Once components are created for a PCB, they are typically compiled into a library. Learn more about using a PCB component creation wizardĪ component includes these important elements: a schematic symbol, PCB footprint, and 3D model.Learn more about schematic symbol creation.MCAD tools can be used for enclosure design, checking mechanical interferences, and creating a board shape for the PCB layout. While this is not required to have a PCB manufactured, modern designs often require some level of mechanical checking and visualization in 3D. The last important piece of information needed for a PCB component is a 3D model. The table below summarizes the data that needs to be placed in schematic symbols and PCB footprints so that a component can be accurately reflected in your schematics and PCB layout. The footprint for this DIP component shows the component outline on the silkscreen layer and the holes used to mount the component. The data you include in your PCB footprint needs to accurately reflect the pad and package information in your component datasheets. The information in a PCB footprint will later be used to create Gerbers and assembly data for your PCB layout. The PCB footprint, on the other hand, includes the physical data needed to show the component in a 2D drawing. Schematic symbols do not contain any of the physical information in a design, only the electrical connections that need to be reflected in a PCB. Schematic symbols are used in front-end engineering to define connectivity in your schematics, and this will define the corresponding nets in your PCB layout. The two basic pieces of any component are a schematic symbol and a PCB footprint.
PCB design software comes with utilities to create the basic pieces of any electronic component so that it can be included in your PCB layout.
In this case, you’ll need to create these CAD data by hand. Unfortunately, even if you find the perfect part for your board, it might not come with an attached symbol or footprint. You’ll also need technical data for your components so you can create CAD models, simulations, and enclosure designs as needed. Any components you select for your board should be sourceable, meaning they are in-stock and can be procured from authorized sources.
Component selection is all part of the front-end engineering process, and it relies on having access to the right set of supply chain data and electrical specifications for your components.
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