STMicroelectronics STM32L011K4U6

Overview

STM32L011K4U6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN20 (3×3 mm) package, featuring 16 KB Flash, 2 KB SRAM, 512 B EEPROM with ECC, 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 sensor nodes and smart meters.

For engineers reviewing the STM32L011K4U6 datasheet, STM32L011K4U6 pinout, STM32L011K4U6 application, or STM32L011K4U6 equivalent, key selection criteria include standby current (0.23 µA), RTC-enabled Stop mode (0.54 µA), 5 µs Flash wakeup, 23 I/Os (5V-tolerant), and integrated voltage detector with 5 BOR thresholds.

Technical Context

The STM32L011K4U6 implements a single-core Arm Cortex-M0+ running at up to 32 MHz, supported by multiple clock sources: 16 MHz factory-trimmed HSI (±1%), 32 kHz LSE for RTC, and multispeed MSI (65 kHz–4.2 MHz). Its low-power architecture includes five operational modes-Run, Sleep, Low-power Run, Stop, and Standby-with dedicated retention domains and wake-up capability on 16 lines or 2 pins.

Peripheral interconnect uses a centralized AHB/APB matrix enabling concurrent DMA transfers (5-channel controller) to ADC, USART, SPI, I2C, and timers. Analog subsystem integrates a 12-bit ADC with hardware oversampling, two independent comparators with window mode and wake-up capability down to 1.65 V, and internal temperature sensor with calibrated reference.

Key Specifications

Pinout & Package

STM32L011K4U6 is housed in a 20-pin UFQFPN (3 × 3 mm, 0.5 mm pitch) package compliant with ECOPACK®2 environmental standards. The package supports reflow soldering and offers compact footprint for space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L031K4U6, the STM32L011K4U6 saves BOM cost and layout area by omitting USB PHY; compared with EFM32ZG222F32, it provides stronger data integrity (ECC EEPROM) and standardized debug (SW-DP), at the expense of 0.05 µA standby current.

Availability

STM32L011K4U6 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, industrial predictive maintenance, and medical wearable patches requiring stable component supply across extended product lifecycles.

Supply support for STM32L011K4U6 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 targets ultra-low-power embedded applications demanding multi-year battery life, robust data retention, and certified functional safety features - optimized for cost-sensitive, space-constrained IoT endpoints.

FAQ

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

The STM32L011K4U6 runs at up to 32 MHz with dynamic voltage scaling. At 32 MHz and 3.3 V, typical current consumption is 76 µA/MHz (≈2.43 mA total), measured with code executing from Flash and active peripherals. This value scales linearly with clock frequency and supply voltage per datasheet Table 22.

Does STM32L011K4U6 support hardware encryption or secure boot?

No. The STM32L011K4U6 does not integrate hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. Security relies on software-implemented algorithms and external secure elements. For hardware security, consider STM32L4 or STM32L5 series MCUs.

Can the internal 512 B EEPROM be used for storing calibration data across power cycles?

Yes. The 512 B data EEPROM is independently erasable and writable (100 k-cycle endurance, 20-year retention at 85 °C), with ECC protection. It supports byte/word writes and sector erase, making it suitable for storing sensor calibration coefficients, device IDs, or usage counters without external memory.

Is the UFQFPN20 package RoHS and REACH compliant?

Yes. The STM32L011K4U6 in UFQFPN20 package meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. It is also ECOPACK®2 certified, confirming halogen-free materials and lead-free terminations compatible with standard Pb-free reflow profiles.