STMicroelectronics STM32L041E6Y6TR

Overview

STM32L041E6Y6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN28 (4×4 mm) package, featuring 32 KB Flash with ECC, 8 KB SRAM, 1 KB EEPROM with ECC, 12-bit ADC (1.14 Msps, 10 channels), and hardware AES-128 encryption engine. It operates from 1.65 V to 3.6 V across –40 °C to +125 °C and targets battery-powered IoT sensor nodes requiring long runtime and secure firmware updates.

For engineers reviewing the STM32L041E6Y6TR datasheet, STM32L041E6Y6TR pinout, STM32L041E6Y6TR application, or STM32L041E6Y6TR equivalent, key selection criteria include standby current (0.23 µA), RTC-enabled stop mode (0.6 µA with 8 KB RAM retention), 5 µs wake-up from Flash, 31 5V-tolerant I/Os, and integrated AES for secure boot and OTA updates.

Technical Context

The STM32L041E6Y6TR implements a single-core Arm Cortex-M0+ running up to 32 MHz with 0.95 DMIPS/MHz performance, supported by dynamic voltage scaling and multiple clock sources: HSE (1–25 MHz), LSE (32 kHz), HSI16 (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz). Its low-power architecture includes seven power modes - Run, Sleep, Low-power Run, Low-power Sleep, Stop, Standby, and Shutdown - each with distinct peripheral availability and current consumption profiles.

Peripheral interconnect is managed via an AHB/APB matrix supporting concurrent DMA transfers across ADC, SPI, I²C, USART, timers, and AES. The device integrates two ultra-low-power comparators (operable down to 1.65 V), a temperature sensor, CRC unit, 96-bit unique ID, and serial wire debug (SW-DP) for development.

Key Specifications

Pinout & Package

STM32L041E6Y6TR is housed in a 28-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN28) package measuring 4×4 mm with 0.5 mm pitch and exposed thermal pad. This RoHS-compliant ECOPACK®2 package supports reflow soldering and offers excellent thermal performance for continuous low-power operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L041E6Y6TR, STM32L051K8U6 adds USB and memory at the expense of size and power efficiency, while STM32L011F4P6 sacrifices AES, EEPROM, and ADC resolution to reduce cost - making STM32L041E6Y6TR the optimal balance of security, retention, and ultra-low-power performance in compact form factor.

Availability

STM32L041E6Y6TR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, medical wearable patches, and asset tracking tags requiring stable component supply across multi-year production cycles.

Supply support for STM32L041E6Y6TR 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 automotive semiconductors since 1987.

The STM32L0 series targets ultra-low-power embedded applications demanding extended battery life, robust security, and industrial-grade reliability - optimized for IoT endpoints, portable medical devices, and smart infrastructure.

FAQ

What is the maximum operating frequency and core type of STM32L041E6Y6TR?

The STM32L041E6Y6TR uses an Arm Cortex-M0+ core with a maximum CPU frequency of 32 MHz. It achieves 0.95 DMIPS/MHz and supports dynamic voltage scaling to optimize performance versus power consumption. The core operates across the full 1.65–3.6 V supply range and is qualified for –40 °C to +125 °C ambient temperatures.

Does STM32L041E6Y6TR support hardware encryption, and what algorithms are implemented?

Yes, STM32L041E6Y6TR integrates a dedicated hardware AES-128 encryption engine compliant with FIPS-197. It supports ECB, CBC, CTR, and GCM modes with DMA acceleration, enabling secure firmware updates, encrypted sensor payloads, and TLS offload without CPU intervention. No software library dependency is required for basic AES operations.

How many I/O pins are 5V tolerant, and which packages are offered for this part?

STM32L041E6Y6TR provides 31 I/O pins with 5V tolerance on its full pinout; however, in the UFQFPN28 package (which this part uses), only 21 pins are accessible and 5V tolerant. The device is available in UFQFPN28 (4×4 mm), UFQFPN32 (5×5 mm), UFQFPN48 (7×7 mm), LQFP32/48, WLCSP25, and TSSOP20 - with STM32L041E6Y6TR specifically designated for UFQFPN28.

What low-power modes does STM32L041E6Y6TR support, and what is the lowest achievable current draw?

STM32L041E6Y6TR supports six low-power modes: Sleep, Low-power Sleep, Stop, Standby, Shutdown, and Low-power Run. The lowest current draw is 0.23 µA in Standby mode with two wakeup pins enabled. With RTC active and 8 KB SRAM retention, Stop mode consumes 0.6 µA - verified per DS10780 Rev 6 electrical characteristics tables under VDD = 3.0 V and TA = 25 °C.