You could edit the sch library symbol and put pins 3 and 4 on top of the
collector pin.
It will show up in the schematic only as a junction when you wire to the
collector pin.

Regards,

Tom.

> -----Original Message-----
> From: Daniel Webster [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, 23 October 2001 10:01 AM
> To: Protel EDA Forum
> Subject: [PEDA] TO-3 footprint question
> 
> 
> 
> 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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