It runs at 72 MHz and carries 1 MB of on-chip Flash program memory backed by 96 KB of SRAM — the highest-density option in the STM32F103 value-line.
It comes in a 100-pin LQFP with a 14x14 mm body — a standard fine-pitch QFP that runs through a typical leaded-solder reflow profile without special handling. The 80 available GPIOs give enough headroom for parallel address/data buses or a dense bank of opto-isolated digital inputs.
ST lists the STM32F103VGT6J as obsolete.
