STMicroelectronics STM32L051C6T6TR

Overview

STM32L051C6T6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 32 KB Flash, 8 KB SRAM, 2 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and operation down to 1.65 V. It delivers 0.8 µA Stop mode + RTC + RAM retention and supports 45 5V-tolerant I/Os for battery-powered sensor nodes and smart meters.

For engineers reviewing the STM32L051C6T6TR datasheet, STM32L051C6T6TR pinout, STM32L051C6T6TR application, or STM32L051C6T6TR equivalent, key selection criteria include ultra-low-power mode timing (3.5 µs wakeup from RAM), integrated EEPROM endurance (100k cycles), dual ultra-low-power comparators with wake-up capability, and support for ISO 7816/IRDA via USART.

Technical Context

The STM32L051C6T6TR implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), operating from 32 kHz to 32 MHz using multiple clock sources: HSI16 (±1%), LSE (32.768 kHz RTC), MSI (65 kHz–4.2 MHz), and PLL. Its power architecture includes five low-power modes-Run, Sleep, Low-power Run, Low-power Sleep, Stop, and Standby-with dedicated voltage regulators and brownout reset (BOR) thresholds.

Analog subsystem integration includes a 12-bit ADC with up to 16 channels, two independent ultra-low-power comparators (operable down to 1.65 V), internal temperature sensor, and VREFINT reference-all accessible in Stop mode with RAM retention. The interconnect matrix enables concurrent peripheral operation without CPU intervention via a 7-channel DMA controller.

Key Specifications

Pinout & Package

STM32L051C6T6TR uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32 leads, compliant with ECOPACK2 environmental standards. Pin functions are validated per STMicroelectronics datasheet DS10184 Rev 10, Section 4 "Pin descriptions".

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051K6U6, the STM32L051C6T6TR offers superior thermal dissipation and PCB assembly yield in industrial settings; versus STM32L071C8T6, it provides optimal cost/power balance for non-USB, resource-constrained edge nodes where 32 KB Flash suffices.

Availability

STM32L051C6T6TR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, portable medical devices, and industrial control panels requiring stable component supply across multi-year production cycles.

Supply support for STM32L051C6T6TR 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 automotive SoCs since 1987.

The STM32L0 series targets ultra-low-power embedded applications - specifically battery-operated IoT endpoints, energy meters, and portable medical equipment - with emphasis on sub-1 µA deep-sleep operation and integrated analog precision.

FAQ

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

The STM32L051C6T6TR operates up to 32 MHz when supplied between 2.4 V and 3.6 V. At lower voltages (1.65–2.4 V), maximum frequency is reduced to 16 MHz per dynamic voltage scaling. All frequency/voltage combinations are specified in Section 6.3.1 of DS10184 Rev 10, with guaranteed timing margins across -40°C to +125°C.

Does this MCU support hardware encryption or secure boot features?

No, the STM32L051C6T6TR does not integrate hardware AES, PKA, or secure boot ROM. It relies on software-based cryptographic libraries. For hardware security, ST recommends the STM32L071 or STM32L4 series, which include AES-128 accelerators and secure firmware installation (SFI) mechanisms.

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

Yes - the 2 KB data EEPROM is embedded, ECC-protected, and supports 100,000 write/erase cycles with 40-year data retention at 55°C. It is accessed via standard HAL drivers (HAL_FLASHEx_DATAEEPROM_Unlock/Write/Read) and requires no external memory or charge pumps.

Is the UFQFPN32 package RoHS and REACH compliant?

Yes, the STM32L051C6T6TR in UFQFPN32 packaging meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. It is also ECOPACK2 certified, confirming halogen-free materials and lead-free terminations compliant with JEDEC J-STD-020 moisture sensitivity level 3 (MSL3).