PADS Library


Creating a New Library

When you create a new library, you are actually creating a blank container for library content and adding it to the Library List. Once this new library is created, you can then fill it with library content.

  1. On the File menu, click Library.
  2. Click the Create New Lib button.
  3. In the New Library dialog box, specify the folder and library file name, and then click Save.
  4. Click Close or create a part type.

Once library is selected.

Click on "Create New Library"

Add a new folder "Custom"

Select "Custom" folder.

Give a name to your new library.

Open the library.

Give a name to the new footprint.

At this point you can create a part type.

Since I will be making a cpacitor CAP is selected from the logic family.

Click on families and select CAP.

A single PADS library consists of 4 files, each containing items of a specific type identified by the file’s extension, as follows:

Adding Items to a Library

  1. On the File menu, click Library.
  2. In the Library Manager dialog box, select a library in the Library list.
    If you select (All Libraries), the New button is unavailable.
  3. Click one of these buttons to display categories of items in the library:
    • Decals — PCB decals (component footprints)
    • Parts — Parts
    • Lines — Drafting objects
    • Logic — CAE decals (schematic symbols). Unavailable. Use PADS Logic to add schematic decals to a library.
  4. Click the New button.

Click the New button (im15).

Decals (footprints)— Opens the PCB Decal Editor with the default configuration required to create a new decal.

Parts — Opens the Part Information Dialog Box with the default configuration required to create a Part Type.

Press Parts button and select Edit for an existing part, select New if ceaing part for an existing decal (im16).

New Component design window:

Click on Add Terminal.

Click OK.

Click OK.

Enter x, y location of the pin and click OK.

Go to Setup and select Pad Stacks.

Select the desired shape of the pad.

Select the desired shape of the pad and enter.

Select the desired shape and size of the pad and enter.

Select the desired shape of the pad and enter.


You cannot add a part to a PADS Layout design, or import the part as a component of a netlist, unless a part type and a PCB decal for the part are available in your library.

  • The PCB decal represents the “footprint” of the part (including pad and drill sizes) on the board, and is required both to place the part on the board and to route the nets connecting to the part’s pins.
  • The part type represents the electrical configuration of the part, including its logic family, pins, gates and gate pins, and mapping of gate pins to the part’s pins. It also includes other information, such as part attributes and the list of PCB decals assigned to the part. When you add a part to a design, it is added as an instance of the part type.

Changing Part Properties.
Click on Parts button ans select Edit.

General — Part statistics, logic family, pin number mapping status, connector status, ECO-registered status, list of reference designator prefixes to define the set of parts to which these properties apply, define part as special purpose (connector, die part, or flip chip).

PCB Decals — List of assigned PCB Decals. You must assign a decal to the part before specifying gate information, signal pin names, and alphanumeric pin names.

Gates — Default and alternative gates, gate swapping eligibility, gate properties, gate pin-swapping eligibility.

Pins — Signal names for pins, such as power and ground pins.

Attributes — Attributes of the part.



Creation of a New Part Type

There are five different component types that require specific instructions to create the part type:



Creating a Part Type with Identical Schematic and Layout Pin Numbering

Use this procedure to create a part type that uses the same logical and physical pin numbering. The schematic-to-layout pin numbering can be either alphanumeric-to-alphanumeric or numeric-to-numeric.
Your PCB decal(s) must exist to use this procedure.

  1. On the File menu, click Library.
  2. In the Library Manager dialog box, select a library for the new part.
  3. Click the Parts button, and then click the New button.
  4. On the General tab of the Part Information dialog box, select the logic family; this sets the refdes prefix.
  5. Select the ECO Registered Part check box.
  6. On the PCB Decals tab, assign one or more decals to the part.
  7. On the Gates tab, add at least one gate. (Add multiple gates if you want to be able to swap them.)
  8. On the Pins tab, you must fill out the Pin Group and Name columns; the other columns are optional.
  9. On the Attributes tab, add attributes as necessary.
  10. Click OK.


Creating a Part Type with Different Schematic and Layout Pin Numbering