STMicroelectronics STM32L471ZEJ6TR

Overview

STM32L471ZEJ6TR 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 supports advanced low-power modes such as 420 nA Standby with RTC and 1.1 µA Stop 2 mode, and is deployed in battery-powered industrial sensors and portable medical monitors requiring long runtime and mixed-signal precision.

For engineers reviewing the STM32L471ZEJ6TR datasheet, STM32L471ZEJ6TR pinout, STM32L471ZEJ6TR application, or STM32L471ZEJ6TR equivalent, key selection criteria include verified ultra-low-power operation down to 420 nA (Standby + RTC), dual 12-bit DAC channels with sample-and-hold, hardware-accelerated capacitive touch sensing (24 channels), and CAN 2.0B interface support for embedded control networks.

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 three independent voltage regulators supporting dynamic voltage scaling across Run, Stop, and Standby modes.

It features dual clock domains: one for system/peripheral operation (up to 80 MHz via PLL) and another for real-time functions (RTC, LPUART, LPTIM), with five clock sources - HSE (4–48 MHz), LSE (32.768 kHz), HSI16 (±1%), MSI (auto-trimmed to ±0.25%), and LSI - enabling precise timing control and robust wake-up capability from deep sleep.

Key Specifications

Pinout & Package

STM32L471ZEJ6TR is housed in a 144-pin Ultra-Fine-Pitch Ball Grid Array (UFBGA144) package with 0.8 mm ball pitch and 10 mm × 10 mm body size, optimized for space-constrained portable and industrial applications. The package supports 114 fast I/Os (most 5 V-tolerant) and independent I/O supply down to 1.08 V on up to 14 pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L471ZEJ6TR, STM32L433RCT6 sacrifices Flash, analog resources, and connectivity for lower cost and footprint, while STM32L552RET6 adds TrustZone and CAN FD at higher power and price-making the L471 the optimal balance of ultra-low-power analog integration, CAN 2.0B, and proven industrial reliability.

Availability

STM32L471ZEJ6TR is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical devices, smart building controllers, and asset tracking beacons requiring stable component supply across multi-year production cycles.

Supply support for STM32L471ZEJ6TR 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 analog components for industrial, automotive, and consumer markets.

This device belongs to the STM32L4 ultra-low-power MCU product line, engineered specifically for energy-sensitive applications demanding rich analog integration, real-time performance, and extended battery life without compromising feature density.

FAQ

What is the maximum operating temperature range for STM32L471ZEJ6TR?

The STM32L471ZEJ6TR is qualified for operation from –40 °C to +105 °C ambient temperature, as specified in DS10741 Rev 3 Section 6.3.1. This extended industrial temperature grade supports deployment in harsh environments such as factory automation enclosures and outdoor metering systems without thermal derating.

Does STM32L471ZEJ6TR support hardware encryption acceleration?

No, STM32L471ZEJ6TR does not include dedicated cryptographic accelerators (AES, PKA, HASH). It provides a true random number generator (RNG) and CRC calculation unit, but symmetric/asymmetric encryption must be implemented in software-unlike the STM32L5 series which integrates AES-256 and PKA.

Can the internal 32 kHz RC oscillator replace the LSE crystal for RTC operation?

Yes, the internal low-power 32 kHz RC oscillator (±5% accuracy) can drive the RTC in applications where timekeeping precision is secondary to power savings. However, for calendar-grade accuracy (±5 ppm), the external 32.768 kHz crystal (LSE) on PC14/PC15 is required per Section 3.11 and Table 48 of the datasheet.

How many independent power domains does STM32L471ZEJ6TR support?

The device supports three independent power domains: VDD/VSS (digital core), VDDA/VSSA (analog), and VDDIO2 (I/O bank 2). This allows separate voltage scaling and sequencing-critical for noise isolation in mixed-signal designs and enabling 1.08 V I/O operation while maintaining 3.3 V analog supply.