STMicroelectronics STM32L051C8T6TR

Overview

STM32L051C8T6TR 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 V to 3.6 V across –40 °C to +125 °C and targets battery-powered IoT sensors and smart metering endpoints requiring sub-µA standby current (0.27 µA) and fast wakeup (3.5 µs from RAM).

For engineers reviewing the STM32L051C8T6TR datasheet, STM32L051C8T6TR pinout, STM32L051C8T6TR application, or STM32L051C8T6TR equivalent, key selection criteria include its 0.4 µA Stop mode current, 45 5V-tolerant I/Os, integrated RTC with 8-KB RAM retention, and pre-programmed USART/SPI bootloader for secure firmware updates in constrained embedded systems.

Technical Context

The device implements a tightly coupled Cortex-M0+ core with Memory Protection Unit (MPU), supporting dynamic voltage scaling and clock gating to achieve ultra-low active and sleep power states. Its interconnect matrix enables concurrent peripheral operation-including simultaneous ADC sampling, DMA transfers, and UART transmission-without CPU intervention.

Power management integrates five BOR thresholds, programmable voltage detector (PVD), and multiple internal oscillators (HSI16, LSI, MSI, LSE) with automatic clock switching. The low-power real-time clock (RTC) maintains timekeeping with 2 KB EEPROM and 20-byte backup registers during Standby mode.

Key Specifications

Pinout & Package

STM32L051C8T6TR uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32-pin layout optimized for compact PCB designs and automated assembly. All pins support standard 3.3 V logic levels unless configured for 5V-tolerant operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051C8T6TR, STM32L071C8T6 offers headroom for future firmware expansion but increases BOM cost, while STM32L011K4T6 reduces silicon area and price at the expense of EEPROM-based data logging and sensor channel count.

Availability

STM32L051C8T6TR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, industrial predictive maintenance, and medical wearable patches requiring stable component supply across extended product lifecycles.

Supply support for STM32L051C8T6TR 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, and analog/mixed-signal solutions for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust security, and seamless integration with wireless connectivity modules-optimized for IoT edge nodes and portable medical devices.

FAQ

What is the maximum operating frequency and corresponding supply voltage range?

The STM32L051C8T6TR achieves up to 32 MHz CPU frequency within the 1.65 V to 3.6 V supply range, enabled by dynamic voltage scaling and factory-trimmed 16 MHz HSI oscillator (±1% accuracy). At 32 MHz, it requires ≥3.0 V supply per datasheet Table 4 and Section 6.3.1; lower frequencies (e.g., 16 MHz) are supported down to 1.65 V.

Does this MCU support hardware encryption or secure boot features?

No, the STM32L051C8T6TR does not integrate hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. Security relies on software-based implementations or external secure elements. For hardware-assisted security, ST recommends the STM32L5 series with ARM TrustZone and AES-256.

How many I/O pins support 5V tolerance, and what is the absolute maximum rating?

45 of the 51 I/O pins are 5V tolerant when configured in input, output, or alternate function modes, as confirmed in Section 3.7 and Table 54 of DS10184 Rev 10. Absolute maximum rating for 5V-tolerant pins is VDD + 4 V (max 7 V), with DC injection current limited to ±5 mA per pin per Section 6.3.12.

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

Yes-the 2 KB data EEPROM includes ECC protection and guarantees 100,000 write/erase cycles with 20-year data retention at 55 °C (Section 6.3.9, Table 48). It is accessed via dedicated PEC (Program/Erase Controller) registers and supports byte/word writes, making it ideal for storing sensor calibration coefficients or device-specific configuration parameters.