Hello All,
I am new to EAD and was having trouble with assigning THT resistors footprints. The Kicad footprint list is fairly straight forward in nomenclature, but I was having trouble with knowing what different resistors have as far as dimensions. I thought others may have the same trouble. I inserted a chart I found online.
It came from this website: tech-sparks
You have to beware that a 0.5W commercial rating is the same size as a 0.25W Mil temperature rating
Thank you for that info, because I have a bunch of mil spec resistors that I scored years ago from Hughes Aircraft when they were dumping inventory. I was under the impression that mil spec was more closer tolerance and more robust.
Often resistors are the same part for commercial and military. Just the greater temperature range of military causes the power derating. Because they are specified over a smaller range, it is easier to get the very tight tolerances in commercial.
In ancient times, it was common for military to be 2% metal oxide, when commercial was often 5% carbon film. Carbon film is almost gone these days.