128 KB Flash — firmware-fit decision
The STM32F103VBH6: 128 KB Flash is the mid-density option in the STM32F103 line. It holds a CANopen stack, USB HID or CDC class, and a motor-control loop, but leaves no room for over-the-air update staging.
20 KB SRAM — watch the stack and buffers
20 KB of SRAM is adequate for a single control loop with moderate data logging, but it fills fast when you enable USB buffers, a TCP/IP stack, or multiple DMA channels. Budget the RAM early in the design phase — the 20 KB is shared across all peripherals and the Cortex-M3 stack.
100-ball LFBGA — board assembly note
The 100-LFBGA package requires X-ray inspection for solder-joint verification and a controlled reflow profile. Store the trays in a dry cabinet — BGA packages are moisture-sensitive and need baking if the seal is broken.
Peripheral set — motor control and fieldbus ready
The built-in motor control PWM timers, DMA controller, and CAN interface make this part a fit for a servo drive or VFD auxiliary controller. The USB full-speed device interface handles firmware updates without a separate UART-to-USB bridge.
Lifecycle and sourcing — EOL notice in effect
The STM32F103VBH6 carries an end-of-life (EOL) status.