STMicroelectronics STM32L051T6Y6TR

Overview

STM32L051T6Y6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 32 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 smart meters requiring sub-µA standby current (0.27 µA) and fast wakeup (3.5 µs from RAM).

For engineers reviewing the STM32L051T6Y6TR datasheet, STM32L051T6Y6TR pinout, STM32L051T6Y6TR application, or STM32L051T6Y6TR equivalent, key selection criteria include verified low-power mode current specs (Stop: 0.4 µA; Standby: 0.27 µA), 32-pin UFQFPN package compatibility, ECC-protected memory architecture, and integrated RTC with 8-KB RAM retention - all confirmed in DS10184 Rev 10.

Technical Context

The STM32L051T6Y6TR implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), running at up to 32 MHz using multiple clock sources: HSI16 (±1%), LSE (32 kHz for RTC), MSI (65 kHz–4.2 MHz), and PLL. Its interconnect matrix routes peripherals-including 2x USART, 4x SPI, 2x I2C, 7-channel DMA, and 9 timers-to the CPU without bus contention.

Ultra-low-power operation is achieved via five dynamic power modes (Run, Sleep, Low-power Run, Low-power Sleep, Stop, Standby), each with distinct voltage regulator states, clock gating, and memory retention options. The device integrates a programmable voltage detector (PVD), brownout reset (BOR) with five thresholds, and hardware-based sector protection for Flash and EEPROM.

Key Specifications

Pinout & Package

STM32L051T6Y6TR is housed in a 32-pin Ultra Thin Fine Pitch Quad Flat No-lead (UFQFPN32) package with 0.5 mm pitch and exposed thermal pad. Pin numbering follows standard counter-clockwise orientation starting from top-left corner (Pin 1 marked by dot or bevel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051T6Y6TR, STM32L071KBT6 offers headroom for future firmware expansion but increases BOM cost, while STM32L011K4T6 reduces memory and eliminates EEPROM - making it viable only where data persistence and code size are strictly bounded.

Availability

STM32L051T6Y6TR 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 across extended product lifecycles.

Supply support for STM32L051T6Y6TR 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 analog products for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding long battery life, robust memory integrity, and certified functional safety - optimized for metering, wearables, and edge-sensing endpoints.

FAQ

What is the maximum operating frequency and core type of STM32L051T6Y6TR?

The STM32L051T6Y6TR uses an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS/MHz. Its maximum frequency is achievable across the full 1.65–3.6 V supply range and –40 to +125 °C temperature span, validated per DS10184 Rev 10 Section 6.3.1.

Does STM32L051T6Y6TR support hardware error correction on its memory?

Yes - both the 32 KB Flash and 2 KB EEPROM include built-in ECC circuitry that detects and corrects single-bit errors and detects double-bit errors. This is implemented in hardware without software overhead and is active during all read/write operations, as specified in Section 2.8 and Table 47 of DS10184 Rev 10.

How many I/O pins are 5V-tolerant on the UFQFPN32 package?

25 of the 29 general-purpose I/Os on the STM32L051T6Y6TR (UFQFPN32) are 5V-tolerant, enabling direct connection to 5V logic peripherals without external level-shifting components. Pin-specific tolerance is documented in Table 15 (Pin Definitions) and Section 6.3.13 of DS10184 Rev 10.

What debug interface does STM32L051T6Y6TR provide, and how many pins does it require?

The device supports Serial Wire Debug (SW-DP) using two dedicated pins: SWDIO (PA13) and SWCLK (PA14). This 2-pin interface provides full debug functionality including breakpoints, memory inspection, and real-time variable monitoring, as confirmed in Section 3.18 and Table 15 of the datasheet.