STMicroelectronics STM32L051R8T6TR

Overview

STM32L051R8T6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 64 KB Flash, 8 KB SRAM, 2 KB EEPROM, 12-bit ADC (1.14 Msps), and operating voltage range of 1.65–3.6 V. It delivers 0.95 DMIPS/MHz performance at up to 32 MHz and supports 51 fast I/Os (45 tolerant to 5 V), targeting battery-powered IoT sensors and portable medical devices.

For engineers reviewing the STM32L051R8T6TR datasheet, STM32L051R8T6TR pinout, STM32L051R8T6TR application, or STM32L051R8T6TR equivalent, key selection criteria include standby current (0.27 µA), RTC + RAM retention in Stop mode (0.8 µA), wakeup time (3.5 µs from RAM), ECC-protected memory, and integrated ultra-low-power comparators with wake-up capability down to 1.65 V.

Technical Context

This MCU implements a dual-voltage domain architecture with dynamic voltage scaling to optimize power across Run, Sleep, Stop, and Standby modes. Its Cortex-M0+ core includes a Memory Protection Unit (MPU), and the clock system integrates multiple internal oscillators (HSI16, LSI, MSI) plus external crystal support (1–25 MHz HSE, 32 kHz LSE) for precise RTC calibration.

Analog subsystem integration includes two independent ultra-low-power comparators (with window mode and wake-up), a 12-bit ADC with up to 16 channels and hardware oversampling, and a calibrated temperature sensor - all functional down to 1.65 V supply, enabling operation across full industrial temperature range (−40 to +125 °C).

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), 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 STM32L051R8T6TR, STM32L071R8T6 offers scalable memory without power penalty, while STM32L431RCI6 introduces floating-point acceleration at the cost of 3× higher Run-mode current - making the L051 optimal for energy-constrained, event-driven sensing where deterministic low-power operation is non-negotiable.

Availability

STM32L051R8T6TR is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless nodes, and asset tracking beacons requiring stable component supply and long-term lifecycle assurance.

Supply support for STM32L051R8T6TR 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, specializing in microcontrollers, power management, analog, and MEMS technologies with strong focus on industrial, automotive, and IoT markets.

The STM32L0 series is designed specifically for ultra-low-power embedded applications demanding multi-year battery life, robust memory integrity, and seamless integration of analog peripherals - targeting metering, wearables, and remote sensing.

FAQ

What is the maximum operating frequency and corresponding power supply requirement?

The STM32L051R8T6TR operates up to 32 MHz when supplied at 3.0–3.6 V. At lower voltages (1.65–1.98 V), maximum frequency is reduced to 16 MHz per dynamic voltage scaling specifications. All frequencies are supported with internal HSI16 (±1%) or PLL-derived clocks; external crystal is optional but recommended for RTC accuracy.

Does this MCU support hardware encryption or secure boot features?

No, the STM32L051R8T6TR does not include hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. It provides a 96-bit unique ID and ECC protection for Flash and EEPROM, but secure firmware validation must be implemented in software using external trusted elements or higher-series MCUs like STM32L5.

Can the 2 KB EEPROM be used for parameter storage across power cycles without external components?

Yes, the integrated 2 KB data EEPROM is fully functional across the entire operating voltage range (1.65–3.6 V) and retains data for 40k write/erase cycles with 20-year data retention at 55 °C. No external capacitor or backup supply is needed - it uses the same VDD rail and is managed via dedicated HAL drivers.

Is the LQFP48 package RoHS-compliant and lead-free?

Yes, the STM32L051R8T6TR in LQFP48 package is RoHS-compliant and lead-free, certified under ST's ECOPACK2 environmental standard. The device meets JEDEC J-STD-020 moisture sensitivity level MSL3 and supports standard Pb-free reflow profiles (peak 260 °C).