The exact pad size determination will also depend on the type of component and the mounting style. There are several ways to approach pad size determination for SMD components. If you have a component and you don't have access to the footprint, and you decide to biuld the footprint yourself, what resources are available to ensure you have the correct pad size? Calculating SMD Pad Sizes The designer is responsible for ensuring pad sizes are correct, either by calculating them and comparing with footprint data, looking through datasheets, or by memorizing SMD pad size standards. PCB designers still have to create many of their footprints using information from data sheets along with general pad and land size formulas. SMD components require precisely sized pads for soldering during assembly.
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