In the previous tutorial, we learned how to create SMD pads for the 0603 footprint in How to Create SMD Pads in Cadence Allegro. In this tutorial, we will continue by demonstrating the process of creating a footprint, using the 0603 footprint as an example. The footprint specifications are shown in the figure below:

Creating an SMD Footprint

Let’s take the GRM033Z71C104KE14D component from Murata Electronics as an example.

Step 1: Open PCB Editor and select Allegro PCB Librarian XL.

Step 2: In the menu bar, click “File” > “New”, as shown in the figure below:

A new window will appear. Enter the footprint name (C0603 in this example) in the “Drawing Name” field and select “Package Symbol” in the “Drawing Type” option.

Click “Browse” to choose the storage path, then click “OK” to finalize the settings.

Step 3: In the menu bar, go to “Setup” > “Design Parameter”, as shown in the figure below:

In the Design Parameter Editor window, set the User units to Millimeters, then click “OK”, as shown below.

Step 4: In the menu bar, go to “Setup” > “Grid”, as shown below:

Modify the default grid of 2.54mm to 0.1mm.

Step 5: In the menu bar, go to “Setup” > “User References”, as shown below:

In the User References Editor window, click “Paths” > “Library” under Categories on the left. Then, click the “…” button next to “padpath” on the right.

Set the path to the location where the pads will be saved. After configuring, click “Apply” and then “OK” to close the window.

Step 6: In the menu bar, go to “Layout” > “Pins”, as shown below:

Add a pad using the Options sidebar, as shown in the figure below:

Note: If the corresponding pad cannot be found when adding pads, ensure that a pad file exists in the padpath.

Step 7: Place the pad by entering the coordinates (“x -0.725 0”) in the command bar and pressing Enter. Right-click and select “Done”.

The image above shows placing pin 1, while the image below demonstrates placing pin 2. Enter the coordinates (“x 0.725 0”) and press Enter. Right-click and select “Done”.