Free Trials

Download a free trial to find out which Altium software best suits your needs

How to Buy

Contact your local sales office to get started on improving your design environment

Downloads

Download the latest in PCB design and EDA software

  • PCB DESIGN SOFTWARE
  • Altium Designer

    Complete Environment for Schematic + Layout

  • CircuitStudio

    Entry Level, Professional PCB Design Tool

  • CircuitMaker

    Community Based PCB Design Tool

  • NEXUS

    Agile PCB Design For Teams

  • CLOUD PLATFORM
  • Altium 365

    Connecting PCB Design to the Manufacturing Floor

  • COMPONENT MANAGEMENT
  • Altium Concord Pro

    Complete Solution for Library Management

  • Octopart

    Extensive, Easy-to-Use Component Database

  • PRODUCT EXTENSIONS
  • PDN Analyzer

    Natural and Effortless Power Distribution Network Analysis

  • See All Extensions
  • EMBEDDED
  • TASKING

    World-Renowned Technology for Embedded Systems Development

  • TRAININGS
  • Live Courses

    Learn best practices with instructional training available worldwide

  • On-Demand Courses

    Gain comprehensive knowledge without leaving your home or office

  • ONLINE VIEWER
  • Altium 365 Viewer

    View & Share electronic designs in your browser

  • Altium Designer 20

    The most powerful, modern and easy-to-use PCB design tool for professional use

    ALTIUMLIVE

    Annual PCB Design Summit

    • Forum

      Where Altium users and enthusiasts can interact with each other

    • Blog

      Our blog about things that interest us and hopefully you too

    • Ideas

      Submit ideas and vote for new features you want in Altium tools

    • Bug Crunch

      Help make the software better by submitting bugs and voting on what's important

    • Wall

      A stream of events on AltiumLive you follow by participating in or subscribing to

    • Beta Program

      Information about participating in our Beta program and getting early access to Altium tools

    All Resources

    Explore the latest content from blog posts to social media and technical white papers gathered together for your convenience

    Downloads

    Take a look at what download options are available to best suit your needs

    How to Buy

    Contact your local sales office to get started improving your design environment

    • Documentation

      The documentation area is where you can find extensive, versioned information about our software online, for free.

    • Training & Events

      View the schedule and register for training events all around the world and online

    • Design Content

      Browse our vast library of free design content including components, templates and reference designs

    • Webinars

      Attend a live webinar online or get instant access to our on demand series of webinars

    • Support

      Get your questions answered with our variety of direct support and self-service options

    • Technical Papers

      Stay up to date with the latest technology and industry trends with our complete collection of technical white papers.

    • Video Library

      Quick and to-the-point video tutorials to get you started with Altium Designer

    Implementing Complex Pad Shapes into Your PCB Designs

    John Magyar
    |  March 14, 2017

     

    Abstract image of complex pad shapes in a pcb design
     
    In some instances, geometrically irregular or complex pad shapes may be required in your designs, and getting them just right can drain a significant amount of time and manual effort. Learn how to save time and energy by quickly implementing complex pad shapes into your PCB design in Altium Designer®. Read on to find out more.

    Most component package types have consistent and straightforward rectangular or round pad shapes. Creating footprints for such packages, either manually or using an automated IPC footprint generator, is a simple process. However, component packages occasionally require complex pad shapes that can result in significant manual effort as well as additional time spent to get it just right. What if there was a way to quickly implement complex pad shapes into your PCB designs to save you time and energy?

    Quickly Place Complex Pad Shapes into Your Designs

    In some instances, geometrically complex or irregular shaped pads may be required in your designs. For example, LED lighting components can require uniquely shaped heat dissipating pads that include multiple inverse curves. Such curves are impossible to implement by combining multiple standard round/rectangular pads or by manually placing fills or solid regions. However, an often overlooked method exists whereby if the outline of the required shape can be placed (or imported) as a series of tracks and arcs forming a closed outline, then the outline itself can be easily converted within the PCB Editor to a precisely-shaped solid region defining the pad. Furthermore, solder and paste mask can be automatically controlled by DRC rules through a property setting of the region object. To better understand this method, the entire process can be explored by creating a footprint for a Bourns SRR5028 series shielded SMD power inductor as described below. To get started, a datasheet for this example from the manufacturer’s website can be found here for part number SRR5028-101Y. Each pad of this two-pin device includes an inverse curve with a 2.2 mm radius. Now let’s explore how to define pad shape outlines using the example provided in the datasheet.

    Defining Pad Shape Outlines

    In the recommended layout section of the SRR5028 series datasheet, the key dimensions of the component pads are illustrated relative to the component origin. Within the PCB Editor, six lines and one arc are placed on a mechanical layer to capture these critical dimensions of each pad relative to the component’s origin (see Figure 1). The precise size and placement of these lines and arcs are then verified to be exactly in accordance with the manufacturer's dimensions as shown in the datasheet. Setting the snap grid to 0.05 mm within the PCB Editor ensures the manufacturer's dimensions can be precisely replicated.

    1_DATASHEET.png        2_MECHANICAL.png

    Creation of Mechanical Outlines (Right) from Manufacturer’s Datasheet (Left).

    Now that the critical dimensions of the component pads have been placed and verified, any extraneous lines or arc segments can be sliced, resized or removed altogether so that the end result is just two closed outlines on a mechanical layer, where each represents a pad shape. In this example, the closed outlines were manually created and verified. Alternatively, you can import complex pad shape outlines from DXF/DWG format if such data happen to exist and are more practical to use.

    Easily Create or Import Complex Pad Shapes in Altium

    Occasionally, some components will require complex or irregular shaped pads as per manufacturer’s recommended layout. Always remember that an easy and efficient solution exists to implement complex pad shapes quickly. By creating or importing a precise outline of the complex pad shape using tracks and arcs, the result can be converted to a solid region object.

    Interested in learning more about the available methods for quickly implementing complex pad shapes in Altium ? Download a free white paper Implementing Complex Pad Shapes today.

    About Author

    About Author

    With an emphasis on microprocessor systems design, John earned his Bachelor of Science degree from SUNY Polytechnic Institute. He initially worked as a design engineer in the Defense industry developing diagnostic test programs for complex PCBs. Subsequently, John has worked as a senior application engineer in the EDA industry supporting a wide range of ASIC, FPGA, and PCB design and verification solutions.

    most recent articles

    Back to Home