STM8L151G6U3 - 16MHz 32KB Low-Power MCU | ST
MPN: STM8L151G6U3 ✓ ActiveSTM8L151G6U3 Overview
An ultra-low-power microcontroller, or ULP MCU, is an energy-efficient semiconductor designed to remain responsive while consuming minimal power during active operation, standby, and wake-up transitions. The STM8L151 belongs to the STM8L EnergyLite family within STMicroelectronics' broader hierarchy of 8-bit microcontrollers, embedded processors, and semiconductor devices. Its low-power architecture makes it suitable for battery-operated sensors, portable instruments, industrial controls, and connected products that spend substantial time waiting for events.
The STM8L151G6U3 provides 32 KB Flash, 2 KB of on-chip RAM, a 12-bit ADC, and a DAC according to the supplied manufacturer and distributor data. Its integrated peripheral set also includes an RTC, data EEPROM, timers, USART, I2C, SPI, comparators, and LCD support. These resources allow a compact design to sample analog inputs, maintain real-time information, communicate with sensors or external controllers, and drive a segment LCD without requiring several separate devices.
The enhanced STM8 CPU core operates at up to 16 MHz, providing up to 16 MIPS according to the manufacturer family information. The device combines a 28-pin 4 mm by 4 mm UFQFPN package with analog and serial-interface functions, enabling high component density in space-constrained products. Its exact peripheral configuration, current consumption, timing limits, and absolute electrical limits should be confirmed against the current STMicroelectronics datasheet before a production design is released.
Typical applications include low-energy environmental sensors, battery-powered measurement modules, compact industrial controllers, wearable accessories, smart-home endpoints, and small instrumentation products. For a sensor node, the ADC and timers can support periodic measurements while the RTC and low-power modes help control idle consumption. The USART, I2C, and SPI interfaces support external sensors, transceivers, memory, and host controllers, while LCD support is useful for local human-readable output.
A critical design consideration is supply-voltage headroom. The MCU operates from 1.8 V to 3.6 V, so battery chemistry, regulator dropout, transient response, and brownout behavior must be evaluated together. Decoupling capacitors should be placed close to the supply pins, unused inputs should be configured appropriately, and low-power modes should be validated with the intended peripheral states rather than only with the core active.
This page consolidates verified manufacturer and distributor information, package and interface guidance, pricing context, and practical application analysis. It also distinguishes documented functions from parameters that require confirmation from the manufacturer datasheet, supporting faster engineering comparison without treating unverified alternatives as drop-in replacements.
Drop-in alternatives for STM8L151G6U3 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with STM8L151G6U3 (same form factor and footprint) — differing in Comparators, Package.
No drop-in alternatives available for this product.
Request AlternativesSTM8L151G6U3 Maximum Ratings & Electrical Characteristics
| Product Type | Ultra-low-power 8-bit microcontroller |
| CPU Maximum Frequency | 16 MHz |
| Flash Memory | 32 KB (32K x 8) |
| On-Chip RAM | 2 KB |
| Data EEPROM | 1 KB |
| Supply Voltage Range | 1.8 V to 3.6 V |
| ADC Resolution | 12-bit |
| DAC Resolution | 12-bit |
| Real-Time Clock | Integrated |
| Serial Interfaces | USART, I2C, and SPI |
| Timers | Integrated |
| Comparators | Integrated |
| LCD Support | Supported |
| Package | 28-UFQFPN, 4 mm x 4 mm |
| Pin Count | 28 pins |
| Lifecycle Status | Active |
STM8L151G6U3 28-ufqfpn, 4 mm x 4 mm Pin Configuration Guide
Pin configuration for STM8L151G6U3 (28-ufqfpn, 4 mm x 4 mm package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for STM8L151G6U3.
Refer to the datasheet for full pin configuration.
Typical Applications
STM8L151G6U3 is suitable for 6 applications: Battery-Powered Environmental Sensors, Compact Industrial Measurement Modules, Smart-Home and IoT Endpoints, Portable Medical and Wellness Devices, Local LCD Instrument Panels, Low-Energy Wearable Accessories.
Battery-Powered Environmental Sensors
The STM8L151G6U3 fits compact environmental sensors because its ultra-low-power STM8L architecture operates from 1.8 V to 3.6 V while providing a 16 MHz clock, 32 KB Flash, and a 12-bit ADC. A sensor node can acquire analog measurements, apply filtering, and schedule samples using the integrated timers and RTC before entering a low-power state between readings. USART, I2C, and SPI permit connection to humidity, temperature, pressure, or particulate sensors without excessive bus overhead. The principal design trade-off is that battery life depends on the exact standby, sleep, and active current figures, which were not present in the supplied verified data.
Recommended
Compact Industrial Measurement Modules
The STM8L151G6U3 is suitable for industrial measurement modules that combine analog acquisition with limited enclosure space. Its 12-bit ADC handles sensor conditioning, while the integrated DAC can support stimulus generation or output reference functions. The 16 MHz CPU and 32 KB Flash provide room for calibration, filtering, diagnostics, and communication firmware, and the 1.8 V to 3.6 V range simplifies low-voltage sensor interfaces. For factory-connected equipment, the industrial system must still address ESD protection, surge immunity, calibration, watchdog behavior, and ground integrity beyond the MCU's verified electrical specifications.
