STMicroelectronics STM32L471ZET6

Overview

STM32L471ZET6 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 dual 12-bit DACs, triple 12-bit ADCs, two op-amps, and two ultra-low-power comparators - deployed in battery-powered medical sensors and portable industrial data loggers.

For engineers reviewing the STM32L471ZET6 datasheet, STM32L471ZET6 pinout, STM32L471ZET6 application, or STM32L471ZET6 equivalent, key selection criteria include its 30 nA shutdown current, 420 nA standby-with-RTC mode, 1.1 µA/MHz run efficiency, and support for batch acquisition mode (BAM) in low-power audio sensing systems.

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 supports five low-power modes - Shutdown (30 nA), Standby (120 nA), Stop 2 (420 nA with RTC), and Run (100 µA/MHz) - with hardware-calibrated voltage scaling and brown-out reset (BOR).

Clock system includes three PLLs (system, audio, ADC), four oscillator sources (HSE 4–48 MHz, LSE 32.768 kHz, HSI16 ±1%, MSI auto-trimmed to ±0.25%), and dedicated clock trees for real-time audio (SAI), CAN 2.0B, and SDMMC interfaces - all synchronized via a programmable prescaler and gating logic.

Key Specifications

Pinout & Package

LQFP144 package with 0.5 mm pitch, 20 × 20 mm body, exposed thermal pad, and standard JEDEC MO-220 footprint - compatible with automated optical inspection and reflow soldering per IPC-J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L433RCT6, the STM32L471ZET6 adds QuadSPI, SDMMC, and dual SAI for richer connectivity - while STM32L552RET6 trades some analog integration for hardened security features and slightly higher active power, making it optimal for certified secure edge devices.

Availability

STM32L471ZET6 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 STM32L471ZET6 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, 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 - optimized for medical, metering, and portable industrial equipment.

FAQ

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

The STM32L471ZET6 operates at up to 80 MHz with 100 DMIPS performance. At this frequency, typical Run mode current is 100 µA/MHz (8 mA total) with ART Accelerator enabled and code executing from Flash - verified per DS10741 Rev 3 Table 27 under 3.3 V, 25 °C conditions.

Does STM32L471ZET6 support hardware encryption acceleration?

No, the STM32L471ZET6 does not include a dedicated cryptographic accelerator (e.g., AES, PKA, HASH). It relies on software libraries (STM32CubeL4) for encryption; for hardware-accelerated crypto, consider the STM32L552RET6 (AES-256, PKA, RNG) or STM32U5 series.

Can the internal op-amps drive standard audio line-level outputs directly?

No - the integrated op-amps are rail-to-rail with 10 MHz GBW and 50 mA short-circuit current, designed for sensor signal conditioning and DAC output buffering, not line-driving. For audio line-out, external Class AB amplifiers (e.g., TPA6130A2) are required to meet –10 dBV impedance and THD specifications.

What is the minimum supply voltage for RTC operation in VBAT mode?

In VBAT mode, the RTC and 32×32-bit backup registers operate down to 1.65 V - confirmed in DS10741 Rev 3 Section 6.3.6 and Table 20. Below 1.65 V, RTC functionality ceases and backup registers may lose data unless VDD is present.