Mikroe MCU Card 15 for STM32 is a standardized add-on board for simply installing and replacing the microcontroller unit (MCU) on a development board equipped with the MCU Card socket. The Mikroe MCU Card ensures compatibility between the development board and any supported MCUs, regardless of their PIN and compatibility. MCU Cards have two 168-pin mezzanine connectors, allowing them to support even MCUs with extremely high pin count. The clever design allows very simple usage, following the well-established plug-and-play concept of the click board line.