NSNs & Transistor Equivalents

Hi everyone,

I've noticed some sites (such as partslogistics.com) giving equivalent part numbers based on NSN (National Stock Numbers).

If two part numbers have the exact same NSN does that mean it is a equivalent, replacement, or just a related part? Does anyone know what it means if more than one manufacturer part number has the same NSN?

Also, are there any good cross reference sites for the 2Ns and 2S japanese transistors. They are hard to find. I currently use this one although there is only 40k cross references.



Many Thanks

Try this for datasheets and cross referencing:
https://www.datasheets.org.uk/
I thought NSN numbers were just part of the NATO military cataloging system. So two parts with the same NSN number should be the same or exceed the original spec on a particular part.