Dear Tech Net,

I have a friend who is considering using a land pattern on a PWB that is 80% of  the  minimum part width. This means the part will be (much) wider than the pad, which will ensure that there is substantial overhang, in many cases outside the J-STD-001 limits.  I am trying to convince my friend to abide by IPC 275, but he insists that he always uses 80% of the minimum part width and has never seen a problem.   The parts in question are standard 0805, 1210 or 1206 R's and C's. The CCA should go through a standard solder paste reflow profile.

Can you help me convince my friend to follow the straight and narrow path defined by 275? What benefits could I offer to him in adhering to standard land patterns? He is a "bottom line" kind of guy (you know the type!) and is looking for a "payback" to change his mind.


Thanks in advance! 

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