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How do I import schematic symbols into Altium?

Published in Altium Designer 3 mins read

To import schematic symbols into Altium, you'll generally use a scripting or library import process. Here's a step-by-step guide using a script example and then a general explanation for library components:

Using a Script (Example using a UL_Import.PrjScr script)

This method is useful if you have a specific script designed for importing, like a UL (component from Ultra Librarian) import script.

  1. Open Altium Designer: Launch your Altium Designer application.

  2. Run the Script: Go to File > Run Script from the Altium menu.

  3. Browse for the Script: In the "Choose Script Document to Execute" dialog, select Browse From File… and navigate to the UL_Import.PrjScr file (or whatever the script file is named).

  4. Open and Confirm: Select Open and then OK.

  5. Open the Data File: In the UL Import dialog box that appears, select File > Open. Find and select the .txt file containing the component data and click Open. (The extension could vary, but .txt is given in the example).

  6. Start the Import: Select Start Import. The script will then process the data and attempt to create or update the schematic symbol. Follow any on-screen prompts.

General Method for Importing Schematic Library Components

If you're importing components that are already in a library format (like a .SchLib or .IntLib file):

  1. Open or Create a Project: Open an existing Altium project or create a new one (File > New > Project).

  2. Add the Library to Your Project: There are a few ways to add a library:

    • Globally: This makes the library available in all Altium projects. Go to View > System > Explorer. In the Explorer panel, navigate to Libraries and right-click, then select Install. Browse to the .SchLib or .IntLib file and select Open.

    • Project-Specific: This makes the library available only to the current project.

      • In the "Projects" panel (usually on the left), right-click on your project name.
      • Select Add Existing to Project....
      • Browse to the .SchLib file and select Open.

  3. Access the Components: Once the library is added, you can access the components from it through the "Components" panel: View > Panels > Components. Select the desired library in the dropdown menu to see the available schematic symbols. You can then drag and drop the components onto your schematic sheet.

Important Considerations:

  • Library Format: Ensure the schematic symbol you are importing is in a compatible format (e.g., .SchLib, .IntLib, or a supported scripting format).
  • Script Compatibility: If using a script, make sure it's designed for your Altium Designer version. Outdated scripts may not work correctly.
  • Component Pin Mapping: Double-check the pin mapping and component footprint association after importing to ensure accuracy. Incorrect pin mappings can lead to design errors.
  • Component Parameters: Verify that the component parameters (manufacturer, part number, etc.) are imported correctly. You might need to edit them manually if the import process doesn't handle them perfectly.
  • Datasheet Verification: Always cross-reference the imported symbol with the component datasheet to confirm accuracy. This is a critical step to avoid errors in your design.

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