STMicroelectronics STM32F401CBU6TR

Overview

STM32F401CBU6TR from STMicroelectronics is a 32-bit Arm® Cortex®-M4 microcontroller with FPU, delivering 105 DMIPS at 84 MHz, featuring 256 KB Flash, 64 KB SRAM, and integrated peripherals including 1×12-bit 2.4 MSPS ADC, USB OTG FS, and up to 11 communication interfaces. It targets cost-sensitive, power-aware embedded applications such as smart sensors and industrial HMI.

For engineers reviewing the STM32F401CBU6TR datasheet, STM32F401CBU6TR pinout, STM32F401CBU6TR application, or STM32F401CBU6TR equivalent, key selection criteria include Flash/SRAM size, operating voltage range (1.7–3.6 V), low-power Stop/Standby current (10 µA / 2.4 µA), 5 V-tolerant I/O count (up to 81), and UFQFPN48 package compatibility for space-constrained PCBs.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from Flash memory at 84 MHz, alongside a Memory Protection Unit (MPU) for secure task isolation. Its clock system includes dual oscillators (4–26 MHz HSE and 32 kHz LSE), internal 16 MHz RC, and dedicated audio PLL (PLLI2S) for I2S audio timing.

Power architecture supports multiple low-power modes: Stop mode with Flash in deep power-down (10 µA typ @25 °C), Standby mode (2.4 µA @25 °C, no RTC), and VBAT-supplied RTC with subsecond accuracy. All 81 GPIOs are 5 V tolerant, and up to 78 support 42 MHz toggle rates.

Key Specifications

Pinout & Package

STM32F401CBU6TR is housed in a 48-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN48) package, 7 × 7 mm body, 0.5 mm pitch, with exposed thermal pad. Pin functions conform to STM32F401xC series standard mapping per datasheet section 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F401CEU6, the CBU6TR offers sufficient memory for most sensor-edge applications at lower cost and power; versus STM32F072CBT6, it delivers significantly higher compute density and analog performance-critical for real-time sensor fusion and USB audio-class timing.

Availability

STM32F401CBU6TR is available at Aetrix Electronics and suitable for smart sensor nodes, industrial HMI panels, portable medical devices, and energy metering modules requiring stable component supply and long-term industrial lifecycle support.

Supply support for STM32F401CBU6TR 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-grade components since 1987.

The STM32F4 Series targets high-performance, energy-efficient embedded applications demanding DSP capability, rich connectivity, and real-time responsiveness-especially in industrial automation, IoT edge nodes, and human-machine interfaces.

FAQ

What is the maximum operating frequency and associated performance metric?

The STM32F401CBU6TR operates at up to 84 MHz with an Arm Cortex-M4 core featuring a Floating-Point Unit. Its performance is quantified at 105 DMIPS (Dhrystone 2.1), measured at 1.25 DMIPS/MHz. This rating reflects deterministic execution speed under zero-wait-state conditions enabled by the ART Accelerator™, making it suitable for real-time control and signal processing tasks.

Does this MCU support USB device functionality without external components?

Yes. The STM32F401CBU6TR integrates a full-speed USB 2.0 OTG controller with an on-chip PHY, supporting device, host, and OTG roles. It requires only passive components (two 1.5 kΩ pull-up resistors and decoupling capacitors) - no external transceiver or level shifters - reducing BOM cost and board area for USB-enabled designs.

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

All 81 GPIOs on the STM32F401CBU6TR are 5 V tolerant, allowing direct interfacing with 5 V logic systems while operating from a 1.7–3.6 V supply. Up to 78 of these pins support a maximum toggle rate of 42 MHz, enabling high-speed digital signal generation, PWM control, and fast serial protocol implementation without external drivers.

What low-power modes are available, and what are their typical current draws?

The MCU supports Run, Sleep, Stop, and Standby modes. In Stop mode with Flash in deep power-down, typical current is 10 µA @25 °C; in Standby mode (no RTC), it drops to 2.4 µA @25 °C. VBAT-supplied RTC consumes just 1 µA @25 °C. These values are validated per datasheet DS9716 Rev 11, Table 27–31, and enable multi-year battery operation in always-on sensor applications.