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I'm trying to understand what are the real dimensions of the following diode:

http://www.sycelectronica.com.ar/semiconductores/1N4007-SMD.pdf

For simplicity, here is a screenshot of the relevant part from the PDF:

1N4007-SMD dimensions, taken from the PDF

By looking at the dimensions, one can notice that there is a pair of values for each dimension. For example, the first horizontal length is 4.597 / 3.988.

What is the meaning of those numbers?

Thanks!

Ian Liu Rodrigues
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  • Related, but not exactly a duplicate: [do-i-need-to-worry-about-min-max-footprint-length-values-in-datasheets](https://electronics.stackexchange.com/questions/25005/do-i-need-to-worry-about-min-max-footprint-length-values-in-datasheets/25025) – brhans Oct 08 '20 at 22:43
  • Do you know what tolerance implies? Mfg variances and design changes but non-metric originally – Tony Stewart EE75 Oct 08 '20 at 23:16

2 Answers2

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They are maximum and minimum limits.

The Photon
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The numbers represent the maximum and minimum dimensions. The somewhat silly number of digits indicates that they were converted from hard Imperialist measurements.

For example 4.597 max to 3.988 min (mm) was originally 181 to 157 thousandths of an inch.

Spehro Pefhany
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