trace width and spacing

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kanchana 29

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Hi,currently iam trying Lpc2148 ARM board can any one suggest me minimum trace width and spacing should be used.
 

For standard I/O pins the minimum trace width depends on the maximum current output requirements of your design, but even you selecting the smaller thickness (0,5Oz) in high temperature conditions, would result in a trace width smaller than that PCB manufacturer would be able to deal. In shorts, even you defining the trace width and spacing equal to the pinout itself, this would not become a problem at all.
 
You should check which technology is supported by your preferred PCB supplier. 150 µm minimal structure size (both trace width and spacing) is a standard these days, 125 µm is available from some manufacturers without extra costs, 100 µm usually with surcharge.

I believe that the TQFP-64 package can be well connected with 150 µm standard technology, preferably on a 4-layer board with ground plane.
 
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