STMicroelectronics STM32L471QGI6

Overview

STM32L471QGI6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 1 MB Flash, 128 KB SRAM, and integrated analog peripherals including three 12-bit ADCs (5 Msps), two 12-bit DACs, two op-amps, and two ultra-low-power comparators. It supports capacitive touch sensing (24 channels), dual SAIs for audio, CAN 2.0B, and LPUART wake-up from Stop 2 mode - deployed in battery-powered industrial sensors and portable medical monitors.

For engineers reviewing the STM32L471QGI6 datasheet, STM32L471QGI6 pinout, STM32L471QGI6 application, or STM32L471QGI6 equivalent, key selection criteria include its 30 nA shutdown current, ART Accelerator™ enabling zero-wait-state Flash execution, dual-bank read-while-write Flash architecture, and UFBGA144 package with 114 fast I/Os (most 5 V-tolerant) supporting independent supply down to 1.08 V.

Technical Context

The STM32L471QGI6 implements an Arm Cortex-M4 core with FPU and Adaptive Real-time Accelerator (ART™) for deterministic Flash execution at 80 MHz. Its FlexPowerControl architecture enables seven low-power modes - including 30 nA Shutdown and 420 nA Standby with RTC - managed by a dedicated power control block with BOR and voltage scaling.

Analog integration includes three independent 12-bit ADCs (5 Msps, hardware oversampling up to 16-bit), two rail-to-rail DACs with sample-and-hold, two programmable-gain op-amps, and two comparators - all supported by separate analog supply domains (VDDA/VSSA) and internal voltage reference (VREFINT) with calibration.

Key Specifications

Pinout & Package

STM32L471QGI6 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. The package supports thermal dissipation via exposed thermal pad and complies with ECOPACK2® environmental standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L433RCT6, the STM32L471QGI6 delivers double Flash/SRAM, audio and CAN connectivity, and superior low-power metrics (30 nA vs. 120 nA shutdown); versus STM32L562QEJ6, it trades security extensions and higher clock speed for lower cost and proven maturity in volume production.

Availability

STM32L471QGI6 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical devices, smart utility meters, and audio-enabled IoT gateways requiring stable component supply across multi-year production cycles.

Supply support for STM32L471QGI6 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 products for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-microwatt, with emphasis on battery longevity, rich analog integration, and secure firmware execution - optimized for wearables, medical devices, and smart infrastructure.

FAQ

What is the maximum operating temperature range for STM32L471QGI6?

The STM32L471QGI6 is qualified for industrial operation from –40 °C to +105 °C ambient temperature. This rating is confirmed in Section 6.3.1 of DS10741 Rev 3 and applies to all UFBGA144 variants. The device also supports extended operation up to +125 °C in specific configurations, but only the 105 °C grade is guaranteed for full peripheral functionality and timing compliance.

Does STM32L471QGI6 support true random number generation?

Yes, STM32L471QGI6 integrates a certified True Random Number Generator (TRNG) compliant with NIST SP800-90B and AIS-31 standards. It delivers entropy at up to 10 Mbit/s and is accessible via the RCC and RNG peripherals. The TRNG is factory-tested and documented in Section 3.22 of the datasheet, with driver support in STM32CubeL4 HAL libraries.

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

No - the internal 32 kHz RC oscillator (LSI) has ±5% accuracy and is unsuitable for RTC calendar functions requiring long-term stability. Only the external 32.768 kHz crystal (LSE) connected to PC14/PC15 provides the ±20 ppm accuracy needed for reliable timekeeping. LSI may be used for basic wake-up timing in Stop mode but not for HW calendar or alarm features.

How many I/O pins support independent VDDIO2 supply down to 1.08 V?

Exactly 14 I/O pins - PA0–PA7, PB0–PB1, PC6–PC7, and PD2 - are assigned to I/O bank 2 and support independent VDDIO2 supply ranging from 1.08 V to 3.6 V. This capability enables direct interfacing with low-voltage peripherals (e.g., 1.2 V logic, certain MEMS sensors) without level shifters, as specified in Section 3.12 and Table 16 of DS10741 Rev 3.