STMicroelectronics STM32L476JEY6TR

Overview

STM32L476JEY6TR 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, USB OTG FS, LCD controller, and integrated SMPS support. It delivers 39 µA/MHz in SMPS-run mode, 420 nA Standby with RTC, and supports capacitive touch sensing for battery-powered industrial sensors and portable medical devices.

For engineers reviewing the STM32L476JEY6TR datasheet, STM32L476JEY6TR pinout, STM32L476JEY6TR application, or STM32L476JEY6TR equivalent, key selection criteria include its dual-voltage I/O (1.08–3.6 V), hardware parity-protected SRAM, ART Accelerator™ for zero-wait-state flash execution, and low-power timer availability in Stop 2 mode.

Technical Context

The device integrates an Adaptive Real-Time Accelerator (ART™) enabling deterministic 0-wait-state execution from flash at 80 MHz, coupled with a memory protection unit (MPU) and interconnect matrix for concurrent peripheral access. Its power architecture includes three voltage scaling modes (VOS0–VOS2), external SMPS interface (VDD12), and FlexPowerControl supporting 30 nA Shutdown and 1.4 µA Stop 2 with RTC.

Clock system comprises four independent sources: 4–48 MHz HSE, 32 kHz LSE for RTC, factory-trimmed 16 MHz HSI, and auto-calibrated MSI (100 kHz–48 MHz ±0.25%). Three PLLs generate system, USB, and audio clocks, while the RTC includes hardware calendar, alarm, and calibration registers.

Key Specifications

Pinout & Package

STM32L476JEY6TR is housed in a 72-pin WLCSP (Wafer-Level Chip Scale Package) with 0.4 mm pitch, measuring 4.26 × 4.06 mm. The package supports solder reflow per JEDEC J-STD-020 and features exposed thermal pad for enhanced thermal dissipation in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L432KCU6, STM32L476JEY6TR provides 16× more flash and integrated LCD/SMPS for self-contained HMI systems; versus STM32L552RET6, it trades TrustZone security for 2.8× lower active power - making it superior for longevity-critical edge sensors.

Availability

STM32L476JEY6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic devices requiring stable component supply across multi-year production cycles.

Supply support for STM32L476JEY6TR 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 automotive semiconductors since 1987.

The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, rich analog integration, and robust real-time performance - especially in portable medical, metering, and IoT edge devices.

FAQ

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

The STM32L476JEY6TR operates up to 80 MHz with 100 DMIPS performance. In SMPS-run mode at 3.3 V supply and 80 MHz, typical current consumption is 3.12 mA (39 µA/MHz × 80 MHz), verified per DS10198 Table 28. This assumes ART Accelerator enabled, Cache ON, Prefetch OFF, and code execution from flash.

Does STM32L476JEY6TR 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 are accessible via dedicated address/data bus pins in LQFP/UFBGA packages; WLCSP72 does not expose FSMC signals due to pin count constraints.

How many independent power domains does the device support for I/O voltage scaling?

It supports three independent power domains: VDD (core/SRAM), VDDA (analog), and VDDIO2 (I/O bank 2). Up to 14 I/Os can be supplied by VDDIO2 down to 1.08 V, enabling direct interfacing with low-voltage peripherals like 1.2 V logic or segmented LCD glass without level shifters.

What RTC features are implemented in hardware beyond basic timekeeping?

The RTC includes hardware calendar (YY-MM-DD w/days elapsed), programmable alarms (A/B), periodic wakeup (1 Hz to 1 month), calibration register (±487 ppm adjustment), and VBAT backup domain with 32×32-bit tamper-protected registers. All operate in Standby/Shutdown modes with 420 nA or 30 nA current draw respectively.