STMicroelectronics STM32L051C8U6

Overview

STM32L051C8U6 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, and a 12-bit ADC operating up to 1.14 Msps. It delivers 0.95 DMIPS/MHz performance at up to 32 MHz and supports 45 5V-tolerant I/Os. It is deployed in battery-powered sensor nodes requiring sub-µA standby current and fast wake-up for periodic sensing.

For engineers reviewing the STM32L051C8U6 datasheet, STM32L051C8U6 pinout, STM32L051C8U6 application, or STM32L051C8U6 equivalent, key selection criteria include verified ultra-low-power mode current (0.27 µA Standby), RTC + RAM retention capability (0.8 µA), 32 MHz max CPU frequency with dynamic voltage scaling, and dual ultra-low-power comparators with wake-up support down to 1.65 V.

Technical Context

The STM32L051C8U6 integrates an Arm Cortex-M0+ core with Memory Protection Unit (MPU), supporting execution from Flash or RAM, and features a multi-speed internal RC oscillator (65 kHz–4.2 MHz) plus PLL for flexible clock generation. Its power architecture includes five low-power modes-Run, Sleep, Low-power Run, Low-power Sleep, Stop, and Standby-with dedicated voltage regulators and brownout reset (BOR) thresholds.

Analog subsystem includes a 12-bit ADC with up to 16 channels, two independent ultra-low-power comparators (each configurable for window mode or wake-up), and integrated temperature sensor with factory calibration. Peripherals are interconnected via a matrix enabling concurrent DMA transfers across ADC, USART, SPI, I2C, and timers without CPU intervention.

Key Specifications

Pinout & Package

STM32L051C8U6 is housed in a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN32) package measuring 5×5 mm with 0.5 mm pitch, optimized for space-constrained PCB layouts and automated assembly. The package complies with ECOPACK2 environmental standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L071C8U6, the STM32L051C8U6 trades memory headroom for lower unit cost and identical ultra-low-power behavior; versus EFM32PG12B500F1024GL125, it offers integrated EEPROM and simpler toolchain support at the expense of raw compute throughput.

Availability

STM32L051C8U6 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, and portable medical devices requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for STM32L051C8U6 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 where energy efficiency, small form factor, and integrated analog peripherals are critical - especially in battery-operated IoT endpoints and portable instrumentation.

FAQ

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

The STM32L051C8U6 operates at up to 32 MHz using its PLL or HSI16 oscillator. At 32 MHz and 3.3 V, typical current consumption in Run mode is 88 µA/MHz, equating to ~2.82 mA total. This value assumes code execution from Flash with peripheral clocks enabled per DS10184 Rev 10 Section 6.3.4.

Does STM32L051C8U6 support hardware encryption or secure boot features?

No, the STM32L051C8U6 does not include hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. It relies on software-based security implementations. For certified secure boot, ST recommends the STM32L5 series or STM32H5 series, which integrate TrustZone and dedicated security processors.

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

Yes, the 2 KB data EEPROM is designed for persistent storage of calibration coefficients, device IDs, or user settings. It supports 200,000 write/erase cycles and guarantees data retention for 20 years at 85°C (DS10184 Rev 10 Table 48), with built-in ECC to prevent bit errors during read/write operations.

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

Yes, the STM32L051C8U6 in UFQFPN32 packaging meets RoHS Directive 2011/65/EU and is fully lead-free. It carries ST's ECOPACK2 designation, confirming compliance with halogen-free requirements and strict substance restrictions beyond RoHS, including absence of antimony trioxide and beryllium compounds.