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

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