G'day folks - haven't been around for some time but still soldering on. Question for y'all.
One of my design engineers has shown me a Creative PCI audio card with a TQFP48 attached. 0.4mm pitch. Let's say the pin width is 0.2mm and the pad design has the pads at 0.2mm width also. On each of the 8 outside pads the pad is wider to the "outside" of the pin. Let's guess at 0.05mm or less.
Does anyone know the reasoning behind this? There is a very crude drawing attached to explain. I removed a few cogs from the Spirograph to do the drawing.