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Where are standard component sizes defined?
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alan.green@gmail.com:
I've had reason to be working a couple of land patterns that are suitable for multiple component sizes, and I got to wondering... which organisation is it that defined the standard component sizes?
For example, most manufacturers are pretty much in agreement about what "SOT23" means. Did some industry group define that? Or is it a standard that emerged as multiple manufacturers reused the package size?
Although I can find some helpful documentation for designing land patterns that will work with a variety of packages, I can't find a reference to an original specification for any given package size.
The closest I have come is JEDEC, but that seems to be a more recent effort to document what exists rather than the original definition, and they have completely new names for surface mount parts compared to what I find at say, Digikey or Element14.
Is anyone able to shed some light on this topic? All pointers welcome.
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