Microchip has a full document on all the packages they use: This is from the Packaging specifications page off of the page at www.microchip.com. Matt Bennett Just outside of Austin, TX 30.51,-97.91 The views I express are my own, not that of my employer, a large multinational corporation that you are familiar with. On Thu, July 14, 2011 11:11 pm, Sean Breheny wrote: > Like Herbert, I almost always print out a 1:1 scale artwork of the > component side(s) of the board and physically lay unfamiliar parts on > the paper and view the alignment under magnification. Most CAD > software can do this (produce exact scale output) natively but even if > it cannot, you can always do it from the Gerber files. I find that > most printers are fairly accurate. They may be off by, say, 1 mm over > the length of an 8 inch long board, which is negligible over the scale > of a single surface mount IC. > > Sean > > > On Thu, Jul 14, 2011 at 9:17 PM, Herbert Graf wrote: >> On Thu, 2011-07-14 at 19:00 -0600, Dwayne Reid wrote: >>> This particular incident wasn't my mistake but it easily could have >>> been - I'm sorta used to a package name (eg SOIC) having a specified >>> lead pitch and I might have decided to skip my usual "check twice" >>> policy. =A0As it was, I did have a good look at the board layout before >>> it was sent out and it *NEVER* occurred to me that the PIC footprint >>> might be wrong. >> >> FWIW I sometimes go so far as to make scale models of my board and >> "unfamiliar" parts to ensure parts are what I expect them to be... >> >> that said, the days of assuming pitch are long over. A friend of mine a >> few years ago made a board that we ALL checked. Only after it came back >> did we realize that the JTAG header on the board was 2.54mm pitch, and >> the JTAG programming cable was 2mm pitch... we've had to use the flying >> lead adapter ever since. >> >> TTYL >> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .