STM8S103K3U6
STM8S103K3U6 - 16MHz 8-Bit MCU with 8KB Flash | STMicroelectronics
The STMicroelectronics STM8S103K3U6 is an access-line 8-bit STM8S microcontroller operating up to 16 MHz, with 8 KB of Flash program memory and 16 I/O ports, packaged in a 32-pin UFQFPN. It operates from 2.95 V to 5.5 V and integrates a 10-bit ADC, three timers, UART, SPI, and I²C. This combination makes it suitable for compact embedded control, sensor acquisition, communication, and low-cost automation systems where an 8-bit architecture, peripheral integration, and a small surface-mount footprint are useful.
What is an 8-bit microcontroller? An 8-bit microcontroller is a compact embedded-processing device whose central processing unit, registers, data paths, and instruction handling are organized around eight-bit values. Within the broader semiconductor hierarchy, the STM8S103K3U6 is an MCU, then an embedded controller, then a general-purpose semiconductor used in control and communication products. The STM8S family combines program memory, RAM, data EEPROM, timers, serial interfaces, and analog conversion on one device.
The part provides 8 Kbytes of Flash program memory, 1 Kbyte of RAM as identified in the retrieved comparison data, and 640 bytes of true data EEPROM with 300 kcycles endurance. Its 16 MHz clock supports responsive control loops, while the 10-bit ADC enables measurements from analog sensors. The integrated UART, SPI, and I²C interfaces support external transceivers, memory, sensors, displays, and other digital peripherals without requiring separate interface controllers.
The STM8S103K3U6 is identified in the verified listing as a 32-pin UFQFPN device with an exposed pad and a 5 x 5 mm package description. The exposed pad and compact land pattern are important layout considerations because they influence thermal spreading, soldering, and assembly requirements. The device uses surface-mount construction, and the supplied search data identifies an operating supply range of 2.95 V to 5.5 V, allowing operation from either regulated 3.3 V or 5 V systems.
Typical applications include low-cost sensor nodes, small motor or actuator controllers, communication modules, industrial control panels, instrument interfaces, and compact consumer products. The ADC and serial interfaces make it practical for designs that acquire analog values and transmit or store measurements. Firmware selection must match the STM8S device family, and board-level validation should include power sequencing, peripheral pin multiplexing, clock configuration, ADC calibration behavior, and exposed-pad thermal design.
For a new design, choose the STM8S103K3U6 when 8 KB of Flash, 1 KB of RAM, a 16 MHz maximum clock, and integrated mixed-signal and serial peripherals are sufficient. It is not automatically interchangeable with a different STM8 device merely because the family name is similar; verify package pinout, memory size, voltage limits, peripheral assignments, and firmware support. This page combines verified distributor and manufacturer information with sourcing guidance, design cautions, and structured technical context.
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