The SI4450DY, SI4450, SI-4450,4 450 is a 60V 7.5A 2.5W This N-Channel MOSFET is produced using Fairchild Semiconductor's advanced Power Trench process that has been especially tailored to minimize on-state resistance & yet maintain superior switching
The Micro SD TF Card Module is SPI interface via file system driver, microcontroller system to complete the MicroSD card reading and writing functions.