STMicroelectronics STM32L051K6U6TR

Overview

STM32L051K6U6TR 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 V to 3.6 V across –40 °C to +125 °C and targets battery-powered IoT sensor nodes requiring sub-µA standby current (0.27 µA) and fast wakeup (3.5 µs from RAM).

For engineers reviewing the STM32L051K6U6TR datasheet, STM32L051K6U6TR pinout, STM32L051K6U6TR application, or STM32L051K6U6TR 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 analog peripherals enabling single-chip sensor interface solutions.

Technical Context

The STM32L051K6U6TR implements a Cortex-M0+ core with Memory Protection Unit (MPU), supporting dynamic voltage scaling for operation up to 32 MHz at 0.95 DMIPS/MHz. Its power management includes five BOR thresholds, programmable voltage detector (PVD), and multiple clock sources: HSE (1–25 MHz), LSE (32 kHz RTC), HSI16 (±1% factory-trimmed), and multispeed MSI (65 kHz–4.2 MHz).

Analog subsystem integration includes a 12-bit ADC with 16-channel multiplexing down to 1.65 V supply, two comparators with window mode and wake-up capability, and internal temperature sensor with calibration data stored in system memory. The interconnect matrix enables concurrent peripheral access via 7-channel DMA supporting ADC, SPI, I²C, USART, and timers.

Key Specifications

Pinout & Package

STM32L051K6U6TR uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package - a space-constrained, surface-mount solution optimized for compact portable and wearable electronics. All pins are accessible on the periphery with no bottom thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051K6U6TR, the C6T6 offers higher I/O count and prototyping flexibility at the expense of board area, while the L031K6U6 reduces Flash and removes EEPROM to lower unit cost-making it viable only where firmware complexity and nonvolatile parameter storage are minimal.

Availability

STM32L051K6U6TR is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, portable medical diagnostics, smart utility metering, and industrial condition monitoring requiring stable component supply and long-term lifecycle assurance.

Supply support for STM32L051K6U6TR 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 automotive semiconductors since 1987.

The STM32L0 series targets ultra-low-power embedded applications, emphasizing energy efficiency, integrated analog functionality, and secure firmware execution for resource-constrained edge devices in industrial, healthcare, and metering markets.

FAQ

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

The STM32L051K6U6TR achieves up to 32 MHz CPU frequency with 88 µA/MHz typical current consumption in Run mode when executing code from Flash. At 32 MHz, this equates to approximately 2.8 mA total active current, verified under 3.3 V supply and 25 °C ambient per DS10184 Rev 10 Section 6.3.4.

Does this MCU support hardware encryption or secure boot features?

No, the STM32L051K6U6TR does not integrate hardware cryptographic accelerators or secure boot ROM. It relies on software-based AES libraries and external secure elements for advanced security; however, its 96-bit unique ID and ECC memory protection provide foundational device identity and data integrity safeguards.

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

Yes, the 2 KB data EEPROM with ECC is specifically designed for parameter storage across power cycles. It supports 100,000 write/erase cycles and 20-year data retention at 55 °C (DS10184 Rev 10 Table 48), making it suitable for storing sensor calibration coefficients, device configuration, or usage counters without external memory.

What debug interfaces are supported, and is SWD compatible with standard tools?

The STM32L051K6U6TR supports Serial Wire Debug (SW-DP) only - no JTAG. It is fully compatible with ST-LINK v2/v3, Segger J-Link, and OpenOCD via standard ARM SWD protocol, using SWCLK and SWDIO pins (PA14/PA13). No additional voltage translation is required for 3.3 V host debuggers.