STMicroelectronics STM32L051K6T6

Overview

STM32L051K6T6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in LQFP32 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 delivers 0.4 µA Stop mode current with 16 wakeup lines-ideal for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L051K6T6 datasheet, STM32L051K6T6 pinout, STM32L051K6T6 application, or STM32L051K6T6 equivalent, key selection criteria include verified low-power mode timing (3.5 µs RAM wakeup), 45 I/Os with 5V tolerance, integrated RTC + backup registers, and pre-programmed USART/SPI bootloader support for field firmware updates.

Technical Context

The STM32L051K6T6 implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), running at up to 32 MHz using multiple clock sources: 16 MHz factory-trimmed HSI (±1%), 32 kHz LSE for RTC calibration, and PLL for CPU clock scaling. Its interconnect matrix routes peripherals-including ADC, timers, and communication interfaces-to the core without arbitration bottlenecks.

Power management integrates five BOR thresholds, programmable voltage detector (PVD), and dynamic voltage scaling to enable six low-power modes: Run, Sleep, Low-power Run, Low-power Sleep, Stop, and Standby-with retention of 8 KB RAM and RTC in Stop mode at 0.8 µA.

Key Specifications

Pinout & Package

LQFP32 (7 × 7 mm, 0.8 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051C6T6, the K6T6 saves PCB area and BOM cost in space-constrained designs; versus STM32L071K6T6, it trades crypto capability and memory for optimized bill-of-materials in cost-sensitive, functionally bounded applications.

Availability

STM32L051K6T6 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, portable medical devices, and industrial control panels requiring stable component supply across extended product lifecycles.

Supply support for STM32L051K6T6 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-grade components since 1987.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust memory integrity, and industrial temperature resilience-optimized for metering, wearables, and sensor edge nodes.

FAQ

What is the maximum operating frequency and core architecture of the STM32L051K6T6?

The STM32L051K6T6 features an Arm Cortex-M0+ core rated for up to 32 MHz operation. It includes a Memory Protection Unit (MPU) and executes instructions at 0.95 DMIPS/MHz. The core supports Thumb-2 instruction set and integrates tightly coupled NVIC for deterministic interrupt response in real-time applications.

Does the STM32L051K6T6 support hardware encryption or secure boot features?

No, the STM32L051K6T6 does not include hardware AES, PKA, or secure boot engines. It lacks dedicated cryptographic accelerators found in the STM32L071/L081 variants. Secure firmware updates must rely on software-based signing verification or external secure elements interfaced via I2C or SPI.

Can the internal 32 kHz LSE oscillator be calibrated, and what is its typical accuracy?

Yes, the LSE oscillator driving the RTC can be calibrated using the RCC_LSECLKCALIB register, adjusting frequency in ±10 ppm steps. Factory-trimmed accuracy is ±20 ppm at 25 °C and ±30 ppm over –40 to +85 °C, meeting requirements for metering timekeeping and periodic wakeup scheduling.

How many I/O pins are 5V tolerant, and which specific pins support this feature?

45 of the 48 general-purpose I/Os on the STM32L051K6T6 are 5V tolerant when configured in input, output, or alternate function modes. This includes all pins in Port A (PA0–PA15), Port B (PB0–PB15), and Port C (PC0–PC15), excluding NRST, BOOT0, and VDDA/VSSA analog supply pins.