STM8L151K6U3
STM8L151K6U3 - 16MHz 32KB Ultra-Low-Power MCU | STMicroelectronics
The STMicroelectronics STM8L151K6U3 is an ultra-low-power 8-bit microcontroller with a 16 MHz core, 32 KB Flash memory, and a 32-pin 5 mm × 5 mm UFQFPN package. The verified distributor listing identifies the device as an STM8L EnergyLite MCU with 32 KB Flash, while the manufacturer positions the STM8L151K6 family as part of the STM8L ultra-low-power 8-bit portfolio. It combines an 8-bit CPU with embedded analog and serial peripherals for compact control, sensing, communications, and low-duty-cycle embedded products.
An ultra-low-power microcontroller is an embedded semiconductor designed to complete control tasks while minimizing energy consumption between active processing intervals. In the system hierarchy, the STM8L151K6U3 belongs to the microcontroller class, within embedded processors and power-conscious embedded control. Its combination of Flash program memory, data EEPROM, real-time-clock capability, LCD support, timers, USART, I2C, SPI, ADC, DAC, and comparators allows one device to consolidate several discrete functions on a small PCB.
Verified feature information identifies up to 32 KB Flash, 1 KB data EEPROM, RTC, LCD, timers, USART, I2C, SPI, ADC, DAC, and comparators. The distributor record also confirms 8-bit operation, a 16 MHz maximum frequency, and 32 KB organized as 32K × 8. These resources suit firmware that includes user-interface updates, sensor acquisition, local data logging, communication, timekeeping, and low-power state management without requiring a separate real-time clock or interface-conversion circuitry.
The STM8L151K6U3 belongs to STMicroelectronics' STM8L low-power architecture rather than the ARM-based STM32 families. That distinction matters when replacing it: software, instruction set, peripheral implementation, and toolchain assumptions may differ even when another microcontroller offers similar nominal features. ST's product page identifies the medium-density STM8L151x4/6 devices, allowing engineers to distinguish the target from lower-density STM8L151x2/3 parts when planning a redesign.
Typical applications include battery-powered utility meters, compact environmental sensors, industrial control modules, wearable accessories, instrument panels, and connected sensor nodes. The target's integrated ADC and comparators suit local analog monitoring, while USART, I2C, and SPI support external sensors, transceivers, displays, and data loggers. The RTC is useful for time-stamped measurements and scheduled low-power operation, although exact current, voltage, timer, ADC, and package-registration details must be taken from the manufacturer documentation.
PCB implementation should follow the exact 32-pin UFQFPN land pattern and exposed-pad requirements in the manufacturer package information. Place decoupling capacitors close to supply pins, route sensitive analog inputs away from fast-switching nodes, and confirm thermal-pad soldering against the assembly process. Firmware and peripheral configuration should also use STMicroelectronics' STM8 toolchain rather than assuming STM32 compatibility.
This product record combines verified manufacturer positioning, distributor specifications, sourcing links, interface coverage, and replacement-risk guidance. It is intended to accelerate engineering evaluation while clearly separating confirmed facts from parameters that still require confirmation from the official datasheet.
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