Recommended
Smart-Home and IoT Endpoints
The STM8L151G6U3 supports small smart-home endpoints where a full 32-bit processor may be unnecessary. Its 32 KB Flash and 2 KB RAM can hold compact control logic, while USART, I2C, and SPI provide practical connectivity to radio modules, sensors, displays, and EEPROMs. The 28-pin 4 mm by 4 mm UFQFPN package reduces PCB footprint in wall controllers, appliance interfaces, and distributed sensing nodes. RTC support can improve timestamped event handling, and the 1.8 V minimum supply is useful for low-energy designs, although radio-module current and standby behavior will dominate the final system power budget.
Recommended
Portable Medical and Wellness Devices
The STM8L151G6U3 can serve as the control device in compact wellness or medical-adjacent monitoring products where low power and mixed-signal integration are important. Its 12-bit ADC supports physiological or environmental measurements, and its DAC provides an adjustable analog output where required. With 32 KB Flash and integrated RTC, firmware can perform baseline calculation, event logging, and control of indicators or simple user interfaces. Because the supplied data does not identify medical qualification, electrical safety certification, or specific leakage-current limits, this use requires separate medical-device validation and must not be interpreted as a certified clinical solution.
Recommended
Local LCD Instrument Panels
The STM8L151G6U3 is appropriate for small instrument panels that combine an LCD, local controls, and serial communications. Its LCD support, timers, comparators, and 32 KB Flash allow measurement, display updating, and menu logic to be consolidated in one MCU. I2C or SPI can connect a display or external memory, while USART supports configuration from a host computer. The 28-pin 4 mm by 4 mm UFQFPN package assists enclosure miniaturization, but designers must verify segment count, glass-drive requirements, operating current, and display timing against the exact package variant and datasheet.
Recommended
Low-Energy Wearable Accessories
The STM8L151G6U3 is well suited to wearable accessories that monitor movement or environmental conditions while remaining small and power-conscious. The 16 MHz MCU can process data from integrated or external sensors, and the RTC, timers, and low-power STM8L family position support periodic measurement and event-driven wake-up. Its 2 KB RAM and 32 KB Flash are sufficient for lightweight algorithms and communication buffering, but not for demanding graphical workloads. Electrode leakage, motion-sensor supply requirements, radio power, and battery safety must be evaluated separately because those values were not included in the verified product data.
Recommended
Recommended Products Summary
Engineering reference data for STM8L151G6U3 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 28-UFQFPN, 4 mm x 4 mm |
| Brand | STMicroelectronics |
| Product Type | Ultra-low-power 8-bit microcontroller |
| Maximum Clock Frequency | 16 MHz |
| Flash Memory | 32 KB |
| RAM | 2 KB |
| Supply Voltage Range | 1.8 V to 3.6 V |
| ADC and DAC Resolution | 12-bit ADC and 12-bit DAC |
| Integrated Interfaces | USART, I2C, SPI, RTC, timers, comparators, and LCD support |
| Lifecycle Status | Active |
Key Differentiators
- Mixed-signal integration in a compact package (vs STM8L152K6U6)
- Low-power 8-bit processing with a 16 MHz clock (vs STM8L151G6U3TR)
- Direct fit for existing 28-pin STM8L151G6 layouts (vs STM8L152K6U6)
Design Notes
Design the 1.8 V to 3.6 V supply for the MCU and its attached sensors together. Battery regulation, transient response, and peripheral current can create disturbances that do not appear when the core is evaluated in isolation. Place the required bypass capacitor close to the supply pins, provide a low-impedance ground return, and measure droop during ADC conversion, radio transmission, and display updates. Specific capacitor values and low-power current figures were not present in the supplied data and must be obtained from the manufacturer datasheet.
Route analog inputs away from fast digital clock, SPI, and switching-supply nodes to reduce coupled noise in the 12-bit conversion path. Keep the UFQFPN exposed-pad connection consistent with the manufacturer's land pattern and thermal guidance. Because no authoritative pin-by-pin list was supplied, do not infer analog-pin positions from a generic QFN drawing; cross-check every analog, supply, ground, reset, and debug connection against the current STMicroelectronics package documentation before releasing the PCB.
Do not treat related STM8L151 order codes as automatically interchangeable. The verified records distinguish STM8L151G6U3 from STM8L151G6U3TR, while the comparison material associates STM8L152K6U6 with a 32-pin UFQFPN rather than the target's 28-pin package. Package suffixes can encode pin count, temperature range, and reel or tray delivery method. Confirm the ordering table, footprint, pin names, and firmware-supported device identity before substituting a suffix or related-family MPN.
Use the RTC and timers to structure periodic measurements, but enter low-power modes only after disabling or placing external peripherals into their intended states. An MCU can appear efficient while a sensor, pull-up network, indicator, or interface transceiver continues drawing current. Estimate average consumption from each peripheral's operating state and compare it with the battery's usable capacity. The supplied sources confirm the low-power product positioning but do not provide the active, sleep, and standby current values required for a defensible battery-life calculation.
Compliance Information
The supplied verified data confirms an active lifecycle status but does not extract RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. These fields remain unknown rather than being inferred from the manufacturer or package.
