STMicroelectronics STM32L476RET6TR

Overview

STM32L476RET6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, delivering 100 DMIPS at 80 MHz, featuring 512 KB flash, 128 KB SRAM, USB OTG FS, LCD controller, and integrated SMPS support. It operates from 1.71–3.6 V across –40 °C to 105 °C, with 39 µA/MHz active power in SMPS mode, and targets battery-powered IoT sensors, portable medical devices, and smart metering endpoints.

For engineers reviewing the STM32L476RET6TR datasheet, STM32L476RET6TR pinout, STM32L476RET6TR application, or STM32L476RET6TR equivalent, key selection criteria include its dual-voltage I/O (up to 5 V-tolerant), hardware parity-protected SRAM, batch acquisition mode (BAM) for sensor data bursts, and RTC with hardware calendar-critical for time-stamped edge-node firmware.

Technical Context

This MCU integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from flash, and three independent PLLs for system, USB, and audio clock domains. Its interconnect matrix decouples bus arbitration between CPU, DMA, and peripherals, reducing latency for concurrent ADC sampling and USB transfers.

The device supports FlexPowerControl with seven low-power modes-including Stop 2 (1.1 µA) and Shutdown (30 nA)-and features a dedicated low-power timer (LPTIM) that remains active in Stop mode for precise wake-up scheduling without CPU intervention.

Key Specifications

Pinout & Package

LQFP144 (20 × 20 mm, 0.5 mm pitch) package with 114 fast I/Os-most 5 V-tolerant-and independent supply capability for up to 14 I/Os down to 1.08 V.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L432KCU6, the STM32L476RET6TR provides 16× more flash and integrated LCD/DFSDM for richer HMI and precision sensing; versus STM32L552RET6, it trades security extensions for lower active current and mature toolchain support in legacy industrial deployments.

Availability

STM32L476RET6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic devices requiring stable component supply across multi-year production cycles.

Supply support for STM32L476RET6TR 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 ICs, sensors, and automotive semiconductors since 1987.

The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, rich analog integration, and robust real-time performance-optimized for IoT edge nodes and portable medical equipment.

FAQ

What is the maximum operating frequency and associated performance metric?

The STM32L476RET6TR runs at up to 80 MHz with its Arm Cortex-M4 core, achieving 100 DMIPS and 273.55 CoreMark® (3.42 CoreMark/MHz). This performance is sustained with zero wait states via the ART Accelerator™, enabling deterministic real-time response for motor control and sensor fusion algorithms without flash latency penalties.

Does this MCU support external memory expansion, and if so, what types?

Yes, it supports external memory via two interfaces: the Flexible Static Memory Controller (FSMC) for SRAM, PSRAM, NOR, and NAND memories, and the Quad SPI (QUADSPI) interface for high-speed serial flash. These allow off-chip code execution, data logging buffers, or graphical asset storage-critical for displays or firmware-over-the-air updates.

How does the power management architecture reduce system-level energy consumption?

It implements seven low-power modes-from 30 nA Shutdown to 1.1 µA Stop 2-with configurable wakeup sources including LPTIM, RTC alarms, and 5 dedicated pins. The SMPS interface enables ~2.5× lower active current versus LDO operation, and Batch Acquisition Mode (BAM) lets peripherals operate autonomously while the CPU sleeps, minimizing total system energy per measurement cycle.

What development tools and debug interfaces are supported?

It supports Serial Wire Debug (SWD), JTAG, and Embedded Trace Macrocell™ (ETM) for real-time instruction tracing. ST's STM32CubeMX, HAL/LL libraries, and Keil MDK-ARM/IAR EWARM toolchains provide full support. Evaluation is enabled via the NUCLEO-L476RG board, which shares the same LQFP64 footprint variant and peripheral configuration.