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device with same signal legs, how?

e14 Contributor

Hi,

 

I have a part, a FET in a SOT223-5EV-VREGSOT223-5EV-VREG package, it has the three regular DSG

legs + a large drain for cooling. The drain therefor has two pads, how

can I connect them so they carry the same signal?

 

Tried the connection function in the device editor, but it won't allow

me to connect to two pins to the same signal.

 

Any ideas?

 

Thanks,

 

Arthur

 

 

Parents

  • artelse wrote on Wed, 07 July 2010 07:50

    I have a part, a FET in a SOT223-5EV-VREGSOT223-5EV-VREG package, it has the three regular DSG

     

    legs + a large drain for cooling. The drain therefor has two pads, how

     

    can I connect them so they carry the same signal?

     

    You can short the two pads together with a polygon, or make only one pad

    and simulate the other yourself and connect them, but either way you will

    get massive DRC errors.  There is no good answer for this in Eagle

    unfortunately.

    --

    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

Reply

  • artelse wrote on Wed, 07 July 2010 07:50

    I have a part, a FET in a SOT223-5EV-VREGSOT223-5EV-VREG package, it has the three regular DSG

     

    legs + a large drain for cooling. The drain therefor has two pads, how

     

    can I connect them so they carry the same signal?

     

    You can short the two pads together with a polygon, or make only one pad

    and simulate the other yourself and connect them, but either way you will

    get massive DRC errors.  There is no good answer for this in Eagle

    unfortunately.

    --

    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

Children
  • in reply to e14 Contributor

    artelse wrote

    I have a part, a FET in a SOT223-5EV-VREGSOT223-5EV-VREG package, it has the three regular DSG

    legs + a large drain for cooling. The drain therefor has two pads, how

    can I connect them so they carry the same signal?

    >

    "Olin Lathrop"  replied

    You can short the two pads together with a polygon, or make only one pad

    and simulate the other yourself and connect them, but either way you will

    get massive DRC errors.  There is no good answer for this in Eagle

    unfortunately.

     

    Not quite true

    You can add a connected polygon copper pad for the tab without DRC errors.

    For a SOT-223 package with only 3 pads.

    Add the Tab pad in the board editor using the polygon tool.

    Determine the name of the drain net and name the polygon the same.

    Route from the drain pad to the polygon outline  .

    Ratsnest to fill polygon and recalculate airwires

     

    Warren