STM32L433RCT3 - 80MHz Cortex-M4 MCU | STMicroelectronics
MPN: STM32L433RCT3 ✓ ActiveSTM32L433RCT3 Overview
An ultra-low-power microcontroller is an embedded controller designed to balance processing performance, active current, and sleep-state consumption. The STM32L4 product family combines an Arm Cortex-M4 core with energy-saving modes, analog peripherals, and connectivity interfaces. This makes the STM32L433RC family suitable for compact embedded products that need more processing capability than a basic low-cost microcontroller while retaining strict energy budgets.
The STM32L433RCT3 supports operation at up to 80 MHz and includes 100 DMIPS-class processing performance according to the manufacturer datasheet. Its 256 KB Flash memory provides room for application code and firmware, while 64 KB of SRAM supports working data, protocol stacks, and peripheral buffers. Integrated USB full-speed, LCD, and external SMPS functions reduce the number of external components required in connected or display-oriented products.
The STM32L433RC family uses the Arm Cortex-M4 processor with a floating-point unit. This architecture supports efficient digital signal processing and control calculations without requiring a separate DSP. Peripheral integration includes an LCD interface, USB full-speed interface, and external SMPS option, while the ultra-low-power design is intended for applications where standby and low-power operating modes are important.
Typical uses include low-power sensor controllers, compact human-interface devices, USB-connected embedded equipment, industrial monitoring modules, and battery-operated products. The 256 KB Flash configuration is appropriate for moderate networking protocols, control firmware, user interfaces, and data acquisition functions. Developers should select external flash only when the application exceeds both the internal program-memory and SRAM budgets.
PCB implementation requires careful attention to the 64-pin LQFP land pattern, power and ground distribution, decoupling, and exposed signal routing. Follow the manufacturer pin descriptions and recommended layout guidance when assigning tracks. Firmware should use the STM32CubeMX-supported device configuration and the clock, flash, and low-power settings documented for the STM32L433RC family.
This product page consolidates the core memory, processor, package, interface, and lifecycle facts with application guidance, package considerations, and engineering selection criteria. It is designed to help engineers determine whether the STM32L433RCT3 provides the required compute density, memory, connectivity, and low-power characteristics before beginning PCB and firmware development.
Drop-in alternatives for STM32L433RCT3 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with STM32L433RCT3 (same form factor and footprint) — differing in Package.
STM32L433RCT6
✅ Drop-InContact for price
View Datasheet →STM32L433RCT6P
✅ Drop-In📋 Reference alternative (not in catalog)
STM32L433RBT6
✅ Drop-In📋 Reference alternative (not in catalog)
STM32L433RCT3 Maximum Ratings & Electrical Characteristics
| Product Type | 32-bit ultra-low-power microcontroller |
| Processor Core | Arm Cortex-M4 with floating-point unit |
| Maximum CPU Frequency | 80 MHz |
| Instruction Set | 32-bit RISC |
| Flash Memory | 256 KB |
| SRAM | 64 KB |
| Performance | 100 DMIPS |
| USB Interface | USB full-speed |
| LCD Support | LCD controller |
| External SMPS | Supported |
| Package | 64-pin LQFP, 10 mm x 10 mm |
| Mounting Type | Surface mount |
STM32L433RCT3 64-pin lqfp, 10 mm x 10 mm Pin Configuration Guide
Pin configuration for STM32L433RCT3 (64-pin lqfp, 10 mm x 10 mm package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for STM32L433RCT3.
Refer to the datasheet for full pin configuration.
Typical Applications
STM32L433RCT3 is suitable for 6 applications: USB Sensor and Data-Acquisition Controller, Low-Power Industrial Monitoring, Human-Machine Interface Controller, Battery-Operated Portable Instrument, Digital Control and Motor-System Support, Embedded UI and Connectivity Hub.
USB Sensor and Data-Acquisition Controller
The STM32L433RCT3 fits USB-connected sensing equipment because its Arm Cortex-M4 core operates at up to 80 MHz, while 256 KB of Flash and 64 KB of SRAM support acquisition logic, control code, and protocol handlers. The integrated USB full-speed interface can communicate with a host while the device processes data locally. Deploy the controller in compact environmental monitors or laboratory instruments, and verify USB clocking, bus-power behavior, and thermal performance inside the enclosure.
Low-Power Industrial Monitoring
The STM32L433RCT3 is appropriate for industrial monitoring systems that periodically sample sensors and transmit results while minimizing active energy use. Its ultra-low-power STM32L4 architecture supports low-power modes, while the 80 MHz Cortex-M4 processor provides enough performance for filtering, threshold evaluation, and local diagnostics. The 256 KB Flash capacity can accommodate firmware updates and protocol stacks. In deployed equipment, disable unused peripherals and use the manufacturer low-power current tables to estimate battery life.
