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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Why do some circuit boards have square pads and circle pads?

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The square pad often denotes the 1st pin of a device.

Square pads have greater area for a given pitch & are therefore stronger, which is another reason they are sometimes used.
 
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