STMicroelectronics STM32L072KBU3TR

Overview

STM32L072KBU3TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFBGA32 (5 × 5 mm) package, featuring 128 KB Flash, 20 KB SRAM, 6 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and dual 12-bit DACs. It operates from 1.65–3.6 V across –40 to +125 °C and supports USB 2.0 crystal-less interface - used in battery-powered industrial sensors and portable medical monitors.

For engineers reviewing the STM32L072KBU3TR datasheet, STM32L072KBU3TR pinout, STM32L072KBU3TR application, or STM32L072KBU3TR equivalent, key selection criteria include standby current (0.29 µA), RTC+RAM retention in Stop mode (0.86 µA), 5 µs Flash wakeup time, and integrated LCD driver supporting up to 4×32 segments.

Technical Context

The STM32L072KBU3TR implements a single-core Arm Cortex-M0+ with MPU, running at up to 32 MHz using multiple clock sources: HSI16 (16 MHz ±1%), HSI48 (48 MHz, self-calibrated for USB), LSE (32.768 kHz RTC), and MSI (65 kHz–4.2 MHz). Its low-power architecture includes five operational modes - Run, Sleep, Low-power Run, Stop, and Standby - each with distinct peripheral availability and current profiles.

Memory subsystem integrates dual-bank Flash with read-while-write capability and ECC, 20 KB SRAM with configurable retention, and 6 KB data EEPROM also protected by ECC. Analog peripherals include two ultra-low-power comparators (1.65 V min supply), temperature sensor, and capacitive sensing controller supporting up to 24 channels.

Key Specifications

Pinout & Package

STM32L072KBU3TR uses a 32-pin Ultra-Fine Pitch Ball Grid Array (UFBGA32) package with 0.5 mm ball pitch and 5 × 5 mm body size. The package supports solder reflow per JEDEC J-STD-020 and is rated for industrial temperature range (–40 to +125 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L073KBU3TR, the L072KBU3TR omits LCD hardware but retains identical power performance and analog capability - making it optimal for non-display applications where UFBGA32 footprint and cost are critical. Versus L072RBT6, it trades pin count and interface count for smaller size and lower assembly cost.

Availability

STM32L072KBU3TR is available at Aetrix Electronics and suitable for smart utility metering, portable medical monitors, industrial wireless sensor nodes, and secure smart card readers requiring stable component supply over extended production lifecycles.

Supply support for STM32L072KBU3TR 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, MEMS, and automotive-grade components since 1987.

The STM32L0 series targets ultra-low-power embedded applications - optimized for battery longevity, rapid wake-up, and secure firmware execution in constrained environments such as wearables, meters, and IoT endpoints.

FAQ

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

The STM32L072KBU3TR runs at up to 32 MHz using its PLL or HSI16 oscillator. At 32 MHz with code executing from Flash, typical current consumption is 93 µA/MHz - approximately 2.98 mA total. This value assumes all peripherals disabled and VDD = 3.3 V, per DS10685 Rev 7 Section 6.3.4.

Does this MCU support USB device functionality without an external crystal?

Yes. The STM32L072KBU3TR integrates a factory-trimmed 48 MHz HSI48 RC oscillator with automatic calibration against the USB SOF packet, meeting USB 2.0 Full-Speed timing requirements without external crystal or capacitors - confirmed in Section 3.18.5 and Table 48 of DS10685 Rev 7.

How many I/O pins are 5V tolerant, and which ones are they?

22 I/O pins are 5V tolerant: PA0–PA15, PB0–PB11 (excluding PB12–PB15). These pins tolerate up to 5.5 V regardless of VDD level, enabling direct interfacing with legacy 5V logic or sensors - specified in Section 3.7 and Table 60 of the datasheet.

Is the 6 KB EEPROM truly erasable at byte-level, and what is its endurance?

Yes. The 6 KB data EEPROM supports byte, half-word, and word programming, with guaranteed 100,000 write/erase cycles and 20-year data retention at 55 °C - verified in Table 54 and Section 3.8 of DS10685 Rev 7. ECC ensures single-bit error correction and double-bit error detection during reads.