STM32F103X8_10 Datasheet, PDF (80/96 Pages) STMicroelectronics – Medium-density performance line ARM-based 32-bit MCU with 64 or 128 KB Flash, USB, CAN, 7 timers, 2 ADCs, 9 communication interfaces

Package characteristics
STM32F103x8, STM32F103xB
Figure 45. Recommended PCB design rules (0.80/0.75 mm pitch BGA)
Dpad
Dsm
Dpad
0.37 mm
Dsm
0.52 mm typ. (depends on solder
mask registration tolerance
Solder paste 0.37 mm aperture diameter
– Non solder mask defined pads are recommended
– 4 to 6 mils screen print
80/96
Doc ID 13587 Rev 12