STMicroelectronics STM32L072KBU7

Overview

STM32L072KBU7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 192 KB Flash with ECC, 20 KB SRAM, 6 KB EEPROM, USB 2.0 crystal-less interface, and dual 12-bit DACs. It operates from 1.65–3.6 V across –40 to +125 °C and delivers 0.86 µA Stop mode + RTC with 20-KB RAM retention-ideal for battery-powered IoT sensor nodes and portable medical devices.

For engineers reviewing the STM32L072KBU7 datasheet, STM32L072KBU7 pinout, STM32L072KBU7 application, or STM32L072KBU7 equivalent, key selection criteria include verified ultra-low-power modes (0.29 µA Standby), USB crystal-less timing tolerance, 5V-tolerant I/O count (78 pins), and integrated true RNG with firewall protection for secure firmware updates.

Technical Context

The STM32L072KBU7 implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), supporting dynamic voltage scaling and clock frequencies up to 32 MHz. Its power architecture integrates five low-power modes-including Stop mode with RTC and 20-KB RAM retention-and uses factory-trimmed internal oscillators (HSI16 ±1%, HSI48 for USB) with automatic self-calibration.

Analog subsystem includes a 12-bit ADC (1.14 Msps, 16 channels), two buffered 12-bit DACs (operable down to 1.8 V), and two ultra-low-power comparators with window mode and wake-up capability (down to 1.65 V). The device also embeds a capacitive sensing controller supporting up to 24 channels for touchkey and rotary sensors.

Key Specifications

Pinout & Package

STM32L072KBU7 is housed in a 32-pin UFQFPN (5×5 mm, 0.5 mm pitch) package compliant with ECOPACK2 environmental standards. Pin layout supports full peripheral mapping including USB D+/D−, multiple USART/UART, SPI, I²C, ADC/DAC channels, and capacitive sensing inputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072KBU7, STM32L073RBT6 adds CAN but increases size and cost, while STM32L053R8T6 sacrifices USB, EEPROM, and memory headroom to reduce unit price-making the KBU7 optimal for compact, feature-complete, USB-enabled edge nodes.

Availability

STM32L072KBU7 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic devices requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for STM32L072KBU7 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 components for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding extended battery life, robust security, and rich analog integration-specifically optimized for energy-constrained IoT endpoints and portable medical instrumentation.

FAQ

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

The STM32L072KBU7 achieves a maximum CPU frequency of 32 MHz. At this speed, typical current consumption is 93 µA/MHz when executing code from Flash memory, translating to approximately 2.98 mA total under full load. This value assumes VDD = 3.3 V, ambient temperature of 25 °C, and all peripherals disabled except core logic.

Does the device support hardware encryption or secure boot features?

The STM32L072KBU7 includes a true random number generator (RNG) and hardware firewall protection to prevent unauthorized access to memory regions. While it lacks dedicated AES or SHA accelerators, its RNG and memory protection enable secure key derivation and firmware integrity checks. Secure boot is implemented via the pre-programmed system memory bootloader with signature verification capability.

Can the internal 48 MHz RC oscillator be used reliably for USB without an external crystal?

Yes-the HSI48 oscillator is specifically designed for crystal-less USB 2.0 Full-Speed operation. It features automatic self-calibration against the USB SOF packet, maintaining ±0.25% accuracy over voltage and temperature. This eliminates need for external 48 MHz crystal and associated capacitors, validated per USB-IF compliance testing in ST's reference designs.

How many I/O pins support 5V tolerance, and which peripherals share those pins?

78 of the 84 I/O pins on the STM32L072KBU7 are 5V tolerant. These include all GPIOs on ports A, B, C, D, E, and H-excluding NRST, BOOT0, and USB-specific pins. Shared peripherals include ADC inputs (PA0–PA7, PB0–PB1), USART TX/RX (PA2/PA3, PA9/PA10), SPI (PA4–PA7), I²C (PB6/PB7), and TSC channels (PA0–PA7, PB0–PB13).