What the 84 MHz Cortex-M4 buys you in a control loop
The STM32F401VDT6TR is an STMicroelectronics STM32F4-series microcontroller built around an ARM Cortex-M4 core with single-precision FPU, clocked at 84 MHz. That clock rate is the sweet spot for motor-control FOC loops running at 20–40 kHz PWM update rates or for sensor fusion algorithms that need a MAC per cycle without pushing into the 100+ MHz power tier. The 384 KB Flash and 96 KB SRAM give you room for a real-time OS kernel, a moderate-sized application stack, and a few hundred floating-point coefficients without external memory.
I/O count and peripheral set for a BOM-fit check
With 81 I/Os brought out to a 100-LQFP package (14x14 mm), this part can handle a parallel LCD data bus, a bank of opto-isolated inputs, and a handful of serial peripherals simultaneously.
If your application needs AEC-Q100 qualification or 125°C operation, this is not the right STM32F4 variant — look at the STM32F42x or STM32F43x automotive-grade parts instead.
STMicroelectronics lists the STM32F401VDT6TR as Active, so there is no imminent end-of-life or last-time-buy pressure. For dual-sourcing resilience, the STM32F401 family includes pin-compatible density variants (e.g., 256 KB or 512 KB Flash) that share the same 100-LQFP footprint — a useful backup if the 384 KB version tightens.