STM32L433CCT6 ST Mainstream Arm Cortex-M4 Ultra-Low-Power 32-bit MCU 256KB Flash 64KB SRAM USB DAC Comparator LQFP-48

STM32L433CCT6 Product Overview

STM32L433CCT6 is an Arm Cortex-M4 MCU at 80 MHz with FPU and ART Accelerator, LQFP-48. 256 KB Flash, 64 KB SRAM, USB 2.0 FS device (crystal-less), 12-bit ADC (10 ch), two 12-bit DACs, two comparators, LP timers, RTC, 2×USART, 1×UART, 1×LPUART, 2×SPI/I2S, 2×I2C. Up to 39 x 5 V-tolerant I/Os. 1.71–3.6 V, -40–85 °C. Retaining all the analog and USB capabilities of the L431 series while further optimizing power consumption and analog integration, the STM32L433CCT6 offers an excellent ultra-low-power platform for battery-powered IoT nodes, portable devices, and sensor applications with demanding power and performance requirements.

STM32L433CCT6 Core Features

Core: The STM32L433CCT6 features an Arm Cortex-M4 core at 80 MHz, with FPU + ART Accelerator

Memory: The STM32L433CCT6 provides 256 KB Flash and 64 KB SRAM (incl. 16 KB with HW parity)

USB: The STM32L433CCT6 integrates a USB 2.0 FS device (crystal-less)

Analog: 12-bit ADC (10 ch), 2×12-bit DACs, 2×Comparators

Connectivity: 2×USART, 1×UART, 1×LPUART, 2×SPI/I2S, 2×I2C

Timers: 1×Advanced Timer, multiple GP/LP timers, RTC

I/Os: 39 (5 V-tolerant)

Package: LQFP-48

Temperature Range: -40°C to 85°C

STM32L433CCT6 Applications

IoT Sensor Nodes: Battery-powered wireless sensors and USB data acquisition modules can leverage the STM32L433CCT6's low power and connectivity

Portable Devices: Wearables, portable medical devices, and USB peripherals benefit from the STM32L433CCT6's compact integration

Industrial Metering: Water, gas, and electricity meters are ideal applications for the STM32L433CCT6

Consumer Electronics: Remote controls, e-labels, smart cards

Energy Harvesting Applications: Self-powered sensor nodes and energy harvesting systems can rely on the STM32L433CCT6's ultra-low power consumption

STM32L433CCT6 Key Advantages

Cortex-M4 + FPU + Ultra-Low Power: The STM32L433CCT6 delivers excellent DSP and floating-point performance while maintaining extremely low power consumption

Integrated Crystal-less USB: The STM32L433CCT6 enables USB communication without an external crystal, simplifying design and saving BOM

256 KB Flash + 64 KB SRAM: The STM32L433CCT6 provides large storage for complex protocol stacks and data processing

Dual DACs + Dual Comparators: The STM32L433CCT6 offers flexible analog output and signal threshold detection without external components

LPUART Low-Power Serial Interface: Supports asynchronous communication in low-power modes, further optimizing system power consumption

39 x 5 V-tolerant I/Os in LQFP-48: The STM32L433CCT6 provides high-density connectivity with enhanced noise immunity

Full Ecosystem Compatibility: Easy development with STM32CubeIDE/HAL/LL libraries for the STM32L433CCT6

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FAQ

1. What is STM32L433CCT6?
STM32L433CCT6 is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L4 series, built around an Arm® Cortex®-M4 core with FPU and DSP instructions in an LQFP-48 package (7 mm × 7 mm). Operating at 80 MHz, the STM32L433CCT6 provides 256 KB Flash and 128 KB SRAM, along with CAN 2.0B, USB OTG FS, SAI audio interface, and high-precision analog peripherals—delivering full industrial connectivity and audio processing in a hand-solderable, compact package ideal for low-cost PCB design.

