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STMicroelectronics STM32F446RET6
- Part No.:
- STM32F446RET6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM32F446RET6.pdf
- Description:
- IC MCU 32BIT 512KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:6,293
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Product details
Overview
STM32F446RET6 from STMicroelectronics is a 32-bit Arm® Cortex®-M4 microcontroller with FPU, operating up to 180 MHz (225 DMIPS), featuring 512 KB flash, 128+4 KB RAM, dual USB OTG (FS/HS), three 12-bit ADCs (7.2 MSPS in triple interleaved mode), and two 12-bit DACs - deployed in industrial motor control, audio processing, and USB-connected embedded gateways.
For engineers reviewing the STM32F446RET6 datasheet, STM32F446RET6 pinout, STM32F446RET6 application, or STM32F446RET6 equivalent, key selection factors include its dual USB PHY support (full-speed + high-speed with dedicated DMA), 114 GPIOs (112 5 V-tolerant), ART Accelerator™ enabling zero-wait-state execution from flash, and integrated SPDIF-Rx/SAI/CEC for consumer audio systems.
Technical Context
The STM32F446RET6 integrates an Arm Cortex-M4 core with hardware FPU and MPU, coupled with ST's Adaptive Real-time Accelerator (ART) that eliminates flash wait states at 180 MHz. Its memory subsystem includes flexible external memory controller (FMC) supporting SDRAM, NOR/NAND, and PSRAM, plus Dual QuadSPI for high-bandwidth serial flash expansion.
Peripherals are organized across multiple AHB/APB buses with nested vectored interrupt controller (NVIC) and extensive DMA routing: 17 timers (including advanced-control TIM1/TIM8), 20 communication interfaces (2× CAN 2.0B, 4× USART, 4× SPI/I2S, 2× SAI, SDIO, CEC, SPDIF-Rx), and parallel camera interface (DCMI) capable of 54 MB/s throughput.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU and MPU, 180 MHz max frequency → enables real-time DSP algorithms and floating-point math without external coprocessor. |
| Memory | 512 KB flash + 128 KB SRAM + 4 KB backup SRAM → supports complex firmware, OTA updates, and RTC-critical data retention during power loss. |
| ADC Performance | 3× 12-bit ADCs, 2.4 MSPS each, 7.2 MSPS in triple interleaved mode → meets high-speed sensor sampling for motor current/voltage monitoring. |
| USB Connectivity | Dual USB controllers: OTG_FS (on-chip PHY) + OTG_HS (dedicated DMA + ULPI/PHY) → enables simultaneous host/device roles and high-bandwidth peripheral bridging (e.g., USB-to-Ethernet or USB audio). |
| Timing & Clock | 4–26 MHz HSE crystal input, 32 kHz LSE for RTC calibration, internal 16 MHz RC (±1%) → ensures precise timekeeping and robust clock redundancy for industrial timing applications. |
| I/O Capability | Up to 114 I/Os, 112 5 V-tolerant, 90 MHz toggle rate → simplifies level-shifting design and supports fast digital interfacing with legacy peripherals. |
| Audio Interfaces | 2× SAI, SPDIF-Rx, I2S muxed on SPI, PLLI2S/PLLSAI → enables multi-channel digital audio input/output (e.g., TDM microphone arrays, HDMI-CEC sync, professional audio codecs). |
Pinout & Package
LQFP64 (10 × 10 mm) package with exposed thermal pad; 64-pin quad flat pack optimized for cost-sensitive industrial PCB layouts while maintaining signal integrity for high-speed peripherals including USB HS, DCMI, and SAI.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Core & I/O power supply rails | 1.7–3.6 V operation; separate VCAP pins require 2.2 µF ceramic capacitors for regulator stability. |
| PA0–PA15, PB0–PB15, etc. | General-purpose I/O banks | 114 total GPIOs; 112 support 5 V tolerance - allows direct connection to 5 V logic without level shifters. |
| PA11/PA12 | USB FS D+/D− | Integrated full-speed PHY - no external transceiver needed for USB device/host enumeration at 12 Mbps. |
| ULPI_D[7:0], ULPI_CLK, etc. | USB HS physical layer interface | Connects to external ULPI-compliant PHY (e.g., SMSC USB334x) for 480 Mbps high-speed operation. |
| PC6–PC9, PD3–PD7 | DCMI data bus (D0–D7) and control signals | Supports 8-/10-/12-bit parallel camera sensors up to 54 MB/s - suitable for machine vision edge preprocessing. |
