Item specifics
Description
STM32F446RCT6 is a Cortex-M4 MCU at 180 MHz, LQFP-64. 256 KB Flash, 128 KB SRAM, USB OTG HS/FS, Quad SPI, 2×SAI, SDIO, dual CAN, 3×12-bit ADCs (16 ch), 2×12-bit DACs, 17 timers (2× advanced motor control). 50 x 5 V-tolerant I/Os. 1.7–3.6 V, -40–85 °C. High-performance general-purpose MCU with advanced peripherals.
Core: Cortex-M4 180 MHz, FPU + ART Memory: 256 KB Flash, 128 KB SRAM Connectivity: USB OTG HS/FS, SDIO, Quad SPI, 2×SAI, Dual CAN 2.0B, 4×USART, 2×UART, 3×SPI/I2S, 3×I2C Analog: 3×12-bit ADCs (16 ch), 2×12-bit DACs Timers: 17 (2× motor control PWM/deadtime, 8× GP, 2× basic, 2× WDT) I/Os: 50 (5 V-tolerant) Package: LQFP-64
Motor control, industrial automation, audio interfaces, IoT nodes, high-performance embedded systems
180 MHz FPU + ART: Strong processing performance Quad SPI + SAI: Fast memory expansion and high-quality audio USB HS/FS + SDIO: Flexible data connectivity and storage Compact 64-pin with 50 I/Os
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FAQ:
What is the STM32F446RCT6 and how does it differ from the STM32F446RET6?
The STM32F446RCT6 is a 180 MHz Cortex‑M4 microcontroller with 256 KB of Flash and 128 KB of SRAM, packed in an LQFP‑64 body. It is the 256‑KB Flash variant of the STM32F446 series, while the RET6 offers 512 KB. All other features—CPU speed, SRAM size, peripherals, and pin‑out—are identical. This makes the RCT6 the natural choice when your application code fits comfortably in 256 KB and you want to avoid paying for unused Flash.
Is 256 KB of Flash enough for a real motor‑control application with a communication stack?
Absolutely. A typical motor‑control library with sensorless FOC, a real‑time OS, and a CANopen or Modbus stack often occupies less than 200 KB. The remaining space can hold custom application logic, calibration tables, and a bootloader. If your code base grows beyond 256 KB in the future, you can migrate to the pin‑compatible RET6 without any hardware change.
How should I decide between the 256‑KB RCT6 and the 512‑KB RET6 for a new design?
Start by estimating your firmware size with all middleware included. If the compiled binary is under 220–230 KB, the RCT6 gives you a comfortable margin. Choosing the RCT6 also makes sense when you are building a dedicated, fixed‑function device (e.g., a single‑axis motor drive or a USB audio interface) where the code size is unlikely to grow significantly. For feature‑rich gateways or products that will receive many over‑the‑air updates, the RET6’s extra Flash provides more headroom.
Can I still expand the memory externally on the STM32F446RCT6’s LQFP‑64 package if 256 KB is not enough?
Yes. The flexible memory controller (FMC) on the LQFP‑64 package supports external SRAM, PSRAM, and NOR Flash using a multiplexed 8‑ or 16‑bit data bus. You can store large data logs, lookup tables, or additional code externally. SDRAM is not supported on the 64‑pin package due to pin limitations. If you need external SDRAM, consider the LQFP‑100 VCT6 or a larger package.
Does the reduced Flash size affect the USB high‑speed capability or the fast ADCs?
Not at all. The STM32F446RCT6 retains the same full‑speed USB OTG (with on‑chip PHY) and the ULPI interface for an external high‑speed PHY. The three 12‑bit ADCs can still achieve up to 7.2 Msps in interleaved mode. The Flash size has no impact on the performance or availability of any peripheral.
What communication peripherals can I use simultaneously on the LQFP‑64 package?
With careful pin assignment, you can operate one CAN 2.0B, two USART/UARTs, one SPI, and one I2C concurrently, plus a few GPIOs. The pin‑count is limited, so it is best to use STM32CubeMX to verify your exact peripheral mix before finalising the schematic.
Is the STM32F446RCT6 a good upgrade from an STM32F103 or an older F4? Will my code fit?
In many cases, yes. The Cortex‑M4 core with FPU and DSP extensions delivers far more processing power, and the 128‑KB SRAM is double that of a typical STM32F103. Code compiled for the M3/M4 often becomes more compact when optimised for the M4, so a project that required 180 KB on an F103 may well fit within the 256‑KB limit of the RCT6. The LQFP‑64 package is often pin‑compatible, simplifying a hardware upgrade.
How can I perform over‑the‑air firmware updates with only 256 KB of single‑bank Flash?
A common approach is to partition the Flash into a bootloader and a single application area, using the 128‑KB SRAM to buffer the new firmware image during download and verification. If the image is small enough, you can even reserve a dedicated update area. In designs where firmware size is critical, consider using external NOR Flash via FMC to store a backup image, while the internal 256‑KB Flash holds the active application.
What development tools and libraries support the STM32F446RCT6? Can I prototype with a Discovery or Nucleo board?
All major IDEs—free STM32CubeIDE, Keil MDK, and IAR EWARM—fully support the chip. You can start prototyping with a NUCLEO‑F446RE board, which uses the pin‑compatible STM32F446RE (512‑KB Flash). Simply adjust the linker script to 256 KB when you switch to the RCT6. The STM32CubeF4 package provides HAL/LL drivers and examples for all peripherals.
What are the best applications for the STM32F446RCT6 given its 256‑KB Flash and compact LQFP‑64?
It is ideally suited for dedicated real‑time controllers: single‑axis motor drives, digital power supplies, USB audio interfaces, compact IoT sensor nodes, and portable instruments. The combination of a fast M4 core, precise ADCs, and a small, easy‑to‑solder package makes it a reliable and cost‑effective heart for products where the firmware complexity is well understood and unlikely to exceed the available Flash.