voltage monitoring, temperature detection and analog control inputs.

The MCU can read an analog signal, process the result in firmware and then make a control decision.

For example, an analog input can be compared with a predefined threshold before activating an output or changing a PWM signal.

STM8S003F3K6T6 Timer and PWM Functions

Timers provide hardware support for accurate timing and signal generation.

STM8S003F3K6T6 can use timer peripherals for periodic interrupts, event timing, pulse measurement and PWM generation.

PWM is useful for controlling LED brightness, fan speed and other external loads through an appropriate driver circuit.

Timer-based control also allows the MCU to perform repetitive timing operations without relying entirely on software delay routines.

Communication Interfaces

STM8S003F3K6T6 supports common serial communication functions used in embedded systems.

UART can be used for communication with external modules or for system configuration and debugging.

SPI provides a convenient interface for displays, sensors, memory and other peripherals.

I²C can connect multiple compatible devices through a shared two-wire bus.

The availability of these interfaces allows the MCU to become the central controller of a small embedded system.

STM8S003F3K6T6 GPIO Control

GPIO pins allow the MCU to interact directly with external digital circuits.

They can be used for buttons, switches, LEDs, relays, sensors and control signals.

Some pins also provide alternative peripheral functions. This means the same physical pin may be assigned to GPIO, timer, ADC or communication functions depending on the system design.

Careful pin planning is therefore important when multiple peripherals are required simultaneously.

STM8S003F3K6T6 Applications

STM8S003F3K6T6 can be used in a variety of embedded products.

Common application areas include household appliances, industrial control boards, LED equipment, sensor modules, small automation systems, consumer electronics and power-control circuits.

It can also be used as a secondary controller in larger systems where a dedicated MCU is needed for monitoring or local control.

The integrated peripherals allow many of these functions to be implemented with a relatively small external circuit.

STM8S003F3K6T6 for Appliance Control

Household appliances often require a small MCU to manage buttons, indicators, sensors and control outputs.

STM8S003F3K6T6 can process user inputs, read analog sensors and control external switching circuits.

The timer peripherals can handle periodic operations, while communication interfaces can connect the MCU to other control modules.

For straightforward appliance-control functions, an 8-bit MCU can provide sufficient performance without unnecessary processing resources.

STM8S003F3K6T6 for Industrial Control

Small industrial control boards can also use the MCU for local monitoring and control.

The ADC can monitor analog signals, GPIO can handle digital inputs and outputs, and timers can provide accurate control timing.

UART, SPI and I²C provide options for communication with sensors, displays or other controllers.

For systems with more demanding real-time processing or advanced communication requirements, a higher-performance controller may be required.

STM8S003F3K6T6 for LED and Lighting Control

The MCU's GPIO and PWM capabilities make it suitable for programmable LED control.

PWM can adjust brightness or control an external LED driver.

The MCU can also process buttons, sensors or communication commands to determine the required lighting behavior.

This makes STM8S003F3K6T6 suitable for indicators, control panels and compact lighting-control electronics.

STM8S003F3K6T6 Replacement

When searching for an STM8S003F3K6T6 replacement, engineers should compare more than the MCU family name.

Important parameters include Flash capacity, RAM, EEPROM, operating voltage, GPIO count, ADC channels, timer configuration and communication interfaces.

The physical package must also match the existing PCB if a direct replacement is required.

Firmware compatibility is another important consideration because changes to clock configuration, peripheral registers or pin functions can require software modifications.

STM8S003F3K6T6 Package Considerations

The package version represented by the complete part number should be checked before PCB design or component replacement.

Different STM8S003F3 variants can use different package formats even when their basic MCU functions are similar.

This means that the last characters of the part number should not be ignored when sourcing a replacement.

A functionally similar device may still require a different PCB footprint if the package is not the same.

STM8S003F3K6T6 for Embedded Systems

STM8S003F3K6T6 combines an 8-bit STM8 processor with Flash, RAM, EEPROM, ADC, timers and communication interfaces.

Its feature set makes it suitable for embedded products that need straightforward control, analog monitoring and communication in a relatively simple hardware architecture.

For engineers evaluating this MCU, the most important selection factors are the required memory, I/O resources, analog inputs, timer functions, communication interfaces and package configuration.