STMicroelectronics STM32L051R8H6TR

Overview

STM32L051R8H6TR 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 45 5V-tolerant I/Os - deployed in battery-powered sensor nodes and portable medical devices requiring sub-µA standby current (0.27 µA).

For engineers reviewing the STM32L051R8H6TR datasheet, STM32L051R8H6TR pinout, STM32L051R8H6TR application, or STM32L051R8H6TR equivalent, key selection criteria include verified ultra-low-power mode timing (3.5 µs RAM wakeup), ECC-protected memory integrity, dual ultra-low-power comparators with wake-up capability down to 1.65 V, and ISO 7816/IRDA-ready USART support.

Technical Context

The STM32L051R8H6TR integrates an Arm Cortex-M0+ core with Memory Protection Unit (MPU), supporting dynamic voltage scaling across three power ranges and enabling operation from 32 kHz to 32 MHz. Its clock system combines multiple internal RC oscillators (HSI16, LSI, MSI), a 32 kHz RTC oscillator with calibration, and external crystal support (1–25 MHz).

Low-power architecture includes five operational modes: Run, Sleep, Low-power Run, Low-power Sleep, Stop, and Standby - each with distinct peripheral availability and current consumption profiles. The device features a 7-channel DMA controller tightly coupled to ADC, SPI, I2C, USART, and timers for autonomous data movement without CPU intervention.

Key Specifications

Pinout & Package

STM32L051R8H6TR is housed in a 64-pin LQFP package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant and ECOPACK2 certified. Pin functions are defined per STM32L051x6/x8 datasheet Section 4 (Pin descriptions) and Table 15 (pin definitions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051R8H6TR, STM32L071RBT6 provides USB and memory headroom at marginally higher static current, while STM32L011K4T6 sacrifices memory and I/O count for smaller size and lower unit cost - all three share identical low-power mode behavior and peripheral compatibility within their respective feature sets.

Availability

STM32L051R8H6TR is available at Aetrix Electronics and suitable for battery-powered sensor nodes, portable medical monitors, and industrial IoT edge devices requiring stable component supply and long-term lifecycle assurance.

Supply support for STM32L051R8H6TR 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, sensors, and analog components for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications, emphasizing sub-µA standby operation, integrated EEPROM, and robust analog peripherals - optimized for energy-harvesting and battery-critical systems.

FAQ

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

The STM32L051R8H6TR achieves 32 MHz maximum CPU frequency only when VDD is ≥2.4 V and Dynamic Voltage Scaling (DVS) is set to Range 1. At 1.8–2.4 V (Range 2), max frequency drops to 24 MHz; below 1.8 V (Range 3), it is limited to 16 MHz. These constraints are enforced by hardware and documented in Section 6.3.1 of DS10184 Rev 10.

Does this MCU support hardware encryption or secure boot features?

No, the STM32L051R8H6TR does not include hardware AES, PKA, or secure boot circuitry. It lacks dedicated cryptographic accelerators and ROM-based secure bootloader. Security relies on software-implemented algorithms and Flash readout protection (RDP Level 1/2), as specified in Section 3.9 and Section 6.3.9 of the datasheet.

Can the 2 KB EEPROM be used for storing calibration coefficients or configuration parameters?

Yes - the 2 KB data EEPROM supports byte/word/phrase erase and write operations with ECC, endurance of 100,000 cycles, and data retention of 20 years at 85°C (DS10184 Rev 10, Table 48). It is explicitly designed for nonvolatile storage of calibration data, device IDs, and user settings independent of Flash memory.

Is the LQFP64 package RoHS-compliant and lead-free?

Yes, the STM32L051R8H6TR in LQFP64 package is RoHS-compliant and lead-free, certified under ST's ECOPACK2 environmental standard. Package mechanical data (Section 7.1) confirms Pb-free terminations and halogen-free molding compound, compliant with JEDEC J-STD-020 moisture sensitivity level 3.