Adam:

150N makes sense if you think of it this way.

numbers go two places past the decimal point and "include" trailing Zeros

150N = 1.50mm, where the .50 is two places past the decimal.

My impression is 70N and 150N would be the names that best follow the 
IPC7351A Naming Standards.

Dave






At 09:15 AM 9/27/2007, you wrote:
>Adam:
>
>That's a good question, the only things I could find were:
>
>Resistors, Chip.......RESC + Body Length + Body Width X Height
>
>All dimensions are in Metric Units
>All Lead Span and Height numbers go two places past the decimal 
>point and "include" trailing Zeros
>All Lead Span and Body Sizes go two place before the decimal point 
>and "remove" leading Zeros
>All Chip Component Body Sizes are one place to each side of the decimal point
>Pitch Values are two places to the right & left of decimal point 
>with no leading Zeros but include trailing zeros
>
>If height numbers go 2 places to the right, and units are 
>millimeters, then I would think that 70N is correct, as that would 
>be .70 (2 places past the decimal point) for 0.7mm height.  However 
>the 150N does not fall into that category, if it did then you would 
>have to drop the last 0 and it would be .15mm.
>
>IPC needs to re-word this somehow.
>
>
>At 08:16 AM 9/27/2007, you wrote:
>>
>>Hi,
>>
>>I'm working on creating a new IPC-7351 compliant footprint library and I
>>have been finding some conflicting information. I have been using two
>>different footprint calculators and I discovered that the calculators name
>>the same footprints differently with regards to height. For example; a
>>capacitor with a height of 0.7mm is named "RESC4532X70N" by one calculator
>>and named "RESC4532X07N" by the other. And a capacitor with a height of
>>1.5mm would be named "RESC4532X150N" by one calculator would be named
>>"RESC4532X15N" by the other. Which one is correct? I can't seem to find it
>>in the standard.
>>
>>Thanks,
>>Adam
>>
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