Jim:
Compare the body width dimensions (W) in Figure 2 with the land pattern width
(X) in Figure 3. You will see that the min pad width is always larger than
the body width until you get to a 1210. For the 1210 and 1812 caps they have
specified all these pad widths narrower than the component body. Since the
component pads are metalized all the way around, it doesn't make sense.
The next rev of IPC SM782 corrects this error. They have also modified the
fillet tables (Figure 4).
Following are the "new" pad widths that IPC faxed to us. All the other
figure 3 and 4 data changed also.
RLP no. Size X dim | Body width max (unchanged)
135A 1210 2.7 | 2.64
136A 1812 3.4 | 2.65
137A 1825 6.8 | 3.35 * (sure seems like a 6.8 pad width is
an overkill)
gary ...
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