This datasheet provides the ordering information and mechanical device characteristics of the STM32F100x4, STM32F100x6, STM32F100x8 and STM32F100xB value line microcontrollers. In the rest of the document, the STM32F100x4 and STM32F100x6 are referred to as low-density devices while the STM32F100x8 and STM32F100xB are identified as medium-density devices.