STMicroelectronics STM32F401CBU7

Overview

STM32F401CBU7 from STMicroelectronics is a 32-bit Arm® Cortex®-M4 microcontroller with FPU, delivering 105 DMIPS at 84 MHz, featuring 128 KB Flash, 32 KB SRAM, and integrated USB 2.0 FS OTG controller with on-chip PHY. It supports 1×12-bit 2.4 MSPS ADC (16 channels), up to 11 communication interfaces including 3×I²C, 3×USART, and 4×SPI, and operates across -40 °C to 85 °C in UFQFPN48 package - used in industrial HMI, sensor fusion nodes, and USB-connected embedded controllers.

For engineers reviewing the STM32F401CBU7 datasheet, STM32F401CBU7 pinout, STM32F401CBU7 application, or STM32F401CBU7 equivalent, key selection criteria include Flash/SRAM size trade-offs, USB OTG FS integration vs. external PHY requirement, low-power Stop mode current (10 µA typ), and 5 V-tolerant GPIO count (up to 78 pins) for mixed-voltage system interfacing.

Technical Context

The STM32F401CBU7 implements an Arm Cortex-M4 core with hardware FPU and Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from Flash at 84 MHz. Its memory subsystem includes 128 KB of dual-bank Flash with ECC support, 32 KB SRAM, and 512 bytes of OTP memory for secure boot configuration.

Clock architecture integrates four oscillators: 4–26 MHz external crystal, 16 MHz factory-trimmed RC, 32 kHz RTC oscillator with calibration, and 32 kHz internal RC - enabling precise real-time operation and flexible low-power mode transitions (Stop/Standby with sub-µA VBAT retention).

Key Specifications

Pinout & Package

UFQFPN48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK2 certified. Pinout validated per STMicroelectronics DS9716 Rev 11, Section 4 (Pinouts and pin description).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with STM32F401CCU6, the STM32F401CBU7 trades Flash/SRAM headroom for lower unit cost and smaller code footprint; versus STM32F072CBT6, it delivers 2.2× DMIPS and integrated FPU for sensor fusion algorithms, at higher power and price.

Availability

STM32F401CBU7 is available at Aetrix Electronics and suitable for industrial HMI, USB peripheral devices, and low-power edge sensing applications requiring stable component supply, long-term lifecycle assurance, and ECOPACK2 compliance.

Supply support for STM32F401CBU7 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 management ICs, MEMS, and automotive semiconductors since 1987.

The STM32F401 line targets cost-optimized, USB-enabled Cortex-M4 applications in industrial control, consumer electronics, and IoT edge nodes - emphasizing balanced performance, low power, and integration of USB PHY and analog peripherals.

FAQ

What is the maximum operating frequency and corresponding DMIPS rating?

The STM32F401CBU7 runs at up to 84 MHz with an Arm Cortex-M4 core featuring hardware FPU and ART Accelerator™, achieving 105 DMIPS (Dhrystone 2.1). This performance level is measured with zero-wait-state Flash execution enabled, and includes DSP instruction support for efficient filtering and control math.

Does this MCU support USB device, host, and OTG functionality simultaneously?

No - the STM32F401CBU7 integrates a single USB 2.0 Full-Speed OTG controller that supports device, host, or OTG modes, but only one mode can be active at a time. Mode selection is configured at runtime via firmware; switching requires reinitialization of the USB peripheral and stack, and does not support concurrent device/host operation.

How many I/O pins are 5 V tolerant, and what is the maximum toggle speed?

All 78 general-purpose I/O pins on the STM32F401CBU7 are 5 V tolerant when configured in input, output, or alternate function modes. The maximum GPIO toggle speed is 42 MHz, verified per datasheet Section 6.3.16, enabling reliable bit-banging of protocols like 1-Wire or custom serial interfaces without external drivers.

What low-power modes are supported, and what is the lowest achievable current draw?

The STM32F401CBU7 supports Sleep, Stop (with Flash in Deep Power Down), and Standby modes. The lowest current is 10 µA typical at 25 °C in Stop mode with Flash powered down and RTC running - confirmed in DS9716 Rev 11 Table 27. VBAT supply enables RTC and backup registers at 1 µA, preserving timekeeping during main power loss.