2. What are the key specifications of STM32L433CCT6?

• Core: Arm® Cortex®-M4, up to 80 MHz, 100 DMIPS with FPU and DSP

• Memory: 256 KB Flash, 128 KB SRAM

• Operating Voltage: 1.71 V to 3.6 V

• Temperature Range: -40 °C to +85 °C (industrial grade)

• I/O Count: up to 38

• Package: LQFP-48 (7 mm × 7 mm)

3. What are the advantages of the LQFP-48 package on the STM32L433CCT6, and is it easy to solder?
The LQFP-48 package of the STM32L433CCT6 features exposed leads with a 0.5 mm pitch, making it ideal for hand soldering and rework. Using a standard soldering iron with drag-soldering technique, assembly of the STM32L433CCT6 is straightforward—no hot-air station or reflow oven required. This greatly simplifies small-batch production and prototyping, offering a significant advantage over QFN variants in terms of manual assembly and visual inspection.

4. What applications is STM32L433CCT6 suitable for?
With CAN 2.0B, USB OTG, SAI, and 128 KB SRAM, the STM32L433CCT6 is widely used in industrial fieldbus nodes, motor control drives, portable medical instruments, sensor data loggers, and compact IoT terminals that need multiple communication protocols and easy hand-solderability. The LQFP-48 package lowers production and maintenance barriers while maintaining a small footprint.

5. What development tools support STM32L433CCT6?
ST provides free STM32CubeMX for graphical configuration and STM32CubeIDE as an integrated development environment for the STM32L433CCT6, along with the STM32CubeL4 firmware library. Debugging and programming are handled by ST-Link debuggers. The NUCLEO-L433RC board (LQFP-64) serves as an excellent prototyping platform—its peripheral and software compatibility allows seamless code migration to the 48-pin STM32L433CCT6 variant.

6. What is the power consumption of the STM32L433CCT6 across its low-power modes?

• Temperature Range: -40 °C to +85 °C

• Ultra-low-power modes of the STM32L433CCT6:

  • Shutdown mode: ~33 nA (5 wake-up pins)

  • Standby mode: ~125 nA (5 wake-up pins), ~430 nA with RTC

  • Stop 2 mode: ~1.2 µA, ~1.4 µA with RTC

  • Run mode: ~100 µA/MHz (LDO mode)

7. How does STM32L433CCT6 differ from STM32L433CCU6?
Both share identical core, memory (256 KB Flash, 128 KB SRAM), and peripherals (CAN, USB, SAI). The only difference is the package: the STM32L433CCT6 uses LQFP-48 with exposed pins for easy hand soldering and visual inspection, while the CCU6 uses UFQFPN-48 with bottom pads, optimized for automated SMT and saving PCB space. Choose STM32L433CCT6 for better manual handling and serviceability.

8. What key peripheral interfaces does STM32L433CCT6 offer?

• Communication: CAN 2.0B, I²C, SPI, UART/USART, USB OTG FS, SAI (I2S/PCM/PDM)

• Analog: 12-bit 5 Msps ADC, 12-bit DAC, ultra-low-power comparators

• Timers: 16-bit and 32-bit general-purpose timers, advanced motor-control timer

• Others: Quad SPI interface, SDMMC interface

9. What is the main difference between STM32L433CCT6 and STM32L432KCU6?
The STM32L433CCT6 offers 128 KB SRAM—double that of the L432—along with integrated CAN 2.0B and SAI in an LQFP-48 package. The L432KCU6 typically comes in a QFN package, has only 64 KB SRAM, and lacks CAN. If your application requires more memory, industrial bus communication, and an audio interface in a hand-solderable format, the STM32L433CCT6 is a significant upgrade.

10. How can I avoid pin conflicts between CAN, USB, and SAI on the 48-pin STM32L433CCT6?
Although CAN and USB default pins may overlap on the STM32L433CCT6, the STM32L4 series provides flexible alternate function mapping. For example, CAN TX/RX can be remapped from PA12/PA11 to PD1/PD0 or PB9/PB8, freeing up the pins required by USB. The SAI interface can also be assigned to different pin groups. Using STM32CubeMX's graphical configuration tool, you can visually check for conflicts and receive recommended alternative pin assignments for the STM32L433CCT6.