STMicroelectronics STM32L051T8Y6DTR

Overview

STM32L051T8Y6DTR 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 sensor nodes and smart meters.

For engineers reviewing the STM32L051T8Y6DTR datasheet, STM32L051T8Y6DTR pinout, STM32L051T8Y6DTR application, or STM32L051T8Y6DTR equivalent, key selection criteria include standby current (0.27 µA), wakeup time from Flash (5 µs), 45 I/Os with 5V tolerance, and integrated RTC with 8-KB RAM retention in Stop mode.

Technical Context

The STM32L051T8Y6DTR implements a single-core Arm Cortex-M0+ with MPU, running at up to 32 MHz via internal 16 MHz RC (±1%) or external crystal (1–25 MHz). Its low-power architecture supports six power modes - including Standby (0.27 µA), Stop (0.4 µA), and Run (88 µA/MHz) - with configurable voltage scaling and brownout reset thresholds.

Analog integration includes a 16-channel 12-bit ADC operating down to 1.65 V, two comparators with window mode and wake-up capability, and an internal temperature sensor with factory calibration. Peripherals are routed through a dedicated interconnect matrix supporting concurrent DMA transfers for ADC, USART, SPI, I²C, and timers.

Key Specifications

Pinout & Package

STM32L051T8Y6DTR uses a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN) package, 5 × 5 mm, 0.5 mm pitch, with exposed thermal pad. Pin assignments conform to ST's standard T-series pinout for LQFP32/UFQFPN32 variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L071K8T6, the STM32L051T8Y6DTR trades memory capacity for identical ultra-low-power performance and smaller UFQFPN32 packaging; versus STM32L011F4P6, it adds EEPROM, more I/Os, and higher ADC resolution - making it optimal for mid-complexity, battery-limited sensing systems requiring data persistence.

Availability

STM32L051T8Y6DTR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, portable medical devices, and asset tracking tags requiring stable component supply and long-term industrial lifecycle support.

Supply support for STM32L051T8Y6DTR 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, specializing in microcontrollers, power management, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.

The STM32L0 series is designed specifically for ultra-low-power embedded applications demanding multi-year battery life, robust memory integrity, and integrated analog peripherals - targeting IoT edge nodes and energy-harvesting systems.

FAQ

What is the maximum operating frequency and clock source flexibility of the STM32L051T8Y6DTR?

The STM32L051T8Y6DTR runs at up to 32 MHz using its internal 16 MHz HSI oscillator (±1% factory-trimmed), external 1–25 MHz crystal, or PLL derived from either source. The multispeed internal MSI (65 kHz–4.2 MHz) and 37 kHz LSI provide additional low-power clock options for RTC and watchdogs without external components.

Does the STM32L051T8Y6DTR support hardware error correction for memory reliability?

Yes - both 64 KB Flash and 2 KB EEPROM include built-in hardware ECC (Error Correction Code), detecting and correcting single-bit errors and detecting double-bit errors. This eliminates software-level checksum overhead and ensures firmware/data integrity in harsh electromagnetic environments typical of industrial metering.

How many I/O pins are 5V-tolerant, and what is their functional scope?

45 of the 51 I/Os are 5V-tolerant, covering all GPIO ports (PA0–PA15, PB0–PB11, plus specific alternate function pins). These support full-speed digital communication (USART, SPI, I²C), analog input (ADC channels), comparator inputs, and external interrupt generation - enabling direct interfacing with legacy 5 V logic and sensors without level shifters.

What low-power modes are available, and how do wakeup sources differ between them?

The device offers Standby (0.27 µA, 2 wakeup pins), Stop (0.4 µA, 16 wakeup lines), and Stop with RTC+RAM retention (0.8 µA). Wakeup sources include EXTI lines, RTC alarms, comparator events, and USART start bits. In Standby, only NRST and two dedicated pins can wake the device; in Stop, any configured EXTI line or peripheral event triggers recovery in ≤5 µs from Flash.