| PE2–PE5, PE12–PE15 | SAI1 and SAI2 serial audio interfaces | Dual independent SAI blocks with MCLK/BCLK/WS/SD lines - enables stereo I2S + TDM audio simultaneously. |
Key Features
| Feature | Design Value |
|---|---|
| ART Accelerator™ | Enables zero-wait-state execution from flash at 180 MHz - eliminates cache misses and guarantees deterministic interrupt latency in real-time control loops. |
| Flexible Memory Controller (FMC) | Supports SRAM, PSRAM, NOR/NAND flash, and SDRAM/LPSDR - allows expansion beyond on-chip memory for GUI frame buffers or protocol stacks. |
| Dual USB OTG Controllers | OTG_FS (integrated PHY) + OTG_HS (ULPI/DMA) - enables concurrent USB device (e.g., CDC ACM) and host (e.g., USB HID keyboard/mouse) functionality. |
| Triple Interleaved ADC Mode | 7.2 MSPS aggregate sampling across three 12-bit ADCs - satisfies Class A power quality monitoring (IEC 61000-4-30) requirements. |
| Backup Domain Resources | RTC with subsecond accuracy, 20×32-bit backup registers, 4 KB backup SRAM powered by VBAT - preserves critical state during main power brownout. |
Applications
| Industrial Motor Control | USB Audio Gateway |
|---|---|
Use Scenario: Closed-loop field-oriented control (FOC) of 3-phase BLDC motors with real-time current sensing and PWM generation. IC Role / Device Role / Timing Role: Main system controller executing FOC algorithm, managing 12-bit ADC sampling (three shunt resistors), generating complementary PWM via TIM1/TIM8, and communicating over CAN 2.0B. Use Value: 180 MHz CPU + FPU + triple ADC interleaving delivers <1 µs current loop update time; 5 V-tolerant GPIOs interface directly with gate drivers and Hall sensors. | Use Scenario: USB-powered audio interface converting analog line-in to USB audio class (UAC2) output, supporting 24-bit/96 kHz playback and recording. IC Role / Device Role / Timing Role: Audio processor handling I2S/SAI input from codec, SPDIF-Rx sync, USB HS streaming, and PLLI2S clock generation for sample-rate conversion. Use Value: Dual SAI + SPDIF-Rx + USB HS with dedicated DMA enables low-jitter, multi-format audio transport without external DSP or FIFO buffers. |
| Smart Energy Metering | Embedded Vision Edge Node |
Use Scenario: DIN-rail mounted electricity meter performing harmonic analysis, tariff calculation, and secure data logging via RS-485 and NB-IoT modem. IC Role / Device Role / Timing Role: Primary MCU acquiring voltage/current waveforms via 3× ADCs, computing RMS/harmonics using CMSIS-DSP, storing logs in flash, and managing secure boot and AES encryption. Use Value: 512 KB flash accommodates dual-bank firmware + crypto libraries; RTC with VBAT backup ensures accurate billing timestamping during mains failure. | Use Scenario: Low-cost visual inspection node capturing VGA images from OV7670 camera and running lightweight CNN inference on local features. IC Role / Device Role / Timing Role: Image acquisition controller using DCMI interface, preprocessing raw frames in SRAM, and feeding feature vectors to CMSIS-NN library via Cortex-M4 FPU. Use Value: 54 MB/s DCMI bandwidth captures 640×480@30 fps; 128 KB SRAM holds full frame buffer + neural net weights for real-time classification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32F407VGT6 | Same Cortex-M4 core but no USB HS, lower ADC speed (2.4 MSPS total), no SPDIF/SAI, 1 MB flash/192 KB RAM | Lacks audio-specific peripherals and high-speed USB - unsuitable for USB audio or professional AV equipment | Select when USB HS, SAI, or SPDIF are unnecessary and larger flash/RAM are required for bootloader + application separation. |
| STM32H743VIT6 | Cortex-M7 core (480 MHz), dual-core option, 2 MB flash/1 MB RAM, enhanced security (AES/SHA/PUF), no DCMI or SPDIF-Rx | Higher performance and security, but missing DCMI and SPDIF-Rx - not drop-in for camera/audio capture use cases | Choose for AI edge inference or secure industrial gateway where camera/audio capture is secondary to compute/security. |
Compared with STM32F407VGT6, the STM32F446RET6 adds USB HS, SPDIF-Rx, and dual SAI - essential for audio-centric designs; versus STM32H743VIT6, it retains DCMI and SPDIF-Rx at lower cost and power, making it optimal for camera-audio fusion nodes.
