The insulator is good to keep the metal can from contacting adjacent pcb traces. Murphy's Law says that +5V and GND will always run near the oscillator pins! :^) Jim ----- Original Message ----- From: "Peter L. Peres" To: Sent: Monday, November 10, 2003 10:45 AM Subject: Re: [EE:] eagle on-sided solder pad > >Many crystal manufacturers make a special nylon insulator to provide a > >space between the crystal and pcb. > > I seem to remember that all metal can parts with pins require an insulator > pad between them and the board. I do not remember why. I think it has to > do with thermal expansion of the board (thickness-wise) that would slowly > work the part out of the solder if directly flush mounted. > > Peter > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.