STMicroelectronics STM32L471RET3TR

Overview

STM32L471RET3TR 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. It supports CAN 2.0B, dual SAI audio interfaces, and operates across -40 °C to 105 °C in LQFP64 package - deployed in battery-powered industrial sensors and portable medical monitors.

For engineers reviewing the STM32L471RET3TR datasheet, STM32L471RET3TR pinout, STM32L471RET3TR application, or STM32L471RET3TR equivalent, key selection criteria include its 420 nA Standby-with-RTC current, 1.1 µA/MHz run-mode efficiency, dual 12-bit DAC channels with sample-and-hold, and hardware parity-protected SRAM - critical for safety-aware embedded control and long-life IoT edge nodes.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from Flash at 80 MHz, alongside a memory protection unit (MPU) and interconnect matrix for deterministic peripheral arbitration. Its power architecture includes five low-power modes - Shutdown (30 nA), Standby (120 nA), Stop 2 (1.1 µA), and VBAT mode (300 nA) - all supported by brown-out reset and independent supply domains for analog peripherals.

Clock flexibility is provided by four oscillators: 4–48 MHz HSE, 32 kHz LSE for RTC, factory-trimmed 16 MHz HSI16 (±1%), and auto-calibrated MSI (100 kHz–48 MHz, ±0.25%). Three PLLs independently feed system, audio (SAI), and ADC clock trees, while the 14-channel DMA controller enables autonomous data movement between peripherals and memory without CPU intervention.

Key Specifications

Pinout & Package

LQFP64 package with 64-pin quad flat pack, 0.5 mm pitch, exposed thermal pad, RoHS-compliant and ECOPACK2® certified. Pin count and layout optimized for balanced signal routing and thermal dissipation in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L471RET3TR, the STM32L432KCU6 reduces peripheral count and package size for compact consumer wearables, while the STM32L552RET6P adds TrustZone and enhanced security features - making it appropriate for regulated environments where firmware integrity must be cryptographically enforced at silicon level.

Availability

STM32L471RET3TR is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart utility meters, and audio-enabled smart locks requiring stable component supply across multi-year production cycles.

Supply support for STM32L471RET3TR 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, MEMS, and automotive semiconductors since 1987.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, extended battery life, and rich analog integration - specifically engineered for IoT edge nodes, portable healthcare, and intelligent metering.

FAQ

What is the maximum operating frequency and associated performance metric?

The STM32L471RET3TR runs at up to 80 MHz with an Arm Cortex-M4 core featuring FPU and ART Accelerator™, delivering 100 DMIPS and 273.55 CoreMark® (3.42 CoreMark/MHz). This performance level supports real-time digital filtering, sensor fusion algorithms, and lightweight protocol stacks without compromising ultra-low-power operation.

Does this MCU support hardware cryptographic acceleration?

No, the STM32L471RET3TR does not include dedicated cryptographic accelerators (AES, PKA, HASH). It relies on software libraries for encryption; for hardware-accelerated crypto, consider the STM32L5 or STM32U5 series, which integrate AES-256, PKA, and TRNG with TrustZone®.

What are the supported low-power modes and their typical current draws?

Validated low-power modes include Shutdown (30 nA), Standby (120 nA), Standby with RTC (420 nA), Stop 2 (1.1 µA), and Stop 2 with RTC (1.4 µA). All values are measured at 25 °C with VDD = 3.3 V and peripherals disabled - confirmed per DS10741 Rev 3 Table 35–38.

Is the LQFP64 package of STM32L471RET3TR RoHS and REACH compliant?

Yes, the LQFP64 package is ECOPACK2® certified, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006 requirements. Full material declarations and compliance documentation are available via ST's official product page and Aetrix Electronics' quality portal.