Availability
STM32F446RET6 is available at Aetrix Electronics and suitable for industrial motor control, USB audio gateways, smart energy metering, and embedded vision edge nodes requiring stable component supply across extended product lifecycles.
Supply support for STM32F446RET6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and automotive semiconductors since 1987.
The STM32F4 series targets high-performance general-purpose embedded applications, emphasizing real-time responsiveness, rich analog/peripheral integration, and seamless connectivity - specifically engineered for industrial automation, audio processing, and USB-enabled IoT endpoints.
FAQ
What is the maximum operating temperature range for STM32F446RET6?
The STM32F446RET6 is qualified for industrial temperature range: –40 °C to +85 °C ambient. This is verified per ST's qualification standard AEC-Q100 Grade 2 (for selected variants) and supported by thermal characteristics in Section 7.8 of DS10693 Rev 11, including θJA = 44.5 °C/W for LQFP64 package.
Does STM32F446RET6 support external SDRAM, and what interface is used?
Yes, the STM32F446RET6 supports external SDRAM via its Flexible Memory Controller (FMC) with 16-bit data bus. It implements the standard SDRAM command protocol (ACTIVATE/PRECHARGE/REFRESH) and supports densities up to 256 Mbit using x16 organization, as detailed in Section 3.9 and Table 6.3.26 of the datasheet.
How many independent PWM channels can be generated simultaneously on STM32F446RET6?
The STM32F446RET6 supports up to 36 independent PWM outputs: TIM1 and TIM8 each provide 6 channels (with complementary dead-time control), and ten general-purpose 16-bit timers (TIM2–TIM5, TIM9–TIM14) offer 2–4 channels each - totaling ≥36 OC/PWM-capable pins, confirmed in Table 2 and Section 3.21 of DS10693 Rev 11.
Is the STM32F446RET6 pin-compatible with other STM32F446 variants like STM32F446VET6?
No - STM32F446RET6 (LQFP64) is not pin-compatible with STM32F446VET6 (LQFP100) or STM32F446ZET6 (LQFP144). Pin count and layout differ significantly; migration requires PCB redesign. Pin compatibility exists only within same package type (e.g., all LQFP64 variants share identical pinout per Table 10 in DS10693 Rev 11).
STM32F446RET6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- Series:
- STM32F4
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M4
- Core Size:
- 32-Bit Single-Core
- Speed:
- 180MHz
- Connectivity:
- CANbus, EBI/EMI, I2C, IrDA, LINbus, SAI, SD, SPDIF-Rx, SPI, UART/USART, USB, USB OTG
- Peripherals:
- Brown-out Detect/Reset, DMA, I2S, LVD, POR, PWM, WDT
- Number of I/O:
- 50
- Program Memory Size:
- 512KB (512K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.7V ~ 3.6V
- Data Converters:
- A/D 16x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32F446RET6 FAQ
1.How can I place an order for STM32F446RET6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32F446RET6 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM32F446RET6 reliable?
The price and inventory of STM32F446RET6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32F446RET6 is usually 5 days.
3.What payment methods are accepted for STM32F446RET6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32F446RET6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32F446RET6?
STM32F446RET6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32F446RET6 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM32F446RET6?
For technical support, including STM32F446RET6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32F446RET6 requirements.
6.How does Aetrix verify that STM32F446RET6 is sourced from the original manufacturer or authorized distributors?
All STM32F446RET6 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32F446RET6 meets industry standards.
7.What is the process for return or replacement of STM32F446RET6?
All STM32F446RET6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32F446RET6, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM32F446RET6 part is unused and in its original packaging.
Return procedure for STM32F446RET6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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