STMicroelectronics STM32L476QEI6TR

Overview

STM32L476QEI6TR 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, 128 KB SRAM, USB OTG FS, LCD controller (8×40), and integrated SMPS support. It operates from 1.71–3.6 V across –40 °C to 105 °C and targets battery-powered IoT edge nodes requiring long runtime and rich peripheral integration.

For engineers reviewing the STM32L476QEI6TR datasheet, STM32L476QEI6TR pinout, STM32L476QEI6TR application, or STM32L476QEI6TR equivalent, key selection criteria include its 39 µA/MHz SMPS-enabled run mode, dual 12-bit DACs with sample-and-hold, 3× 12-bit ADCs (5 Msps), 24-channel capacitive touch sensing, and LQFP144 package compatibility with industrial HMI and portable medical devices.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash, a 32-bit interconnect matrix for concurrent peripheral access, and FlexPowerControl architecture supporting seven low-power modes - including 30 nA Shutdown and 420 nA Standby with RTC. Its clock system includes three PLLs (system/USB/audio), auto-trimmed multispeed oscillator (±0.25%), and dual crystal support (4–48 MHz + 32 kHz).

Analog subsystem comprises two rail-to-rail op-amps with programmable gain, two ultra-low-power comparators, true random number generator, and four digital filters for sigma-delta modulators. Communication stack includes CAN 2.0B, SDMMC, SWPMI, IRTIM, 5× USARTs (one LPUART with Stop 2 wake-up), and dual SAIs for audio streaming.

Key Specifications

Pinout & Package

LQFP144 package: 20 × 20 mm body, 0.5 mm pitch, 144 leads, 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 STM32L432KCU6, the STM32L476QEI6TR adds LCD, CAN, dual DACs, and SMPS support-enabling richer HMI and industrial connectivity; versus STM32L562QEI6, it trades TrustZone security for lower cost and mature toolchain support while retaining identical power performance and peripheral breadth.

Availability

STM32L476QEI6TR is available at Aetrix Electronics and suitable for smart utility metering, portable medical devices, industrial HMI panels, and asset tracking beacons requiring stable component supply and long-term manufacturability.

Supply support for STM32L476QEI6TR 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, specializing in microcontrollers, power management, sensors, and automotive ICs with strong R&D investment in ultra-low-power design.

The STM32L4 series targets battery-constrained applications demanding high integration, robust analog capability, and industry-leading energy efficiency-designed specifically for IoT endpoints, wearables, and industrial edge sensors.

FAQ

What is the maximum operating temperature range for STM32L476QEI6TR?

The STM32L476QEI6TR is rated for operation from –40 °C to +105 °C ambient temperature, validated per ST's industrial qualification standards. This extended range supports deployment in harsh environments such as outdoor utility infrastructure and factory-floor HMIs where thermal cycling and elevated ambient temperatures occur.

Does STM32L476QEI6TR support external memory interfaces?

Yes-it integrates a Flexible Static Memory Controller (FSMC) supporting SRAM, PSRAM, NOR, and NAND memories, plus a Quad-SPI interface for high-speed serial flash. These allow expansion of code/data space beyond on-chip limits, enabling complex GUIs or firmware-over-the-air (FOTA) staging in resource-constrained designs.

How does the Batch Acquisition Mode (BAM) reduce system power consumption?

BAM allows selected peripherals-including ADCs, timers, and DFSDM-to operate autonomously while the CPU remains in Stop mode. This eliminates repeated wake-up cycles for periodic sampling, cutting dynamic power overhead and enabling sub-microamp average current in sensor logging applications with fixed acquisition intervals.

Can STM32L476QEI6TR drive a segment LCD without external components?

Yes-the integrated LCD controller supports 8×40 or 4×44 segment configurations and includes an internal step-up converter, eliminating the need for external voltage boosters. It directly drives common-anode or common-cathode LCDs with software-configurable bias and frame frequency, simplifying BOM and layout for metering and industrial displays.