STMicroelectronics STM32L051R6H6

Overview

STM32L051R6H6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in a 64-pin LQFP 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 V to 3.6 V across –40 °C to +125 °C and delivers 0.27 µA standby current with 2 wakeup pins - ideal for battery-powered IoT sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L051R6H6 datasheet, STM32L051R6H6 pinout, STM32L051R6H6 application, or STM32L051R6H6 equivalent, key selection criteria include verified low-power mode timing (3.5 µs RAM wakeup), ECC-protected memory integrity, 45 5V-tolerant I/Os, and integrated RTC with calibration - all confirmed in DS10184 Rev 10.

Technical Context

The STM32L051R6H6 implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), supporting dynamic voltage scaling and clock gating to sustain sub-µA operation in Stop/Standby modes. Its interconnect matrix routes peripherals-including two USARTs (one ISO 7816/IrDA-capable), two I²C, four SPI, and seven timers-to the CPU without arbitration bottlenecks.

Power management integrates five BOR thresholds, programmable voltage detector (PVD), and independent low-power regulators enabling stable operation down to 1.65 V. Analog subsystem includes calibrated temperature sensor, internal 1.22 V reference (VREFINT), and dual comparators with window mode and wake-up capability-each functional at minimum supply voltage.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 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 STM32L051K6U6, the STM32L051R6H6 offers 13 additional 5V-tolerant I/Os and LQFP64 mechanical stability for industrial connectors; versus STM32L071R6H6, it trades 32 KB Flash and 12 KB SRAM for lower unit cost and reduced code size overhead in fixed-function sensor nodes.

Availability

STM32L051R6H6 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, medical wearable patches, and asset tracking beacons requiring stable component supply over extended product lifecycles.

Supply support for STM32L051R6H6 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 ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

The STM32L0 Access line targets ultra-low-power embedded applications demanding sub-µA standby, integrated EEPROM, and robust analog peripherals - optimized for battery-operated endpoints in metering, healthcare, and IoT infrastructure.

FAQ

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

The STM32L051R6H6 achieves 32 MHz maximum CPU frequency using the HSI16 PLL. At this speed, typical current consumption is 88 µA/MHz (2.82 mA total) with code executing from Flash at 3.3 V, as measured per DS10184 Rev 10 Section 6.3.4. This value assumes all peripherals disabled except core and flash interface.

Does the device support hardware encryption or secure boot features?

No. The STM32L051R6H6 does not integrate hardware AES, PKA, or secure boot ROM. It relies on software-based cryptographic libraries and external secure elements for authentication. Secure firmware updates require external trusted execution environment or companion security ICs per ST's AN4821 guidelines.

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

Yes. The 2 KB data EEPROM is rated for 100,000 write/erase cycles and 20-year data retention at 55 °C (DS10184 Table 48). It supports byte/word programming and sector protection, making it suitable for storing sensor calibration coefficients, device serial numbers, and configuration flags that must survive battery removal.

Is the LQFP64 package pinout compatible with other STM32L051 variants like the R8 or C6?

Yes - the STM32L051R6H6 shares identical pinout and electrical characteristics with all STM32L051x6 LQFP64 variants (e.g., STM32L051R8H6), differing only in Flash size (32 KB vs 64 KB) and temperature grade. Pin compatibility enables drop-in replacement during prototyping or qualification without PCB revision.