STMicroelectronics STM32L471ZET6TR

Overview

STM32L471ZET6TR 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 IoT edge nodes requiring secure, real-time sensor fusion and audio preprocessing.

For engineers reviewing the STM32L471ZET6TR datasheet, STM32L471ZET6TR pinout, STM32L471ZET6TR application, or STM32L471ZET6TR equivalent, key selection criteria include its 420 nA Standby-with-RTC current, 4 µs wakeup from Stop mode, LQFP144 package with 114 fast I/Os (most 5 V-tolerant), and dual-bank Flash enabling robust firmware updates in field-deployed devices.

Technical Context

This MCU implements FlexPowerControl architecture with seven low-power modes (Shutdown, Standby, Stop 0/1/2, Sleep, Low-power Sleep), where Stop 2 mode draws just 420 nA while retaining RTC and 32×32-bit backup registers. Its ART Accelerator™ enables zero-wait-state execution from Flash at 80 MHz, eliminating cache misses in deterministic real-time loops.

The device integrates three independent power domains (VDD, VDDA, VREF+), supporting simultaneous operation of high-speed digital logic (up to 80 MHz), precision analog acquisition (ADC/DAC/OPAMP/COMP), and ultra-low-power peripherals (LPUART, LPTIM, RTC) - all with hardware-enforced isolation and voltage scaling control.

Key Specifications

Pinout & Package

LQFP144 (20 × 20 mm, 0.5 mm pitch) package with exposed thermal pad; 114 user I/Os, 5 dedicated VSS/VDD pairs, separate analog/digital supplies (VDDA/VSSA, VREF+/VREF−), and dedicated reset, boot, and debug pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L471ZET6TR, STM32L476RG offers display capability at the cost of higher BOM complexity, while STM32L552ZE trades analog/audio richness for hardware-enforced security - making the ZET6TR optimal for cost-sensitive, analog-intensive, battery-operated edge nodes needing balanced performance and peripheral coverage.

Availability

STM32L471ZET6TR is available at Aetrix Electronics and suitable for smart utility meters, portable medical sensors, industrial predictive maintenance nodes, and audio-enabled smart home gateways requiring stable component supply across multi-year production cycles.

Supply support for STM32L471ZET6TR 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 analog components for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance per microamp, combining energy efficiency with rich analog and communication peripherals for intelligent edge devices.

FAQ

What is the maximum operating frequency and corresponding power supply range?

The STM32L471ZET6TR operates up to 80 MHz across its full supply range of 1.71 V to 3.6 V. At 80 MHz, it delivers 100 DMIPS with the ART Accelerator™ enabled. Voltage scaling (Range 1/2/3) dynamically adjusts regulator output to match performance needs, reducing active current by up to 30% in Range 2 versus Range 1 at the same clock speed.

Does this MCU support true hardware cryptographic acceleration?

No, the STM32L471ZET6TR does not include dedicated cryptographic accelerators (e.g., AES, PKA, HASH). It relies on software libraries for encryption, though its TRNG and 96-bit unique ID provide foundational entropy and device identity for secure key derivation and attestation in conjunction with external secure elements.

How many ADC channels can be simultaneously sampled with hardware synchronization?

All three 12-bit ADCs (ADC1, ADC2, ADC3) support simultaneous sampling via hardware trigger synchronization using TIM1/TRGO or external event. This enables precise phase-aligned acquisition across multiple sensors - for example, capturing voltage, current, and temperature in motor control systems with <100 ns inter-channel skew.

What debug interfaces are supported and what pins do they require?

The STM32L471ZET6TR supports Serial Wire Debug (SWD) using PA13 (SWDIO) and PA14 (SWCLK), requiring only two pins and no dedicated reset line for basic programming. JTAG is also available but uses five pins (TMS, TCK, TDI, TDO, NRST); SWD is preferred for space-constrained designs due to its minimal footprint and full debug capability.