STMicroelectronics STM32L073RBH6

Overview

STM32L073RBH6 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), LCD controller (up to 4×52 segments), and operates from 1.65 V to 3.6 V across –40 °C to +125 °C - deployed in battery-powered industrial sensors and portable medical devices.

For engineers reviewing the STM32L073RBH6 datasheet, STM32L073RBH6 pinout, STM32L073RBH6 application, or STM32L073RBH6 equivalent, key selection considerations include standby current (0.29 µA), RTC-enabled Stop mode (0.86 µA), 5 µs Flash wakeup, USB crystal-less operation, and 78 I/Os with 5V tolerance - critical for energy-constrained embedded designs requiring mixed-signal integration and long-term firmware retention.

Technical Context

The STM32L073RBH6 implements a dual-bank Flash architecture with read-while-write capability and hardware ECC, enabling safe over-the-air updates. Its clock system integrates factory-trimmed 16 MHz HSI, self-calibrating 48 MHz HSI48 for USB, and 32 kHz LSE for RTC - supporting dynamic voltage scaling and multiple low-power modes without external timing components.

Peripheral interconnect uses an AHB/APB matrix with DMA routing to 11 communication interfaces (including USB, 4× USART, 3× I2C, 6× SPI) and analog subsystems (dual DACs with buffers, two ultra-low-power comparators, TSC for 24 capacitive sensing channels), all accessible under sub-1 µA Stop mode with selective peripheral retention.

Key Specifications

Pinout & Package

STM32L073RBH6 is housed in a 64-pin LQFP package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant and ECOPACK2-certified. Pin functions are validated per ST's DS10685 Rev 7 (Section 4, Table 16) and support full peripheral remapping via alternate function registers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L073RBH6, the STM32L072RBH6 removes USB/LCD to reduce cost and complexity in headless nodes, while the STM32L432KCU6 trades ultra-low-power efficiency for enhanced compute and security features - making each optimal for distinct design priorities: minimal power vs. minimal BOM vs. maximal processing.

Availability

STM32L073RBH6 is available at Aetrix Electronics and suitable for smart utility meters, portable medical diagnostics, industrial wireless sensor nodes, and smart thermostat displays requiring stable component supply across extended product lifecycles.

Supply support for STM32L073RBH6 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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog chips for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust firmware integrity, and integrated analog/mixed-signal functionality - optimized for metering, wearable health, and environmental monitoring.

FAQ

What is the maximum operating temperature for STM32L073RBH6?

The STM32L073RBH6 is rated for operation from –40 °C to +125 °C, verified per DS10685 Rev 7 Section 6.3.1. This extended range supports deployment in harsh environments such as HVAC systems, industrial motor controls, and automotive under-hood modules - enabled by ST's proprietary low-leakage process and thermal-aware packaging.

Does STM32L073RBH6 support USB without an external crystal?

Yes - it integrates a self-calibrating 48 MHz HSI48 RC oscillator with hardware trimming logic, enabling full-speed USB 2.0 operation without an external crystal or oscillator. This is confirmed in Section 3.18.5 and electrical characteristics Table 48 of DS10685 Rev 7, reducing BOM count and layout complexity for portable USB devices.

How much EEPROM is available, and is it wear-levelled?

The device includes 6 KB of on-chip data EEPROM with built-in ECC and hardware write-protection per sector. While ST does not implement firmware-level wear leveling, the EEPROM endurance is rated for 100,000 write/erase cycles (Table 54, DS10685 Rev 7), and its ECC ensures data integrity across all operations - sufficient for parameter storage in most industrial and medical applications.

Can the LCD controller drive graphic displays?

No - the integrated LCD controller supports only static and multiplexed segment-type displays (up to 4×52 or 8×48 segments), not pixel-addressable graphic LCDs or OLEDs. It includes contrast control, blinking, and on-chip step-up conversion for VLCD, as specified in Section 3.11 and electrical characteristics Table 21 of DS10685 Rev 7.