Vishay Siliconix datasheet for the Si7121ADN, a 634 KB PDF. The Si7121ADN is a P-channel MOSFET in a small PowerPAK 1212-8 package, a type used for load switching and power-path control on notebook boards. It lists pin configuration, on-resistance, threshold voltage and maximum ratings. Technicians use it to identify the drain and gate pins on the compact footprint, check whether the switch is passing a rail when it should, and select a replacement P-channel part with comparable voltage and current limits.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @ic_mosfet_pdf_datasheets. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.