STMicroelectronics STM32L471ZEJ6

Overview

STM32L471ZEJ6 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 (dual-bank read-while-write), 128 KB SRAM (32 KB with hardware parity), 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 industrial sensors and portable medical devices requiring long runtime and high-precision signal acquisition.

For engineers reviewing the STM32L471ZEJ6 datasheet, STM32L471ZEJ6 pinout, STM32L471ZEJ6 application, or STM32L471ZEJ6 equivalent, key selection criteria include its 420 nA Standby-with-RTC current, 4 µs wakeup from Stop mode, dual-bank Flash for seamless firmware updates, and LQFP144 package with 114 fast I/Os (most 5 V-tolerant) supporting independent supply down to 1.08 V.

Technical Context

This MCU implements FlexPowerControl architecture with seven low-power modes - Shutdown (30 nA), Standby (120 nA), Standby+RTC (420 nA), Stop 2 (1.1 µA), and Run (100 µA/MHz) - enabled by a multi-rail voltage regulator and adaptive real-time accelerator (ART Accelerator™) for zero-wait-state execution from Flash. Its interconnect matrix decouples bus masters to sustain concurrent peripheral operation without arbitration stalls.

The device integrates three PLLs (system, audio, ADC), dual SAIs for stereo audio streaming, CAN 2.0B interface, SDMMC, Quad SPI, and a 14-channel DMA controller with scatter-gather support. Analog subsystems operate on independent supplies, enabling simultaneous high-accuracy sensing and low-noise signal conditioning while maintaining sub-µA sleep retention.

Key Specifications

Pinout & Package

LQFP144 (20 × 20 mm, 0.5 mm pitch) package with 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 STM32L433RCT6, STM32L471ZEJ6 provides higher memory, richer analog/peripheral integration, and superior low-power metrics; versus STM32L552RET6, it trades hardware security for lower cost and broader analog capability - ideal where functional safety and deterministic latency outweigh formal security certification needs.

Availability

STM32L471ZEJ6 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart utility meters, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for STM32L471ZEJ6 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.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance per microwatt, with design focus on battery-operated IoT endpoints, portable healthcare, and energy-harvesting systems.

FAQ

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

The STM32L471ZEJ6 operates at up to 80 MHz with ART Accelerator™ enabled. At this frequency, typical Run mode current is 100 µA/MHz (8 mA total) with Flash execution, measured at 3.3 V and 25 °C. This value scales linearly with voltage and activity level, and drops to ~7.2 mA when using SRAM1 for code execution.

Does STM32L471ZEJ6 support hardware cryptographic acceleration?

No, STM32L471ZEJ6 does not include dedicated cryptographic accelerators (AES, PKA, HASH). It relies on software libraries for encryption; however, its true random number generator (RNG) and CRC unit support secure key derivation and integrity checking in resource-constrained implementations.

Which low-power mode retains RTC and backup registers while minimizing current draw?

Standby mode with RTC enabled draws 420 nA (typical) and retains RTC calendar, alarms, calibration, and all 32×32-bit backup registers. VBAT pin must be supplied (1.65–3.6 V) to maintain RTC functionality during main power loss.

Can the internal op-amps drive standard audio codecs or external transducers directly?

The two integrated op-amps support rail-to-rail output and programmable gain (PGA), but lack dedicated audio-line drive capability. They are optimized for sensor signal conditioning (e.g., bridge amplification, thermopile pre-amplification); driving headphones or line-level codecs requires external buffer stages due to limited output current (±20 mA typical) and bandwidth constraints.