STMicroelectronics STM32L073RZT6U

Overview

STM32L073RZT6U from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 192 KB Flash, 20 KB SRAM, and 6 KB EEPROM, featuring integrated USB 2.0 (crystal-less), LCD driver (up to 4×52 segments), dual 12-bit DACs, and 12-bit ADC (1.14 Msps). It operates from 1.65–3.6 V across –40 to +125 °C and targets battery-powered IoT sensors and portable medical devices requiring long runtime and analog signal conditioning.

For engineers reviewing the STM32L073RZT6U datasheet, STM32L073RZT6U pinout, STM32L073RZT6U application, or STM32L073RZT6U equivalent, key selection criteria include ultra-low-power Stop mode current (0.43 µA), 5 µs Flash wakeup time, USB crystal-less operation, LCD segment drive capability, and dual buffered DAC support down to 1.8 V.

Technical Context

The STM32L073RZT6U implements a dual-bank Flash architecture with ECC and read-while-write capability, enabling seamless firmware updates without halting execution. Its clock system integrates factory-trimmed 16 MHz HSI, self-calibrating 48 MHz HSI48 for USB, and multiple low-power RC oscillators (LSI, MSI) supporting dynamic voltage scaling across Run, Sleep, Stop, and Standby modes.

Analog subsystem integration includes two independent ultra-low-power comparators (with window mode and wake-up capability), a temperature sensor, and a capacitive sensing controller supporting up to 24 channels - all functional down to 1.65 V supply. The 11-peripheral communication suite includes 4 USARTs (2 ISO 7816/IrDA-capable), 3 I²C (2 SMBus/PMBus), and 6 SPI interfaces.

Key Specifications

Pinout & Package

LQFP100 package (14 × 14 mm, 0.5 mm pitch), RoHS-compliant, ECOPACK2 certified, with exposed thermal pad for enhanced thermal dissipation in compact designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072RZT6, the STM32L073RZT6U adds USB and LCD - essential for connected displays - while STM32L433RCT6 trades ultra-low-power efficiency for computational headroom, making it suitable for more complex edge processing where battery life is secondary to performance.

Availability

STM32L073RZT6U is available at Aetrix Electronics and suitable for smart utility meters, portable medical sensors, industrial wireless nodes, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for STM32L073RZT6U 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 series targets ultra-low-power embedded applications demanding multi-year battery life, wide temperature operation, and high peripheral integration - optimized for IoT endpoints, wearables, and energy-harvesting systems.

FAQ

What is the maximum operating frequency and core type of the STM32L073RZT6U?

The STM32L073RZT6U features an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS per MHz. It supports dynamic voltage scaling to maintain performance across its 1.65–3.6 V supply range, with factory-trimmed 16 MHz HSI and self-calibrating 48 MHz HSI48 for USB timing accuracy.

Does the STM32L073RZT6U support crystal-less USB operation?

Yes - the STM32L073RZT6U integrates a 48 MHz HSI48 oscillator with automatic calibration using USB Start-of-Frame (SOF) tokens, eliminating the need for an external crystal. This reduces bill-of-materials cost and PCB area while maintaining ±0.25% USB timing accuracy across temperature and voltage.

How many I/O pins does the LQFP100 package provide, and what is their voltage tolerance?

The LQFP100 package offers up to 84 fast I/O pins, of which 78 are 5V-tolerant. These pins support multiple alternate functions including USB, LCD, ADC, DAC, timers, and communication interfaces (USART, SPI, I²C), enabling flexible peripheral mapping without level-shifting components.

What low-power modes are available, and what are their typical current draws?

The STM32L073RZT6U supports five low-power modes: Run (93 µA/MHz), Sleep (2.3 µA), Low-power Run (12.5 µA), Stop (0.43 µA with 16 wakeup lines), and Standby (0.29 µA with 3 wakeup pins). All modes retain RAM and register content except Standby, and Stop mode includes optional RTC + 20 KB RAM retention at 0.86 µA.