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stupid question:  What's the difference between mil and mm?

unebonnevie

Hi,

 

I see a mix of mil and mm (millimeter) units?  Isn't mil also millimeter?

 

  • No stupid questions. But sometimes you might get an ignorant anwawer image

     

    "mil" is short for 1/1000 inch, or 0.001 inches. It is an English unit.

    "mm" is mili-meter, or 0.001 meters. It is a metric unit. By convention,

    most PCB measurements are done is "mils" and typical spacing is 100 mils,

    or 0.1 inches. This is equal to 2.54 mm, 5.08 mm, or 10.16 mm spacing. This

    is equivalent to 0.1, 0.2, and 0.4 inch spacing or 100, 200, and 400 mil

    spacing

     

    IC's typicall use a 100 mil spacing, or 0.1 inch, 2.54 mm.

     

    David

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