David, The IPC-SM-782A is a later version than the current IPC-D-275, and follows newer design principles than was available at the writing of the IPC-D-275. Therefore, you should use the IPC-SM-782A as your guide. As with any written publication, new component releases will outpace the ability to keep a document updated. There are two ways for you to have the latest information. The first involves an electronic spread sheet (IPC-EM-782) that resides on your computer. You are then able to add components as you need them. The program requires that you input the component data info and it proceeds to calculate the resulting land pattern. The second method is to access the electronic calculator on the IPC WEB site (www.ipc.org). This is essentailly the same spreadsheet calculator. However, it is tied into a searchable database of components, both approved by EIA and EIAJ, as well as a user database of components not yet approved. The WEB calculator has just been added to the WEB by the IPC Designers Council. Therefore, the user database may not be very large at this time. Regards, Gary Ferrari Executive Director IPC Designers Council *************************************************************************** * 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] * ***************************************************************************