STMicroelectronics STM32L051T8Y6TR

Overview

STM32L051T8Y6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in a 32-pin UFQFPN (5×5 mm) package, featuring 64 KB Flash, 8 KB SRAM, 2 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and dual ultra-low-power comparators. It operates from 1.65–3.6 V across –40 to +125 °C and targets battery-powered IoT sensors and portable medical devices requiring sub-µA standby current (0.27 µA).

For engineers reviewing the STM32L051T8Y6TR datasheet, STM32L051T8Y6TR pinout, STM32L051T8Y6TR application, or STM32L051T8Y6TR equivalent, key selection criteria include verified low-power mode timing (3.5 µs wakeup from RAM), 45 I/Os with 5V tolerance, integrated RTC + 8-KB RAM retention in Stop mode, and pre-programmed USART/SPI bootloader support.

Technical Context

The STM32L051T8Y6TR implements a Cortex-M0+ core with MPU, running at up to 32 MHz (0.95 DMIPS/MHz), supported by multiple clock sources: 1–25 MHz HSE, 32 kHz LSE for RTC, 16 MHz factory-trimmed HSI (±1%), and multispeed MSI (65 kHz–4.2 MHz). Its interconnect matrix routes peripherals-including 2x USART, 4x SPI, 2x I2C, 7-channel DMA, and 9 timers-to memory and I/O without CPU intervention.

Ultra-low-power operation is enforced via five distinct low-power modes: Standby (0.27 µA), Stop (0.4 µA), Stop+RTC+RAM retention (0.8 µA), Low-power Run, and Sleep. Power management includes programmable voltage detector (PVD), ultra-safe BOR with 5 thresholds, and dynamic voltage scaling-enabling precise trade-offs between performance and energy consumption in constrained environments.

Key Specifications

Pinout & Package

STM32L051T8Y6TR uses a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN32) package measuring 5×5 mm with 0.5 mm pitch, optimized for space-constrained PCB layouts and automated assembly. The package 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 STM32L051T8Y6TR, STM32L071K8U6 offers USB and crypto extensions at the cost of larger footprint and higher BOM, while EFM32PG12B500F1024GL125 trades EEPROM and compact size for raw processing headroom-making the STM32L051T8Y6TR optimal for cost-sensitive, space-constrained, EEPROM-dependent sensing nodes.

Availability

STM32L051T8Y6TR is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for STM32L051T8Y6TR 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, MEMS, and automotive semiconductors since 1987.

The STM32L0 series targets ultra-low-power embedded applications-specifically battery-operated IoT endpoints, wearables, and energy-harvesting systems-where sub-µA standby, integrated EEPROM, and robust analog peripherals reduce system-level complexity.

FAQ

What is the maximum operating frequency and core type of the STM32L051T8Y6TR?

The STM32L051T8Y6TR features an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS per MHz. It achieves this frequency using internal HSI16 (±1% factory trim), PLL multiplication of HSE or MSI, or direct HSE input-enabling deterministic real-time execution while maintaining ultra-low-power efficiency in both Run and Sleep modes.

Does the STM32L051T8Y6TR support hardware encryption or secure boot?

No, the STM32L051T8Y6TR does not include dedicated hardware cryptographic accelerators (e.g., AES, SHA, PKA) or secure boot ROM. It relies on software-based encryption libraries and standard flash write protection mechanisms. For secure firmware update or data confidentiality, designers must implement external secure elements or select higher-tier L0/L4 variants like STM32L071 or STM32L4 series.

How many I/O pins are 5V tolerant, and what is the absolute maximum rating for VDD?

40 of the 45 general-purpose I/Os on the STM32L051T8Y6TR are 5V tolerant, allowing direct interfacing with 5V logic without level shifters. The absolute maximum VDD rating is 4.0 V per STMicroelectronics' DS10184 Rev 10, though recommended operating range remains 1.65–3.6 V for guaranteed functionality and low-power behavior.

Can the STM32L051T8Y6TR retain RAM contents during deep sleep, and how much RAM is preserved?

Yes-the STM32L051T8Y6TR retains full 8 KB SRAM contents in Stop mode when configured with RTC enabled and appropriate power control register settings. This mode draws only 0.8 µA and maintains data integrity across extended sleep periods, enabling fast context restoration upon wake without reloading from Flash or EEPROM.