STMicroelectronics STM32L072CZT7

Overview

STM32L072CZT7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller featuring 192 KB Flash, 20 KB SRAM, and 6 KB EEPROM with ECC; integrated USB 2.0 (crystal-less), dual 12-bit DACs, 12-bit ADC (1.14 Msps), and ultra-low-power comparators; deployed in battery-powered IoT sensor nodes requiring long-term operation on coin-cell power.

For engineers reviewing the STM32L072CZT7 datasheet, STM32L072CZT7 pinout, STM32L072CZT7 application, or STM32L072CZT7 equivalent, key selection criteria include standby current (0.29 µA), RTC + 20-KB RAM retention in Stop mode (0.86 µA), USB crystal-less timing accuracy, 5 V-tolerant I/O count (78 pins), and embedded true RNG for secure firmware updates.

Technical Context

The STM32L072CZT7 implements a dual-bank Flash architecture with read-while-write capability and hardware ECC, enabling safe over-the-air 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 with RTC calibration-supporting precise timekeeping across temperature and voltage variation.

Low-power operation is enforced via five hierarchical modes: Run (93 µA/MHz), Sleep, Low-power Run/Sleep, Stop (0.43 µA, 16 wakeup lines), and Standby (0.29 µA, 3 wakeup pins). The MPU enforces memory protection during secure boot and runtime privilege separation between application and bootloader.

Key Specifications

Pinout & Package

LQFP48 (7×7 mm, 0.5 mm pitch) package with 42 general-purpose I/Os (78 total I/Os across full pinout), of which 78 are 5 V tolerant - supports direct interfacing with legacy 5 V peripherals without level shifters.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072CZT7, the STM32L073RZT6 offers expanded I/O and dual USB at the cost of board space, while the STM32L053R8T6 trades USB, DAC, and Flash capacity for lower unit cost-making each optimal for distinct tiers of feature complexity and bill-of-material constraints.

Availability

STM32L072CZT7 is available at Aetrix Electronics and suitable for smart utility meters, wearable health monitors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply across multi-year production cycles.

Supply support for STM32L072CZT7 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, specializing in microcontrollers, power management, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, secure firmware execution, and rich analog integration-designed specifically for energy-constrained edge devices in IoT and medical wearables.

FAQ

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

The STM32L072CZT7 operates up to 32 MHz with dynamic voltage scaling. At 32 MHz and 3.3 V, typical Run mode current is 93 µA/MHz (≈3.0 mA total), verified per DS10689 Rev 5 Table 30. This value assumes code execution from Flash with active peripherals including ADC and timers.

Does the device support hardware encryption acceleration?

No, the STM32L072CZT7 does not include dedicated AES or SHA hardware accelerators. It relies on software libraries (e.g., Mbed TLS) running on the Cortex-M0+ core, augmented by its True RNG and firewall protection for key management security.

Can the 12-bit DAC outputs drive standard op-amp circuits directly?

Yes-the two 12-bit DAC channels include integrated output buffers capable of sourcing/sinking ±5 mA at 1.8–3.6 V supply, enabling direct connection to op-amps, filters, or transducer drivers without external buffering in most low-speed analog applications.

Is the LQFP48 package RoHS-compliant and lead-free?

Yes, the STM32L072CZT7 in LQFP48 packaging meets RoHS Directive 2011/65/EU and is fully lead-free. All packages in the STM32L072xx family are certified ECOPACK2, confirming compliance with environmental standards and halogen-free material content.