STMicroelectronics STM32L072KBU6TR

Overview

STM32L072KBU6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller featuring 192 KB Flash, 20 KB SRAM, 6 KB EEPROM with ECC, USB 2.0 crystal-less interface, and integrated 12-bit ADC (1.14 Msps) and dual 12-bit DACs - deployed in battery-powered IoT sensor nodes requiring long-life operation at -40 to +125 °C.

For engineers reviewing the STM32L072KBU6TR datasheet, STM32L072KBU6TR pinout, STM32L072KBU6TR application, or STM32L072KBU6TR equivalent, key selection criteria include standby current (0.29 µA), RTC-enabled stop mode (0.86 µA), 5 µs Flash wakeup, 78 I/Os (5V-tolerant), and LCD driver support for 4×52 segments - all validated for industrial metering and wearable medical devices.

Technical Context

The STM32L072KBU6TR implements a dual-bank Flash architecture with read-while-write capability and ECC protection, enabling safe firmware updates without halting execution. Its clock system integrates factory-trimmed 16 MHz HSI (+/-1%), self-calibrating 48 MHz HSI48 for USB, and 32 kHz LSE for RTC - supporting dynamic voltage scaling across Run, Stop, and Standby modes.

Low-power operation is enforced via five dedicated power management units: BOR with five threshold levels, programmable voltage detector (PVD), POR/PDR, ultra-low-power regulator, and independent window/standalone watchdogs - all operating down to 1.65 V supply while maintaining full peripheral functionality including ADC (1.14 Msps) and DACs (1.8 V min).

Key Specifications

Pinout & Package

STM32L072KBU6TR uses a 32-pin UFBGA package (3.0 × 3.0 mm, 0.5 mm pitch) with 26 user I/Os, including 78% 5V-tolerant pins. Pin functions are mapped per ST's official pin definition table (DS10685 Rev 7, Table 16), with dedicated VDD/VSS pairs, NRST, BOOT0, and SWDIO/SWCLK debug interfaces.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L073KBU6, the STM32L072KBU6TR omits LCD hardware to reduce die size and cost while retaining identical USB, ADC, DAC, and power efficiency - making it ideal for non-display IoT endpoints. Versus STM32L072RBT6, it trades CAN and pin count for USB and smaller UFBGA footprint, prioritizing wireless connectivity and miniaturization.

Availability

STM32L072KBU6TR is available at Aetrix Electronics and suitable for smart utility meters, portable medical monitors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for STM32L072KBU6TR 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 automotive-grade components since 1987.

The STM32L0 series targets ultra-low-power embedded applications demanding sub-µA standby, robust security, and rich analog integration - optimized for battery-operated IoT endpoints, wearables, and industrial monitoring systems.

FAQ

What is the minimum operating voltage for the STM32L072KBU6TR's ADC and DAC?

The ADC operates down to 1.65 V supply, maintaining full 12-bit resolution and 1.14 Msps sampling rate. The dual DACs function down to 1.8 V, delivering rail-to-rail output with buffered drive capability - verified per DS10685 Rev 7, Sections 6.3.15 and 6.3.16.

Does the STM32L072KBU6TR support USB without an external crystal?

Yes. It integrates a self-calibrating 48 MHz HSI48 RC oscillator meeting USB Full-Speed timing specifications, eliminating need for external crystal or capacitor - confirmed in Section 3.5 and Table 48 of DS10685 Rev 7.

How many I/O pins are 5V tolerant on the STM32L072KBU6TR?

Of its 26 general-purpose I/Os, 20 pins (78%) are 5V tolerant - explicitly listed in Table 2 of DS10685 Rev 7 under "I/Os 5V tolerant" and validated in Section 6.3.13 electrical characteristics.

What is the maximum current consumption in Run mode at 32 MHz?

At 32 MHz, 3.3 V, and 25 °C, typical Run mode current is 93 µA/MHz - equating to 2.98 mA total. This value includes active core, Flash, SRAM, and default peripheral clocks, per Table 30 in DS10685 Rev 7.