STMicroelectronics STM32L011K4U3TR

Overview

STM32L011K4U3TR 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 operation down to 1.65 V. It delivers 0.95 DMIPS/MHz performance and supports 0.23 µA Standby mode with 2 wakeup pins - ideal for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L011K4U3TR datasheet, STM32L011K4U3TR pinout, STM32L011K4U3TR application, or STM32L011K4U3TR equivalent, key selection criteria include verified ultra-low-power modes (Stop/Standby current), integrated EEPROM retention, 5V-tolerant I/O count (23 pins), and UART/SPI/I²C peripheral concurrency under 1.65–3.6 V supply.

Technical Context

This MCU implements a dual-voltage domain architecture with separate analog/digital regulators, enabling dynamic voltage scaling across Run, Sleep, Low-power Run, and Stop modes. Its clock system integrates factory-trimmed 16 MHz HSI (±1%), 37 kHz LSI, 65 kHz–4.2 MHz MSI, and 32 kHz LSE for RTC calibration - all configurable via RCC registers without external components.

The device embeds a dedicated low-power timer (LPTIM) with asynchronous clock capability, two ultra-low-power comparators (operable down to 1.65 V with window mode and wake-up), and a pre-programmed USART/SPI bootloader. All peripherals-including ADC, DMA, and timers-are accessible in Stop mode with RAM retention, supporting rapid resumption from deep sleep.

Key Specifications

Pinout & Package

STM32L011K4U3TR uses the UFQFPN20 (3×3 mm, 0.5 mm pitch) package with 20 terminals. This compact, leadless package supports reflow soldering and offers thermal performance suitable for space-constrained industrial and portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011K4U3TR, STM32L031K4U3TR adds peripheral headroom without increasing power or footprint, while STM32L011F3U3TR reduces memory and removes EEPROM to lower unit cost - both maintain identical low-power behavior and 20-pin UFQFPN compatibility.

Availability

STM32L011K4U3TR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, portable medical devices, and asset tracking tags requiring stable component supply across extended product lifecycles.

Supply support for STM32L011K4U3TR 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 management ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32L0 Access line targets ultra-low-power embedded applications demanding long battery life, robust memory integrity, and minimal external components - optimized for cost-sensitive, space-constrained IoT edge nodes.

FAQ

What is the maximum operating frequency of the STM32L011K4U3TR core?

The Arm Cortex-M0+ core operates at up to 32 MHz maximum frequency, delivering 0.95 DMIPS/MHz performance. This speed is achievable across the full 1.65–3.6 V supply range and -40 to +125 °C temperature range, with dynamic voltage scaling ensuring consistent timing margins.

Does the STM32L011K4U3TR support hardware CRC calculation?

Yes, it includes a dedicated cyclic redundancy check (CRC) calculation unit compliant with IEEE 802.3, supporting 32-bit polynomial computation in hardware. This accelerates firmware image verification, communication frame checking, and data integrity validation without CPU intervention.

Can the internal 16 MHz RC oscillator be used without calibration in production systems?

Yes, the 16 MHz HSI oscillator is factory-trimmed to ±1% accuracy across voltage and temperature, eliminating the need for runtime calibration in most timing-critical applications such as UART baud generation or SPI clocking at standard rates.

How many I/O pins support analog functions like ADC or comparator inputs?

Up to 10 pins support ADC input channels (e.g., PA0–PA7, PB0–PB1), and both comparators accept inputs from multiple GPIOs including PA0, PA1, PA4, PA5, and PB0. Pin mapping is defined in the alternate function table (Section 4, Table 14 of DS).