Footprint Validation Service

Quality Assurance for PCB Footprints

In PCB design, the footprint is the copper geometries wherein the component is soldered to the board. If this is even slightly off, the part may not fit, leading to costly scrap or assembly delays. At Nine Dot Connects, when creating a new footprint, we will use the comprehensive method described below. However, when reviewing existing components, we also offer a Streamlined method.

The Streamlined Method

In this method, we verify the footprint based on the alignment of the component 3D model to the copper pads.

While this significantly reduces footprint creation time, it is a calculated risk. It assumes the 3D Body is accurate and thus may miss subtle errors.

Additionally, we check that labels and "Pin 1" markers on the Silkscreen layer are clear and do not interfere with the soldering areas.

The Comprehensive Method

In addition to the services provided in the Streamlined Method, this method checks each footprint, comparing its dimensions and characteristics with the manufacturer's technical specifications (i.e., datasheet or accompanying land pattern recommendations). In addition, we review:

• The solder mask, which prevents solder from "bridging" between pings during manufacturing.
  

• The solder paste, particularly for parts that reach high temperatures, ensuring they follow manufacturer's recommendations. This ensures the parts sits flat and does not "float" or tilt during the high-heat soldering process.
  

• The mechanical layers including:
  

                     - Removal of extraneous mechanical layers that are not called out in the company's style
                       guide. Extraneous layers enabled in the footprints are also enabled in the design and
                       cannot be removed.

                     - Creation and/or relocation of layers to match company's style guide. Consistency in the
                       footprints ensures rapid creation of documentation in Altium's Draftsman too.

                     - Assembly outlines are checked and positioned based on the company's style guide. This
                       assists with the rapid creation of documentation.

                     - Courtyard outline are checked to ensure they are properly placed around the 3D body.
                       Courtyards ensure that appropriate space is given between components and the PCB.

Though more time consuming, this method ensures the highest level of reliability.

Here are a few examples of how a clean library should look:

Clean Library Examples

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