STMicroelectronics STM8L151G4U3

Overview

STM8L151G4U3 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 16 MHz STM8 core, 16 KB Flash, 1 KB data EEPROM with ECC, 2 KB RAM, 12-bit ADC (1 Msps, 25 channels), 12-bit DAC, RTC with BCD calendar, and up to 28 I/Os in UFQFPN28 package - deployed in battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L151G4U3 datasheet, STM8L151G4U3 pinout, STM8L151G4U3 application, or STM8L151G4U3 equivalent, key selection criteria include ultra-low-power operation down to 350 nA in Halt mode, 1.65–3.6 V supply range, integrated capacitive touch sensing (up to 16 channels), and SWIM-based non-intrusive debugging support.

Technical Context

The STM8L151G4U3 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. It integrates dual clock domains: high-speed (1–16 MHz HSE or 16 MHz factory-trimmed HSI) and low-power (32 kHz LSE or 38 kHz LSI), enabling dynamic clock gating across peripherals.

Its power architecture supports five distinct low-power modes - including Active-halt (1.3 µA with full RTC) and Halt (350 nA) - with fast 4.7 µs wake-up from Halt. All I/Os exhibit ultra-low leakage (50 nA typical), and memory includes ECC-protected Flash and RWW-capable EEPROM.

Key Specifications

Pinout & Package

STM8L151G4U3 is housed in a 28-pin Ultra Thin Fine Pitch Quad Flat No-lead (UFQFPN28) package, 4 × 4 mm body, 0.5 mm pitch, with exposed thermal pad. Pinout validated per STMicroelectronics DS6372 Rev 17, Table 5 (Medium-density STM8L151x4/6 pin description) and Figure 5 (STM8L151Gx UFQFPN28 package pinout).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM8L051F3P6, STM8L151G4U3 adds DAC, capacitive sensing, and larger memory - critical for analog-rich edge nodes. Versus STM32L011K4T6, it delivers identical ultra-low-power performance with lower gate count, simpler toolchain, and native SWIM debug - advantageous for cost-constrained, deeply embedded designs.

Availability

STM8L151G4U3 is available at Aetrix Electronics and suitable for battery-powered sensor nodes, portable medical monitors, and industrial data loggers requiring stable component supply across multi-year production cycles.

Supply support for STM8L151G4U3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM8L ultra-low-power MCU product line targets energy-constrained applications demanding sub-microamp sleep currents, integrated analog peripherals, and long-life battery operation - especially in smart metering, wearables, and IoT edge nodes.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM8L151G4U3 operates up to 16 MHz with a typical active current of 195 µA/MHz plus 440 µA base consumption at 3.0 V. At full speed (16 MHz), total Run mode current is approximately 3.56 mA, verified per DS6372 Rev 17 Table 20. This includes core, Flash, and peripheral activity under standard load conditions.

Does STM8L151G4U3 support hardware-accelerated capacitive touch sensing?

Yes - it integrates a dedicated capacitive sensing controller supporting up to 16 channels with built-in charge transfer, measurement, and baseline tracking. No external components or firmware-based RC oscillation are required, and it operates concurrently with other peripherals in all low-power modes except Halt.

Can the 12-bit DAC output drive external loads directly?

The DAC features an internal output buffer capable of sourcing/sinking ±2 mA while maintaining monotonicity and linearity. It can directly drive low-impedance loads such as op-amp inputs or small piezo elements, but not high-current devices like LEDs or motors - those require external amplification or switching stages.

Is SWIM debug supported in all low-power modes?

SWIM debug remains accessible in Run, Wait, and Low power run modes. It is disabled in Low power wait, Active-halt, and Halt modes - consistent with ST's design to minimize leakage and ensure deterministic low-power behavior. Debug reactivation requires a reset or wake-up event followed by host reconnection.