0201 Land Pattern and Aperture Shape Design| 9 March, 2005
Greetings: I would like to know the common land patterns and aperture shapes that are currently in use. We are doing some research on the same. Please respond to the thread if you have a success story with you current design.
0201 Land Pattern and Aperture Shape Design| 10 March, 2005
From http://www.IPC.org ... IPC-7351 - Generic Requirements for Surface Mount Land Pattern and Design Standard The successor to the IPC-SM-782A is here! The document covers land pattern design for all types of passive and active components, including resistors, capacitors, MELFs, SSOPs, TSSOPs, QFPs, BGAs, QFNs and SONs. The standard provides many brand new features, including an intelligent land pattern naming convention, zero component rotations for CAD systems, and a set of three separate land pattern geometries for each component that allows the user to select a land pattern based on desired component density. Also includes updates to existing sections addressing land pattern guidelines for wave or reflow soldering, via location guidelines, fiducials and courtyard boundaries. IPC-7351 includes both the standard and a IPC-7351 land pattern viewer on CD-ROM. 92 Pages. Released February 2005.