Just make the two mounting holes the same pad number.  You can have a
footprint with all the pads the same number if you like, then they'll
all netlist together.

Jim


Daniel Webster wrote:
> 
> Hello everyone:
> 
> I have created a footprint for a TO-3 NPN transistor. The TO-3 can as you
> may be aware has two mounting holes, in my case these two mounting holes are
> attached to the collector of the transistor. I have a pad for each mounting
> hole which I have labelled pad 3 and pad 4. Now when I create my schematic
> symbol for this part, I am supposed to use the standard NPN transistor
> symbol, which only has 3 pins (E-1,B-2,C-3). If I want to display a 4th pin
> and connect it to the collector on my symbol, I end up with an odd looking
> transistor symbol, that know one will understand or appreciate. If I hide
> pin 4, as someone suggests, then I can not hook it up to the desired net. If
> I omit pin 4 from the schematic and reload the netlist into the pcb, the
> program will attempt to disconnect pin 4 from it's net, and if I manually
> connect it I will get a DRC error. I would like the schematic and pcb to
> match with no netlist hickups. I do not see anyway around this problem,
> other than to live with the DRC error, or create an additional pin on the
> schematic symbol, neither of which seem a very elegant solution. Perhaps I
> should suggest to Protel that with their new version, they allow a single
> pin to be assigned to more than one pad. In fact it would be very useful to
> have a single pad assigned to different nets with no DRC error, in order to
> form a star point gnd. Any comments or suggests would be appreciated.
> 
> Thanks,
> Daniel Webster
> PCB Designer
> Northern Airborne Technology
> Kelowna, BC, Canada
> Email: [EMAIL PROTECTED]
> 
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-- 
Jim Muehlberg
Electrical Engineer
LO/IF Group
National Radio Astronomy Observatory
P.O. Box O
1003 Lopezville Rd.
Socorro, NM 87801
P: 505-835-7140/7195
F: 505-835-7027
http://www.aoc.nrao.edu/~jmuehlbe

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