[PCB_FORUM] Re: Oddball FET Footprint

  • From: "Carrow, Dennis" <dcarrow@xxxxxxxxxx>
  • To: "'icu-pcb-forum@xxxxxxxxxxxxx'" <icu-pcb-forum@xxxxxxxxxxxxx>
  • Date: Tue, 26 Jun 2012 13:53:00 +0000

Excuse my ignorance but how exactly do you "assign the shape to connect the 
pads"?  I assume you mean assign a net to the shape but I don't know how to do 
that to an existing shape.

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Moris Ruso
Sent: Tuesday, June 26, 2012 1:05 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Oddball FET Footprint

Hi ,
just wanted to reply but I see writing is not enough to describe.
Please find attached my symbol. As soon as you load the netlist assign the 
shape to connect the pads.
That's how we use it.
I hope it helps.

Best Regards,

Moris Ruso , Circuit Designer
Miga-Cad PCB Design Ltd.
Land: +972-4-959-1959
e-mail: moris@xxxxxxxxxxx<mailto:moris@xxxxxxxxxxx>
visit us at http://www.migacad.com
 P Think Green | Only print as needed.

From: Ritter, Alan<mailto:Alan.Ritter@xxxxxxxxxx>
Sent: Monday, June 25, 2012 7:14 PM
To: icu-pcb-forum@xxxxxxxxxxxxx<mailto:icu-pcb-forum@xxxxxxxxxxxxx>
Subject: [PCB_FORUM] Oddball FET Footprint

I'm working on the PCB footprint for a Siliconix (Vishay) Si7308DN FET.  
Nominally, it's an 8-pin part, but the thermal pad partially overlays pins 5-8 
(the drain connections to the FET).  The recommended layout has the 8 
individual pins plus the thermal pad.  Obviously, adding this as a ninth pad or 
a filled shape creates DRCs with pins 5-8.

Anyone have any bright ideas for how to lay this beast out to avoid DRCs and 
keep with the recommended pad configuration for the part?

Alan Ritter
Surgical Equipment Design & Development
Engineering Fellow

(636) 226-3364 (Office)
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