STMicroelectronics STM32L051K6T6TR

Overview

STM32L051K6T6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 32 MHz max CPU frequency, 32 KB Flash with ECC, 8 KB SRAM, and 2 KB EEPROM. It integrates a 12-bit ADC (1.14 Msps), two ultra-low-power comparators, seven timers including RTC and LPTIM, and communication interfaces including 2× USART, 1× LPUART, 2× I²C, and up to 4× SPI - deployed in battery-powered IoT sensors and smart metering endpoints.

For engineers reviewing the STM32L051K6T6TR datasheet, STM32L051K6T6TR pinout, STM32L051K6T6TR application, or STM32L051K6T6TR equivalent, key selection criteria include standby current (0.27 µA), wakeup time from RAM (3.5 µs), 5V-tolerant I/O count (45 pins), EEPROM endurance (100k cycles), and support for SWD debug interface in space-constrained designs.

Technical Context

The STM32L051K6T6TR implements dynamic voltage scaling and multiple low-power modes (Stop, Standby, Low-power Run) managed by an integrated ultra-safe BOR with five thresholds and programmable voltage detector (PVD). Its interconnect matrix routes peripherals-including ADC, DMA, and timers-to the Cortex-M0+ core without bus contention.

Clock architecture includes factory-trimmed 16 MHz HSI (±1%), 32 kHz LSE for RTC calibration, and PLL for CPU clock generation. Memory subsystem features ECC on Flash and EEPROM, plus 20-byte backup registers retained in Standby mode with V_BAT supply.

Key Specifications

Pinout & Package

STM32L051K6T6TR uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package - a compact, exposed-pad surface-mount solution optimized for thermal dissipation and board space efficiency in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051K6T6TR, STM32L071K8T6 offers headroom for complex protocol stacks but increases cost and power in idle states, while STM32L011K4T6 reduces BOM cost and footprint at the expense of EEPROM-based calibration persistence and ADC channel count.

Availability

STM32L051K6T6TR is available at Aetrix Electronics and suitable for smart metering, wireless sensor networks, portable medical devices, and industrial HMI panels requiring stable component supply across multi-year production cycles.

Supply support for STM32L051K6T6TR 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, MEMS, and automotive semiconductors since 1987.

The STM32L0 series targets ultra-low-power embedded applications - specifically engineered for battery-operated and energy-harvesting systems where sub-µA standby current, fast wake-up, and integrated EEPROM are critical design requirements.

FAQ

What is the maximum operating temperature range for STM32L051K6T6TR?

The STM32L051K6T6TR is rated for -40 °C to +125 °C ambient operation, validated per JEDEC JESD47 stress testing. This extended range supports deployment in automotive under-hood modules, industrial motor drives, and outdoor utility infrastructure without derating.

Does STM32L051K6T6TR support hardware encryption or secure boot?

No - the STM32L051K6T6TR does not include hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. Security relies on software-implemented algorithms and external secure elements; for hardware security, consider STM32L4 or STM32H5 series MCUs.

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

Yes - the 2 KB EEPROM is designed for persistent storage with 100,000 write/erase cycles and 40-year data retention at 55 °C. It supports byte-level writes and ECC protection, making it suitable for sensor calibration coefficients, device IDs, and configuration parameters that must survive power loss.

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

Yes - STM32L051K6T6TR in UFQFPN32 packaging meets RoHS Directive 2011/65/EU and is fully lead-free. It carries ST's ECOPACK2 environmental compliance certification, including halogen-free materials and conformal coating compatibility for harsh-environment PCB assembly.