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STMicroelectronics STM32L073RZT3 — Microcontrollers & Processors (MCU / MPU / DSP)

STM32L073RZT3 STM32L0 MCU, 32 MHz, 192 KB Flash, 64-LQFP

MPNSTM32L073RZT3
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STMicroelectronics STM32L073RZT3, STM32L0 series, 32-bit ARM Cortex-M0+ MCU, 32 MHz, 192 KB Flash, 20 KB RAM, 6 KB EEPROM, 64-LQFP, -40°C to 125°C.

$6.7300Ref. price · indicative, final on quote
STMicroelectronics STM32L073RZT3 datasheet (PDF)
Packaging64-LQFP
RoHSROHS3 Compliant
SeriesSTM32L0
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STM32L073RZT3 specifications
ParameterValue
SeriesSTM32L0
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.8V ~ 3.6V
Operating temperature-40°C ~ 125°C (TA)
Speed32MHz
PackageTray
RAM size20K x 8
Core size32-Bit Single-Core
EEPROM size6K x 8
PeripheralsBrown-out Detect/Reset, DMA, I²S, LCD, POR, PWM, WDT
ConnectivityI²C, IrDA, LINbus, SPI, UART/USART, USB
Number of i (O)51
Core processorARM® Cortex®-M0+
Case64-LQFP
Data convertersA/D 16x12b; D/A 2x12b
Program memory size192KB (192K x 8)

Product details

192 KB Flash, 20 KB RAM, 6 KB EEPROM — memory headroom for the firmware stack

Program memory is 192 KB of Flash, paired with 20 KB of SRAM and a separate 6 KB EEPROM block. The EEPROM is useful for calibration constants or configuration data that need byte-level writes without wear-leveling overhead. The 20 KB RAM supports moderate data buffering — enough for a USB CDC class or a small RTOS heap — but a design with large frame buffers or heavy audio processing will need to budget carefully.

32 MHz ARM Cortex-M0+ with 16-channel ADC and LCD drive

The core runs at 32 MHz, which is the speed ceiling for this ultra-low-power family. The integrated LCD driver (up to 8x40 segments) and the USB 2.0 full-speed interface make this a fit for metering, human-machine interface, and portable instrumentation designs.

The 64-LQFP package (10x10 mm) with 51 I/Os provides enough GPIO for parallel buses or a keypad matrix without resorting to a larger BGA.

Frequently asked questions

What is the difference between STM32L073RZT3 and STM32L073RZT6?

All other specs — 32 MHz core, 192 KB Flash, 20 KB RAM, 64-LQFP package — are identical.

Can I replace STM32L073RZT3 with STM32L072RZT3?

The STM32L072RZT3 is a lower-density sibling with 192 KB Flash and 20 KB RAM but without the 6 KB EEPROM and without the LCD driver. If your firmware relies on the EEPROM block or the LCD segment drive, the L072 will not be a drop-in replacement. Check the memory map and peripheral set before substituting.

What is the closest functional second-source for STM32L073RZT3?

The STM32L151CBU6A is a 32 MHz ARM Cortex-M3 part with similar connectivity (I²C, SPI, USART, USB) and ADC/DAC count, but it lacks the LCD driver and EEPROM block. It is a functional alternative only if those features are not needed.