STMicroelectronics STM32L471RET6TR

Overview

STM32L471RET6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 512 KB Flash, 128 KB SRAM, and integrated analog peripherals including three 12-bit ADCs (5 Msps), two 12-bit DACs, two op-amps, and two ultra-low-power comparators - deployed in battery-powered IoT sensor nodes requiring long runtime and precision signal acquisition.

For engineers reviewing the STM32L471RET6TR datasheet, STM32L471RET6TR pinout, STM32L471RET6TR application, or STM32L471RET6TR equivalent, key selection criteria include verified low-power mode current (420 nA Standby with RTC), LQFP64 package compatibility, dual-bank Flash for robust firmware updates, and hardware-accelerated cryptographic support via AES-128/256 and TRNG.

Technical Context

This MCU implements the Arm Cortex-M4 core with FPU and Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from Flash at 80 MHz. It integrates a flexible power architecture with seven low-power modes (Shutdown, Standby, Stop 0–2, Sleep, Low-power Sleep), each with defined wakeup sources and latency (e.g., 4 µs from Stop mode).

The peripheral interconnect matrix enables concurrent high-bandwidth data movement across 19 communication interfaces - including CAN 2.0B, dual SAI for audio streaming, LPUART with Stop 2 wake-up capability, and Quad SPI for external memory expansion - all supported by a 14-channel DMA controller with scatter-gather capability.

Key Specifications

Pinout & Package

LQFP64 package: 64-pin quad flat pack, 10 × 10 mm body, 0.5 mm lead pitch, exposed thermal pad, RoHS-compliant and ECOPACK2® certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L432KCU6, the STM32L471RET6TR adds CAN, SAI, and richer analog resources for complex edge processing; versus STM32L552RET6P, it trades TrustZone and lower Stop current for broader peripheral availability and mature toolchain support.

Availability

STM32L471RET6TR is available at Aetrix Electronics and suitable for smart utility meters, wearable health monitors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply across multi-year production cycles.

Supply support for STM32L471RET6TR 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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, rich analog integration, and real-time performance - optimized for IoT edge devices, portable medical instruments, and energy-harvesting systems.

FAQ

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

The STM32L471RET6TR operates at up to 80 MHz with 100 DMIPS performance. At 80 MHz with ART Accelerator enabled and code executing from Flash, typical current consumption is 100 µA/MHz - resulting in ~8 mA total at full speed. This value assumes VDD = 3.3 V, 25 °C ambient, and default voltage scaling (Range 1).

Does this MCU support hardware encryption and secure boot?

Yes. The STM32L471RET6TR integrates a dedicated AES-128/256 accelerator, true random number generator (TRNG), and CRC calculation unit. Combined with readout protection (ROP) levels and secure bootloader in system memory, it supports secure firmware authentication and encrypted OTA updates - though it lacks TrustZone hardware isolation found in the L5 series.

What are the key differences between Stop 0, Stop 1, and Stop 2 low-power modes?

Stop 0 disables CPU, clocks, and most peripherals but retains SRAM and register content; Stop 1 powers down the voltage regulator for deeper savings; Stop 2 further disables the low-power regulator and retains only RTC, backup registers, and select wakeup logic. Stop 2 draws 1.1 µA (with RTC) and wakes in 4 µs - the lowest-power active-retention mode.

Can the LQFP64 package support all 114 I/Os listed in the datasheet?

No. The LQFP64 package physically limits I/O count to 51 usable pins (excluding power, reset, debug, and clock). Full 114 I/O support requires larger packages like LQFP144 or UFBGA144. Pin mapping is package-dependent - consult Table 16 in DS10741 Rev 3 for LQFP64-specific pin definitions and alternate functions.