Keith, the IPC-SM-782 land pattern design standard outlines the principles to be considered when designing a SMT land pattern. The committee provided a complete description of the process so that new components, not yet listed, can have land patterns designed in accordance with the recommended principles. In addition to the standard, the IPC released the IPC-EM-782, which is an electronic spreadsheet version of the calculations. It provides for you to input the component dimensions and their respective tolerances, a fabrication allowance, pick and place accuracy, and your choice for solder fillet sizes. Once this step is completed, you have an opportunity analyze the results and make any further changes. Once you have completed all these steps, it calculates all you land pattern dimensions, and provides a final analysis associated with the land pattern. The best part of the program, is that it follows the principles of reliable land pattern design. It also allows the designer to create a land pattern that matches his or her processes, or meets industry concensus. Regards, Gary Ferrari IPC Staff *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************