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Metric & non-metric SMT sizes, watch out...

Discussion in 'Electronic Design' started by Joerg, Apr 22, 2007.

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  1. Joerg

    Joerg Guest

    Didn't happen so far but today it almost did: Found TDK inductors listed
    with their metric SMT dimensioning and nearly mistook that for classical
    SMT size. Whew...
     
  2. nospam

    nospam Guest

    Me too TDK SMT ferrite beads, and KITAGAWA are the same. What a complete
    pain in the ass. We know what an 0805 is and don't give a crap it is
    vaguely related to imperial measurements but now we have to know a 2012
    vaguely related to metric measurements is also an 0805.


    --
     
  3. Cool. I didn't know the SMT size names well, I very rarely work with
    anything SMT. That example you decribed is nice, it helps a lot. Nothing to
    complain about at all. From that I deduced that this size must be 2.0 mm
    long and 1.2(5) mm wide, or 0.08" long and 0.05" wide. So two neatly
    detailed ways to say the same thing, given that no-one's going to worry
    much about the presence or absence of the 0.05"

    Mechanical engineers find lots of reasons to mix metric and imperial, it
    solves more problems than it creates.

    So long as we know which is being specified, and so long as the actual
    number of parts sizes doesn't proliferate too much, SMT should be usable
    even to me. My problem with it has nothing to do with size, it's that no
    standard stripboard or similar solution can apply, it's never possible to
    develop a board without going the full way to finished product just to test
    an itial layout! That's a far worse problem thast worrying about number
    conversions. I keep those in my head for inch/mm scales, but I don't have
    the same convenient access to a board fabricator.
     
  4. Meant 0.05mm for that one...
     
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