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Connecting multiple pins to one pad SO8 M OSFET

autodeskguest

Hi;

 

Looking for some help on getting the multiple Drain and Source pads of a

N-Channel MOSFET to connect. All of these pins should be connected on the

board to allow for the 1A capability. This device is a DMS3016SSS in SO8

form factor. The device is N-MOSFET-So8S from transistor-power.lbr. I'ts

not an exact match for the chip but close enough.

 

Pins 1 to 3 are Source. Pins 5 to 8 are all Drain pins.  Pin 4 is the Gate.

In the schematic the Gate pin connects properly however only only of the

Source pins connects (Pin 1) and only one of the Drain pins connect (Pin

5). They can't all be seen but the required drain and source pins are

present in the symbol (laid on top of each other). All the Drain and Source

pins have a PAS function applied. I've managed to get the Drain pins (5-8)

all on the same pad using a simple rectangle and approving the overlap

warning generated by the rule check however the Source pins won't accept

this. I've tried using a polygon named the same as the net on Pin 1 as well

as a simple rectangle to get these pins to connect on the board but it's

not working out. The Source pins will not agree to be on the same pad. The

MOSFET is being used in an unusual application and the Source pins in this

design all all connected to ground. The board has a ground polygon around

it. 

 

Any suggestions? 

--

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

 

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  • On 20/03/14 17:26, Kirk Sceviour wrote:

    Hi;

     

    Looking for some help on getting the multiple Drain and Source pads of a

    N-Channel MOSFET to connect. All of these pins should be connected on the

    board to allow for the 1A capability. This device is a DMS3016SSS in SO8

    form factor. The device is N-MOSFET-So8S from transistor-power.lbr. I'ts

    not an exact match for the chip but close enough.

     

     

    Unfortunately it appears to be a broken library part.

     

    The source and drain both have multiple pins along the same line, so

    that they're largely hidden. The idea is that you connect to all of them

    with the same net, by clicking on each one along the line in the schematic.

     

    Unfortunately, as I said, it's broken, because in order to fit all the

    pins in a small space they have NOT been placed on a 0.1" grid, which

    makes it impossible to connect to all of them.

     

  • in reply to autodeskguest

    Thanks for the input. I was working on this while waiting for a reply. I

    solved the problem by rewiring the symbol to show each pin individually and

    wiring them appropriately in the schematic. I was beginning to think the

    part part was incorrectly made. I'm now able to connect the pins the way I

    want using a polygon with thermals.

     

    Thanks for your help.

    --

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

     

Reply
  • in reply to autodeskguest

    Thanks for the input. I was working on this while waiting for a reply. I

    solved the problem by rewiring the symbol to show each pin individually and

    wiring them appropriately in the schematic. I was beginning to think the

    part part was incorrectly made. I'm now able to connect the pins the way I

    want using a polygon with thermals.

     

    Thanks for your help.

    --

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

     

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