Human-Machine Interface Controller
The STM32L433RCT3 suits compact human-machine interfaces because it combines an LCD controller, 80 MHz Cortex-M4 processing, 256 KB Flash, and 64 KB SRAM in one 64-pin LQFP device. Application logic can update a display, read controls, and manage system events without a separate display controller. The external SMPS capability can support low-power system designs. Select suitable display and interface components, then confirm pin assignment and operating-state current in the final product.
Battery-Operated Portable Instrument
The STM32L433RCT3 fits portable instruments where processing capability must coexist with conservative energy consumption. Its 80 MHz Cortex-M4 core handles real-time measurement, signal conditioning, and user-interface tasks, while the STM32L4 family's low-power modes help reduce consumption between active intervals. With 256 KB of Flash and 64 KB of SRAM, the device accommodates moderate embedded software without external memory. Validate battery capacity using the exact clock, regulator, sensor, and display configurations in the assembled design.
Digital Control and Motor-System Support
The STM32L433RCT3 can act as a supervisory controller in compact motor-control systems where an 80 MHz Cortex-M4 with FPU improves responsiveness for timing calculations and control-loop support. Its 256 KB Flash and 64 KB SRAM provide room for control software and diagnostics, while integrated USB can support configuration or service connectivity. Use an external power stage for motor drive functions, isolate noisy switching paths from precision timing nets, and validate control timing under worst-case bus loading.
Embedded UI and Connectivity Hub
The STM32L433RCT3 is well suited to compact embedded hubs that coordinate a display, USB peripheral, and local sensor traffic. The 80 MHz Arm Cortex-M4 core supports multitasking and protocol processing, and 64 KB of SRAM provides working memory for moderate buffering. Integrated USB full-speed and LCD interfaces reduce external component count in space-constrained products. Determine whether internal Flash is sufficient for the user interface, connectivity stack, bootloader, and planned firmware update path before releasing the design.
Engineering reference data for STM32L433RCT3 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32L433RCT6 | STM32L433RCT6P | STM32L433RBT6 |
|---|---|---|---|---|
| Package | 64-LQFP (10x10) | 64-LQFP (10x10) | 64-LQFP (10x10) | 64-LQFP (10x10) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Processor Core | Arm Cortex-M4 with FPU | Arm Cortex-M4 | Arm Cortex-M4 | Arm Cortex-M4 |
| Maximum CPU Frequency | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 128 KB |
| SRAM | 64 KB | 64 KB | 64 KB | 64 KB |
| USB Interface | USB full-speed | USB full-speed | USB full-speed | USB full-speed |
| LCD Support | LCD controller | LCD controller | LCD controller | LCD controller |
| External SMPS | Supported | Supported | Supported | Supported |
Key Differentiators
- Doubled Flash capacity versus the lower-memory family option (vs STM32L433RBT6)
- Matches the full 256 KB Flash configuration of the directly identified ordering option (vs STM32L433RCT6)
- Same 64-pin LQFP integration for compact embedded systems (vs STM32L433RBT6)
Design Notes
Create the PCB footprint from the 64-pin LQFP mechanical drawing in the manufacturer datasheet rather than relying on a generic 64-pin land pattern. Confirm body size, lead span, pitch, toe length, and recommended courtyard. Preserve the pin-1 marker orientation and place each decoupling capacitor directly beside the associated supply pin to minimize supply-loop inductance.
Separate VDD, VDDA, and VCORE supply requirements according to the STM32L433xx datasheet. Place bulk and high-frequency capacitors at the regulator output and local supply pins, and keep return-current paths continuous under every regulator configuration. Validate startup sequencing, reset release, and brownout behavior when the design uses an external SMPS or operates across a wide input-voltage range.
Route high-speed clocks and USB communications on continuous reference planes with short return paths, and keep them away from switching-regulator inductors and high-current motor traces. Use the shortest practical route from decoupling components to device supply pins. Avoid test-point stubs on sensitive clock nets, and follow the manufacturer recommendations for analog grounds when using the ADC, DAC, comparator, or touch-sensing inputs.
Do not assume that same-package STM32L433 devices are interchangeable without checking flash size, boot configuration, peripheral availability, and temperature ordering information. The STM32L433RBT6 has 128 KB Flash rather than the STM32L433RCT3's 256 KB. Compile and size the final firmware under the intended linker configuration, and review the device migration report in STM32CubeMX before releasing a substitution.
Compliance Information
No product-specific compliance declaration was identified in the manufacturer product-page or datasheet excerpts used for this record.
