MOSFET PCB routing (SC70-6)

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1

Hello,

Does anybody know why is PowerPAK SC70-6 Source terminal connection is a little weird? Why is it split into two parts?

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How should I route it / them?

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Thanks in advance.

2

  • For heat dissipation.

  • Be careful you that don’t connect the Drain and Source under the chip.

1 Like
3

I understand that regarding the drain terminal, which is much bigger area than the two source terminals combined. But the Source, especially the small separated PIN 4? I don't think so.

Be careful you that don’t connect the Drain and Source under the chip.

Luckily KiCad would not allow me to do that anyway.

4
  • Drain current is equal to the Source current, it’s my guess the manufacture found it was necessary to remove heat from the Source element. :thinking:
5

Strangely enough the copper zone does not properly fill:

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6

This is my best shot so far.

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Not great, not terrible. :smiley:

7

Something looks inverted to me between the package diagram and the footprint. Is red the upper copper layer and is that a 'top' view of the package?

8

Thanks for checking, but the package is in bottom view.

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9

I see it now. That perspective drawing makes an interesting optical illusion. I thought it was a "see through" top view when I first saw it. That could have unpleasant consequences if you're designing a footprint.

10

I agree, it's a bit tricky.

11

I believe the datasheet would have the final word on this topic.

12

You mean about the routing for this particular MOSFET?
Unfortunately, I didn't find any relevant info there: SiA445EDJ.

13

I think the cleanest way to do this Kicad is create a small zone around the pads, with clearance set to 0. Hopefully that creates a solid fill and keeps DRC happy.

I couldn't find any reference designs using this package. Also, might be worth asking on forum.kicad.info

14

Found these at Kicads community contribution page:

Use symbol SiA449DJ

Vishay_PowerPAK_SC70-6L_Single

15

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