Hello All,
I've struggled over the years to determine the required area for my board
designs. Typically, I add up the area required for all the land patterns
and multiply the area by a scaling factor. I adjust the scaling factor
based on the details of the design. The scaling is adjusted by my gut feeling.
Currently, I have a mixed package (through-hole and SMT) with 549 parts. I
need to keep both assembly and materials costs down. That means 4 layers
or less and all components on a single side. There's a number of traces
that will need to be fairly wide (.05in) and an area where I'll have to
pour large sections of copper. There are a number of connectors. Land
Pattern Area = 44.5 sq. in.
Here are my guesses:
2-layer
Difficult = 115 sq. in.
Medium = 125 sq. in.
Easy= 135 sq. in.
4-Layer
Difficult = 105 sq. in.
Medium = 115 sq. in.
Easy= 125 sq. in.
Is this reasonable? Any other ideas?
Thanks,
Steve
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