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STMicroelectronics STM32L051R8T6 — Microcontrollers & Processors (MCU / MPU / DSP)

STM32L051R8T6 MCU, ARM Cortex-M0+, 32 MHz, 64 KB Flash

MPNSTM32L051R8T6
Active

STMicroelectronics STM32L051R8T6, ARM Cortex-M0+, 32-Bit Single-Core MCU, 32 MHz, 64 KB Flash, 8K x 8 RAM, 2K x 8 EEPROM, 51 I/O, 64-LQFP, -40°C to 85°C, 1.65 V to 3.6 V.

$4.5000Ref. price · indicative, final on quote
STMicroelectronics STM32L051R8T6 datasheet (PDF)
Packaging64-LQFP
RoHSROHS3 Compliant
SeriesSTM32L0
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STM32L051R8T6 specifications
ParameterValue
SeriesSTM32L0
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.65V ~ 3.6V
Operating temperature-40°C ~ 85°C (TA)
Speed32MHz
PackageTray
RAM size8K x 8
Core size32-Bit Single-Core
EEPROM size2K x 8
PeripheralsBrown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
ConnectivityI²C, IrDA, SPI, UART/USART
Number of i (O)51
Core processorARM® Cortex®-M0+
Case64-LQFP
Data convertersA/D 16x12b
Program memory size64KB (64K x 8)

Product details

At the low end, the 1.65 V minimum supports operation deep into battery discharge, extending run time in portable designs.

Memory sizing for firmware and data storage

The 2 KB of embedded EEPROM (2K x 8) is a practical advantage: calibration constants, node addresses, and production trim values can be stored without an external serial EEPROM, reducing BOM count and board area. The EEPROM endurance is rated for 100k cycles per sector, sufficient for frequent parameter updates over a ten-year service life.

Package and footprint — 64-LQFP (10x10 mm)

The exposed paddle (if present) should be connected to a ground plane with thermal vias for best heat transfer.

STMicroelectronics lists the STM32L051R8T6 as Active. No second-source alternate is recorded in the official cross-reference; the STM32L151CBU6A (Cortex-M3, 32 MHz, 64-LQFP) is a functional peer but not pin-compatible — it adds USB and a DAC but reduces I/O count to 37.

Frequently asked questions

What is the difference between STM32L051R8T6 and STM32L053R8T6?

The STM32L053R8T6 is a close sibling in the same STM32L0 series, sharing the same Cortex-M0+ core, 32 MHz speed, 64 KB Flash, and 64-LQFP package. The L053 adds a 12-bit DAC and a capacitive sensing peripheral (TSC) not present on the L051. If your application does not need the DAC or touch sensing, the L051 is a cost-effective drop-in.

What are the alternatives to STM32L051R8T6?

The STM32L151CBU6A is a functional peer from the STM32L1 series, running the same 32 MHz clock but on a Cortex-M3 core. It adds USB and a 2-channel 12-bit DAC, but reduces I/O to 37 and comes in a 64-UFQFPN package — not pin-compatible with the 64-LQFP of the L051. For a drop-in replacement within the STM32L0 family, consider the STM32L053R8T6 if you need DAC or touch sensing.