STMicroelectronics STM32L471QEI7TR

Overview

STM32L471QEI7TR 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 with PGA, and two ultra-low-power comparators. It targets battery-powered IoT sensor nodes, portable medical devices, and energy-harvesting systems requiring sub-µA standby operation and robust mixed-signal capability.

For engineers reviewing the STM32L471QEI7TR datasheet, STM32L471QEI7TR pinout, STM32L471QEI7TR application, or STM32L471QEI7TR equivalent, key selection criteria include its 30 nA shutdown current, dual-bank read-while-write Flash, hardware parity on 32 KB SRAM, 114 fast I/Os (most 5 V-tolerant), and support for batch acquisition mode (BAM) in low-power audio sensing.

Technical Context

This MCU 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 Run (100 µA/MHz)-with brown-out reset and voltage scaling control.

The analog subsystem features independent supply domains, supporting simultaneous high-speed sampling (ADC @ 5 Msps) and low-noise signal conditioning (op-amp + PGA), while digital interfaces include CAN 2.0B, dual SAI for stereo audio, LPUART for Stop 2 wake-up, and Quad SPI for external memory expansion.

Key Specifications

Pinout & Package

STM32L471QEI7TR is housed in a 132-ball Ultra-Fine-Pitch Ball Grid Array (UFBGA132) package with 0.5 mm ball pitch and 7 mm × 7 mm body size, optimized for high-density PCB layouts and thermal performance in fanless applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L433RCT6, the STM32L471QEI7TR adds Quad SPI and DFSDM for high-resolution sensor processing; versus STM32L552RET6, it trades TrustZone security for lower power and cost-making it optimal for non-certified but highly constrained edge nodes.

Availability

STM32L471QEI7TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable audio recorders requiring stable component supply across multi-year production cycles.

Supply support for STM32L471QEI7TR 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 automotive semiconductors since 1987.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, with design focus on battery longevity, integrated analog functionality, and secure firmware update capability in resource-constrained environments.

FAQ

What is the maximum operating frequency and core type of STM32L471QEI7TR?

The STM32L471QEI7TR features an Arm Cortex-M4 core with FPU, rated for up to 80 MHz operation delivering 100 DMIPS. Its Adaptive Real-time Accelerator (ART Accelerator™) ensures zero-wait-state execution from Flash memory, maintaining deterministic timing for real-time control tasks without external cache.

Does STM32L471QEI7TR support hardware encryption or secure boot features?

STM32L471QEI7TR includes a true random number generator (RNG), CRC calculation unit, and 96-bit unique ID-enabling basic cryptographic operations like secure key generation and firmware signature verification. However, it lacks TrustZone or dedicated cryptographic accelerators; for certified secure boot, ST recommends the STM32L5 series instead.

What low-power modes are available and what are their typical current draws?

It offers five low-power modes: Shutdown (30 nA), Standby (120 nA), Standby with RTC (420 nA), Stop 2 (1.1 µA), and Stop 1 (1.4 µA with RTC). All modes retain SRAM content and support wakeup via GPIO, RTC alarm, or LPUART-enabling flexible trade-offs between latency and energy savings in intermittent-sensing applications.

Which package variant does STM32L471QEI7TR use and what are its key mechanical attributes?

STM32L471QEI7TR uses the UFBGA132 package: 132-ball grid, 7 mm × 7 mm body, 0.5 mm ball pitch, and 0.35 mm ball diameter. It complies with ECOPACK2® environmental standards and supports reflow soldering per JEDEC J-STD-020, with thermal resistance (θ_JA) of 32 °C/W in standard 4-layer PCB layout.