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Hand soldering SO8 with GND paddle

Discussion in 'Electronic Design' started by Andrew Holme, Dec 30, 2009.

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  1. Andrew Holme

    Andrew Holme Guest

    Any tips on ways to hand solder SO8 packages which have a GND pad
    underneath? I'm doing a PCB layout for a hobby project using one of these
    devices so I could for example put a large plated through via under the
    device big enough to get my soldering iron tip into. Is that a bad idea?

    The device is a high-speed prescaler which dissipates ~ 350mW. The GND pad
    not only needs to be well grounded for RF but also needs a low thermal
    resistance to remove all that heat.

    My board is standard 2-layer FR4 with an almost continuous ground plane on
    the bottom.

  2. Nico Coesel

    Nico Coesel Guest

    You better put 5 or 6 32 mil / 0.8mm vias underneath it. If you pour
    solder in on or two vias it will come up through the other vias.
  3. Sounds good to me for a hobby project - I did this for a QFN and it
    worked fine.
  4. qrk

    qrk Guest

    Large via under the thermal pad works.

    You can also solder this in a toaster oven or waffle iron with the
    flat plates. Tin both the thermal pad and PCB pad. The solder bumps
    should touch, but don't make the bumps too big or the part will float.
    Coat with a little flux and bake.
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