STMicroelectronics STM32L051T8Y7DTR

Overview

STM32L051T8Y7DTR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 64 KB Flash, 8 KB SRAM, 2 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and operation down to 1.65 V. It delivers 0.8 µA Stop mode + RTC + RAM retention and 3.5 µs wakeup from RAM-ideal for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L051T8Y7DTR datasheet, STM32L051T8Y7DTR pinout, STM32L051T8Y7DTR application, or STM32L051T8Y7DTR equivalent, key selection criteria include ultra-low standby current (0.27 µA), 45 5V-tolerant I/Os, integrated 32 kHz RTC oscillator with calibration, and support for SWD debug in minimal footprint.

Technical Context

This MCU implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), operating from 32 kHz to 32 MHz using multiple clock sources: HSI16 (±1%), LSI (37 kHz), MSI (65 kHz–4.2 MHz), HSE (1–25 MHz), and LSE (32.768 kHz). Its power architecture supports six low-power modes-including Standby with two wakeup pins and Stop with 16 wakeup lines-enabling precise energy budgeting in constrained deployments.

The peripheral interconnect matrix routes DMA channels to ADC, SPI, I²C, USART, and timers without CPU intervention. Analog subsystem includes two ultra-low-power comparators (operable down to 1.65 V) with window mode and wake-up capability, plus temperature sensor and internal voltage reference (VREFINT) calibrated at factory for accurate ADC measurements.

Key Specifications

Pinout & Package

STM32L051T8Y7DTR uses the UFQFPN32 (5 × 5 mm) package with 0.5 mm pitch and exposed thermal pad. This compact, lead-free ECOPACK2-compliant package supports automated optical inspection and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L071K8U6, STM32L051T8Y7DTR trades memory capacity for lower unit cost and identical ultra-low-power performance; versus STM32L011K4U6, it doubles Flash and quadruples RAM while maintaining the same footprint and power envelope-making it optimal for mid-complexity edge nodes.

Availability

STM32L051T8Y7DTR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, portable medical devices, and industrial predictive maintenance sensors requiring stable component supply and long-term lifecycle assurance.

Supply support for STM32L051T8Y7DTR 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 components for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications where energy efficiency, small footprint, and integrated analog peripherals are critical-enabling battery-operated devices with multi-year lifetimes and minimal external component count.

FAQ

What is the maximum operating frequency of the STM32L051T8Y7DTR?

The STM32L051T8Y7DTR operates at up to 32 MHz using its internal HSI16 oscillator (±1% accuracy) or external HSE crystal. Frequency scaling is supported via dynamic voltage scaling to maintain stability across 1.65–3.6 V supply range, with guaranteed performance at all voltages within this band.

Does STM32L051T8Y7DTR support hardware encryption or secure boot?

No, the STM32L051T8Y7DTR does not include hardware cryptographic accelerators or secure boot features. It lacks AES, PKA, or TRNG modules found in higher-tier STM32L4/L5 series. Security relies on software-based implementations or external secure elements for key storage and authentication.

Can the 2 KB EEPROM be used for storing calibration data across power cycles?

Yes-the 2 KB on-chip EEPROM is rated for 100,000 write/erase cycles and 20-year data retention at 55 °C. It supports byte-level writes and includes ECC for bit-error correction, making it suitable for storing sensor calibration coefficients, device IDs, or configuration parameters that must survive power loss.

Is the UFQFPN32 package of STM32L051T8Y7DTR compatible with reflow soldering per JEDEC J-STD-020?

Yes-the UFQFPN32 package is qualified for standard Pb-free reflow profiles per JEDEC J-STD-020D. Peak temperature is rated at 260 °C for 30 seconds, with ramp rates ≤3 °C/s. The exposed thermal pad must be soldered to a solid copper pour for thermal and mechanical reliability.