STMicroelectronics STM32L051K8T6TR

Overview

STM32L051K8T6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 64 KB Flash with ECC, 8 KB SRAM, 2 KB EEPROM, 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, delivering 0.27 µA Standby current and 3.5 µs wakeup from RAM-ideal for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L051K8T6TR datasheet, STM32L051K8T6TR pinout, STM32L051K8T6TR application, or STM32L051K8T6TR equivalent, key selection criteria include verified low-power mode timing (Stop/Standby currents), Flash/ECC retention under voltage scaling, ADC performance at 1.65 V, and pin-compatible migration paths within the L051x8 series.

Technical Context

The STM32L051K8T6TR integrates a Cortex-M0+ core with MPU, supporting dynamic voltage scaling and multiple clock sources: HSI16 (±1%), LSE (32 kHz RTC), MSI (65 kHz–4.2 MHz), and PLL for CPU clock generation. Its interconnect matrix enables concurrent peripheral operation without bus contention.

Ultra-low-power operation is enforced by dedicated power management blocks: BOR with five thresholds, programmable PVD, and independent regulators for digital/analog domains. Memory subsystem includes ECC-protected Flash and EEPROM, plus 20-byte backup registers retained in Standby mode.

Key Specifications

Pinout & Package

STM32L051K8T6TR uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32 leads, optimized for space-constrained PCB layouts and automated assembly. All I/Os are 5V-tolerant except BOOT0 and NRST.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051K8T6TR, the C8T6 offers expanded I/O and package flexibility at the cost of size, while the L071K8T6 trades EEPROM for crypto acceleration and doubled Flash-making it suitable for secure boot but unsuitable for legacy EEPROM-dependent firmware.

Availability

STM32L051K8T6TR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, industrial predictive maintenance, and medical wearable monitors requiring stable component supply across extended product lifecycles.

Supply support for STM32L051K8T6TR 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 devices for industrial, automotive, and consumer markets.

The STM32L0 Access line targets ultra-low-power embedded applications demanding long battery life, robust memory integrity, and integrated analog peripherals-optimized for cost-sensitive, space-constrained IoT endpoints.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM32L051K8T6TR achieves up to 32 MHz CPU frequency using the PLL or HSI16 oscillator. At 32 MHz and 3.3 V supply, typical Run-mode current is 88 µA/MHz (2.82 mA total), measured with code executing from Flash and peripherals active. This value scales linearly with clock speed and drops to 55 µA/MHz when running from SRAM due to eliminated Flash wait states.

Does this MCU support hardware encryption or secure boot features?

No, the STM32L051K8T6TR does not integrate hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. It relies on software-based encryption libraries and standard Flash write protection. For secure firmware validation, designers must implement external secure elements or migrate to the STM32L071 or STM32L4 series, which include dedicated crypto peripherals and secure boot loaders.

How many I/O pins support 5V tolerance, and what are the limitations?

45 of the 51 I/Os on the STM32L051K8T6TR are 5V-tolerant when VDD is ≥2.0 V, including all GPIOs except BOOT0 and NRST. These pins accept input voltages up to 5.5 V regardless of VDD level, enabling direct interfacing with 5V logic, sensors, or displays without level shifters-critical for mixed-voltage system integration.

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

Yes, the 2 KB data EEPROM supports 100,000 write/erase cycles and 20-year data retention at 55 °C, validated per ST's DS10184 Rev 10. It operates down to 1.65 V and retains data in all low-power modes including Standby, making it ideal for storing sensor calibration coefficients, device serial numbers, or usage counters without external NV memory.