Open Proteus right now. Press the P key. Search for "ATMEGA328P" (Arduino Uno's brain). Look at the "PCB Package" field. Notice how it knows exactly which footprint to use? That is the genius of a well-built library.
If you don't care about simulation (you just want to build the board), find a component with the same pin count and pitch . Place a generic header or a generic IC, then manually change its PCB footprint to the specific one you need. Warning: Do this only if you know exactly which pin is which. proteus library
But the true heart of Proteus isn't the fancy 3D viewer or the graph-based analysis—it’s the . What is the Proteus Library? In simple terms, the Proteus Library is your digital component warehouse. It contains every resistor, capacitor, IC, sensor, connector, and display that you can drag onto your schematic. Open Proteus right now