To: [log in to unmask] From: [log in to unmask] Subject: DESIGN of SMT Land Pattern Standards Problem: I am a beginner to surface mount design technology and in trying to determine the correct land pattern sizes for SMT components, I referred to IPC-D-275 and IPC-SM-782A, but, I am rather confused. The IPC-SM-782A subsection 8.1 pages 3 & 4 show tables of components and MMC land sizes, while IPC-D-275 section 5.3.4 shows tables & sizes which differ from IPC-SM-782A and a formula which when used to calculate the land pattern of a 1206 resistor detailed in the 'DALE' catalogue gives me yet another slightly different size. Question: Can you please tell me, a. If there is a document in existance which will give me a complete list of standard components and their land pattern sizes? or b. How I can overcome this confusion. Thanking you in advance DJH *************************************************************************** * 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] * ***************************************************************************