STMicroelectronics STM32L051K8T7

Overview

STM32L051K8T7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 64 KB Flash with ECC, 8 KB SRAM, 2 KB EEPROM, 12-bit ADC (1.14 Msps), and dual ultra-low-power comparators. It operates from 1.65–3.6 V across –40 to +125 °C and targets battery-powered IoT sensors and smart meters requiring sub-µA standby current (0.27 µA) and fast wakeup (3.5 µs from RAM).

For engineers reviewing the STM32L051K8T7 datasheet, STM32L051K8T7 pinout, STM32L051K8T7 application, or STM32L051K8T7 equivalent, key selection criteria include verified low-power mode current specs (Stop: 0.4 µA; Standby: 0.27 µA), 32-pin UFQFPN package compatibility, 32 MHz max CPU frequency with 0.95 DMIPS/MHz, and integrated peripherals including 2× USART, 2× I2C, 4× SPI, and 9× timers - all confirmed per DS10184 Rev 10.

Technical Context

The STM32L051K8T7 implements a tightly coupled Arm Cortex-M0+ core with Memory Protection Unit (MPU), supporting dynamic voltage scaling for optimized power/performance trade-offs across Run, Sleep, Stop, and Standby modes. Its clock system integrates multiple internal sources (HSI16, LSI, MSI, LSE) plus external crystal support (1–25 MHz), enabling precise RTC operation and PLL-based CPU clock generation up to 32 MHz.

Analog subsystem includes a 12-bit ADC with 16-channel multiplexing, two independent comparators with window mode and wake-up capability down to 1.65 V, and calibrated temperature sensor/VREFINT. The 7-channel DMA controller supports concurrent transfers for ADC, USART, SPI, I2C, and timers without CPU intervention.

Key Specifications

Pinout & Package

STM32L051K8T7 uses the UFQFPN32 (5×5 mm) package with 32 leads, compliant with ECOPACK2 environmental standards. Pin functions are defined per STMicroelectronics datasheet DS10184 Rev 10 Section 4 (Pin descriptions) and Table 15 (STM32L051x6/8 pin definitions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051K8T7, STM32L071K8T7 offers scalable memory for future firmware expansion without board redesign, while STM32L011K4T6 reduces BOM cost where EEPROM and higher ADC channel count are unnecessary - both maintain identical low-power behavior and pin compatibility.

Availability

STM32L051K8T7 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, portable medical monitors, and industrial predictive maintenance sensors requiring stable component supply, long-term lifecycle assurance, and verified ultra-low-power performance.

Supply support for STM32L051K8T7 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 series is ST's ultra-low-power access-line MCU product line, engineered specifically for energy-constrained applications demanding extended battery life, robust peripheral integration, and industrial-grade reliability across wide temperature ranges.

FAQ

What is the maximum operating frequency and associated power consumption of the STM32L051K8T7?

The STM32L051K8T7 achieves a maximum CPU frequency of 32 MHz using its PLL or HSI16 oscillator. At this speed, typical active current is 88 µA per MHz (2.82 mA total at 32 MHz with peripherals enabled). This value is measured with code executing from Flash under 3.3 V supply and confirmed in DS10184 Rev 10 Table 25.

Does the STM32L051K8T7 support hardware encryption or secure boot features?

No. The STM32L051K8T7 does not integrate hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. Security relies on software-based implementations or external secure elements. For certified secure boot, ST recommends the STM32L5 or STM32H5 series, which include ARM TrustZone and dedicated security peripherals.

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 Rev 10 Table 48). It supports byte/word/sector erase and read-modify-write operations, making it suitable for factory-trimmed sensor offsets, user-configurable thresholds, and runtime calibration constants.

Is the UFQFPN32 package of the STM32L051K8T7 compatible with standard reflow profiles?

Yes. The UFQFPN32 package (JEDEC MS-034 variant) is qualified for standard Pb-free reflow soldering per IPC/JEDEC J-STD-020. Peak temperature is 260 °C for ≤40 seconds, with ramp-up rate ≤3 °C/s. Thermal resistance (θ_JA) is 50 °C/W (DS10184 Rev 10 Table 20), confirming suitability for automated SMT assembly without special thermal management.