STMicroelectronics STM32L051K8U6TR

Overview

STM32L051K8U6TR 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 0.95 DMIPS/MHz performance at up to 32 MHz and supports industrial temperature range (−40 to +125 °C), targeting battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM32L051K8U6TR datasheet, STM32L051K8U6TR pinout, STM32L051K8U6TR application, or STM32L051K8U6TR equivalent, key selection criteria include standby current (0.27 µA), RTC+RAM retention in Stop mode (0.8 µA), wakeup time from Flash (5 µs), and 45 I/Os with 5V tolerance - all critical for energy-constrained embedded designs.

Technical Context

The STM32L051K8U6TR integrates a Cortex-M0+ core with Memory Protection Unit (MPU), supporting dynamic voltage scaling across three power ranges (1.65–3.6 V). Its clock system combines multiple internal oscillators (HSI16, LSI, MSI) and external sources (1–25 MHz HSE, 32 kHz LSE), enabling precise low-power timing via RTC calibration and ultra-low-power timer (LPTIM).

Power management includes five BOR thresholds, programmable voltage detector (PVD), and three low-power modes (Stop, Standby, Shutdown) with configurable wakeup sources - 2 pins in Standby, 16 lines in Stop - while retaining RAM, RTC, and backup registers. Analog subsystem comprises two comparators with window mode and wake capability, plus temperature sensor and VREFINT reference.

Key Specifications

Pinout & Package

STM32L051K8U6TR uses UFQFPN32 (5×5 mm, 0.5 mm pitch) package with 32-pin layout optimized for compact PCB footprint and thermal performance in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051K8U6TR, STM32L071K8U6TR offers scalable memory without compromising ultra-low-power operation, while STM32L412K8U6TR shifts focus to compute-intensive tasks at the expense of standby efficiency - making the L051 optimal for pure energy-constrained sensing.

Availability

STM32L051K8U6TR is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply across long product lifecycles.

Supply support for STM32L051K8U6TR 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 components for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust memory reliability, and integrated analog functionality - optimized for IoT endpoints and portable medical devices.

FAQ

What is the maximum operating frequency and corresponding supply voltage range?

The STM32L051K8U6TR operates up to 32 MHz at 3.0–3.6 V supply. At lower voltages, maximum frequency scales down: 24 MHz at 2.4–2.99 V, and 16 MHz at 1.65–2.39 V. This dynamic voltage scaling is managed automatically by the internal regulator to maintain stability and minimize power consumption across varying battery states.

Does this MCU support hardware encryption or secure boot features?

No, the STM32L051K8U6TR does not include hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. It relies on software-based security implementations. For certified secure boot or hardware crypto, consider STM32L5 or STM32U5 series MCUs, which integrate ARM TrustZone and dedicated security peripherals.

Can the 2 KB EEPROM be used for parameter storage without wear leveling?

Yes - the 2 KB data EEPROM has built-in wear leveling controlled by hardware, supporting up to 100,000 write/erase cycles per sector. Each byte can be written independently, and the EEPROM driver library (ST HAL) handles address translation and erase management transparently, eliminating need for custom firmware-level wear leveling.

Is the UFQFPN32 package RoHS-compliant and halogen-free?

Yes, STM32L051K8U6TR in UFQFPN32 package meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. It carries ECOPACK2 certification, confirming compliance with ST's environmental policy for lead-free assembly and restricted substance control.