STM32L433RCT3 ST Mainstream Arm Cortex-M4 Ultra-Low-Power 32-bit MCU 256KB Flash 64KB SRAM USB DAC Comparator LQFP-64

STM32L433RCT3 Product Overview

STM32L433RCT3 is an Arm Cortex-M4 MCU at 80 MHz with FPU and ART Accelerator, LQFP-64. 256 KB Flash, 64 KB SRAM, USB 2.0 FS device (crystal-less), 12-bit ADC (16 ch), two 12-bit DACs, two comparators, LP timers, RTC, 2×USART, 1×UART, 1×LPUART, 3×SPI/I2S, 3×I2C. Up to 52 x 5 V-tolerant I/Os. 1.71–3.6 V, -40–125 °C. Compared to the 48-pin STM32L433CCT6, the 64-pin package of the STM32L433RCT3 provides more I/Os and richer analog channels, and extends the operating temperature to 125°C, making it a more powerful and reliable ultra-low-power platform for battery-powered IoT nodes, portable instruments, and industrial sensors needing wide-temperature operation, richer connectivity, and USB.

STM32L433RCT3 Core Features

Core: The STM32L433RCT3 features an Arm Cortex-M4 core at 80 MHz, with FPU + ART Accelerator

Memory: The STM32L433RCT3 provides 256 KB Flash and 64 KB SRAM (incl. 16 KB with HW parity)

USB: The STM32L433RCT3 integrates a USB 2.0 FS device (crystal-less)

Analog: The STM32L433RCT3 includes a 12-bit ADC (16 ch), 2×12-bit DACs, 2×Comparators

Connectivity: 2×USART, 1×UART, 1×LPUART, 3×SPI/I2S, 3×I2C

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

I/Os: 52 (5 V-tolerant)

Package: LQFP-64

Temperature Range: -40°C to 125°C

STM32L433RCT3 Applications

Industrial IoT Nodes: The STM32L433RCT3 is perfect for wide-temperature sensors, field devices

IoT Sensor Nodes: Battery-powered wireless sensors, USB data acquisition modules benefit from the STM32L433RCT3's low power and connectivity

Portable Devices: Wearables, portable medical devices, USB peripherals can leverage the STM32L433RCT3's compact integration

Industrial Metering: Water, gas, and electricity meters are ideal applications for the STM32L433RCT3

Wide-Temperature Industrial Applications: Data acquisition and control in high-temperature environments rely on the STM32L433RCT3's reliability

STM32L433RCT3 Key Advantages

Cortex-M4 + FPU + Ultra-Low Power: The STM32L433RCT3 delivers excellent DSP and floating-point performance while maintaining extremely low power consumption

Integrated Crystal-less USB: The STM32L433RCT3 enables USB communication without an external crystal, simplifying design and saving BOM

256 KB Flash + 64 KB SRAM: The STM32L433RCT3 provides large storage for complex protocol stacks and data processing

Dual DACs + Dual Comparators + 16-ch ADC: The STM32L433RCT3 offers flexible analog output, signal threshold detection, and multi-channel acquisition

52 I/Os + LPUART + Rich SPI/I2C: The STM32L433RCT3 has strong peripheral connectivity for multi-sensor systems

-40–125°C Wide-Temperature Operation: The STM32L433RCT3 is suitable for harsh industrial and automotive environments

5 V-tolerant I/Os: Enhanced system noise immunity, simplified external level-shifting circuitry

Full Ecosystem Compatibility: Easy development with STM32CubeIDE/HAL/LL libraries for the STM32L433RCT3

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FAQ

1. What is STM32L433RCT3?
The STM32L433RCT3 is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L4 series, built around an Arm® Cortex®-M4 core with FPU and DSP in an LQFP-64 package. It runs at 80 MHz with 256 KB Flash and 128 KB SRAM, featuring CAN 2.0B, USB OTG FS, and SAI audio interface. The “3” suffix designates an extended temperature range of -40°C to +125°C, making the STM32L433RCT3 ideal for high-temperature industrial, automotive, and outdoor battery-powered equipment.

2. What are the key specifications of STM32L433RCT3?

• 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 +125 °C (extended industrial)

• I/O Count: up to 52

• Package: LQFP-64 (10 mm × 10 mm)

3. What package does STM32L433RCT3 use and is it easy to solder?
The STM32L433RCT3 comes in an LQFP-64 package measuring 10 mm × 10 mm with exposed 0.5 mm pitch leads. Drag-soldering the STM32L433RCT3 with a standard iron is straightforward—no hot-air station needed. The extended temperature range does not affect soldering, but adequate thermal design is required for high-temperature operation.

4. What is the practical benefit of the -40°C to +125°C temperature range?
This range enables the STM32L433RCT3 to operate reliably in extreme environments, such as near automotive engine compartments, outdoor industrial equipment, high-temperature sensor nodes, and battery management systems that must operate continuously in elevated temperatures. Unlike standard 85°C parts, the STM32L433RCT3 guarantees no performance degradation or thermal reset within its specified limits.

5. What applications is STM32L433RCT3 suitable for?
With CAN, USB, SAI, and 128 KB SRAM, the STM32L433RCT3 is designed for high-temperature industrial fieldbus nodes, motor drive controllers, portable medical devices, outdoor IoT gateways, and embedded systems that need communication bandwidth, data buffering, and high-temperature reliability all in a compact 64-pin package.

6. What development tools support STM32L433RCT3?
ST provides free STM32CubeMX and STM32CubeIDE for the STM32L433RCT3 with the STM32CubeL4 firmware library. Debugging and programming use ST-Link. The pin-compatible NUCLEO-L433RC board (standard temperature) offers a fast prototyping path—code can be directly migrated to the wide-temperature STM32L433RCT3 variant for final validation.

7. How does STM32L433RCT3 differ from STM32L433VCT3?
Core, memory (256 KB Flash, 128 KB SRAM), and peripherals (CAN, USB, SAI) are identical between the STM32L433RCT3 and the VCT3. The only differences are package and I/O count: STM32L433RCT3 uses an LQFP-64 with 52 I/Os, while VCT3 uses an LQFP-100 with 83 I/Os. Choose STM32L433RCT3 when fewer pins are needed and a smaller PCB footprint is preferred, with the same high-temperature capability.

8. What key peripheral interfaces does STM32L433RCT3 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 STM32L433RCT3 and STM32L432KCU6?
The STM32L433RCT3 offers 128 KB SRAM, CAN 2.0B, and an LQFP-64 package, targeting high-temperature industrial applications. The L432KCU6 has 64 KB SRAM, typically lacks CAN, and comes in smaller QFN packages. Choose STM32L433RCT3 when you need more RAM, CAN connectivity, and extended temperature range; choose L432 for extremely space-constrained designs that don't require CAN.

10. What should I consider when using STM32L433RCT3 in high-temperature environments?
The STM32L433RCT3 itself reliably operates up to 125°C ambient, but system design must ensure that surrounding components (crystal, capacitors, power ICs) are rated for the same temperature grade. Good PCB thermal management—using the exposed pad, copper pours, and thermal vias—helps dissipate heat. Reducing clock speed or using low-power modes can further lower the STM32L433RCT3's self-heating.