36 MHz Cortex-M3 with 128 KB Flash — what you get
The STM32F101TBU6: 26 GPIOs with DMA, PWM, and a 10-channel 12-bit ADC.
Package and footprint — 36-VFQFPN with exposed pad
The 36-VFQFPN (6x6 mm) package has an exposed pad underneath — that pad is the main thermal path and a ground connection. The 26 I/O come out on a 0.5 mm pitch, so a two-layer board is workable if you route carefully.
ST lists the STM32F101TBU6 as Active.
