SOT-89-5 Footprint forExpress PCB or Eagle Cad?

Discussion in 'General Electronics Chat' started by spinnaker, Oct 22, 2012.

  1. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
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    Does any one happen to have a footprint for SOT-89-5 package?

    Since I am familiar with Express PCB, I would prefer that but something tells me I will need to buckle down and learn Eagle CAD. :(

    Or maybe some other PCB CAD software that is easy to use? I really like how Express PCB can couple the schematic to the PCB design. I suspect Eagle CAD does the same?
     
  2. JohnInTX

    Moderator

    Jun 26, 2012
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    There is a SOT-89 in smd-ipc.lbr but its not 5 lead. I would start there and edit it as necessary.
     
  3. t06afre

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    May 11, 2009
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  4. spinnaker

    Thread Starter AAC Fanatic!

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    The SOT-89-5 footprints I have seen have a pad under the chip. I have seen different shapes. I assume the pad is to help dissipate heat? So does the shape of that pad really matter?
     
  5. t06afre

    AAC Fanatic!

    May 11, 2009
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    The pad should at least have an area and shape that is slightly bigger than the conductive surface on the chip. If you use the snap/grid function in your PCB tool correct it is quite easy to draw a new footprint
     
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