Looking for some large TO-3 heatsinks

Discussion in 'Marketplace' started by DerStrom8, Jun 22, 2014.

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  1. DerStrom8

    Thread Starter Well-Known Member

    Feb 20, 2011
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    Hi guys,

    I'm in need of a couple large TO-3 heat sinks, preferably ones that can hold 4+ TO-3s each. There are some on ebay which I might buy, but I wanted to see if I could find a better deal first. So, do any of you guys happen to have some you'd like to get rid of? ;)

    Thanks,
    Matt
     
  2. Nykolas

    Member

    Aug 27, 2013
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    How large is large? If looks do not matter go the Bob Pease way and use VW cylinder heads. Thermal resistance is about 0.5 Deg. C/Watt. E
     
  3. DerStrom8

    Thread Starter Well-Known Member

    Feb 20, 2011
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    Ideally I'm looking for something like this:

    [​IMG]


    but would be able to make do quite well with something like this:

    [​IMG]

    Never thought of using cylinder heads....
     
  4. MrChips

    Moderator

    Oct 2, 2009
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    I have to check my stock and let you know tomorrow.
     
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  5. MrChips

    Moderator

    Oct 2, 2009
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    I have similar to the smaller one you have shown.

    3" x 4" x 1"

    some with single TO-3, some with dual TO-3.
     
  6. MrChips

    Moderator

    Oct 2, 2009
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    I have one Delta Semiconductor NC-441 with four TO-3 holes.

    5.5" x 4" x 4" approx.

    [​IMG]
    [​IMG]
     
  7. DerStrom8

    Thread Starter Well-Known Member

    Feb 20, 2011
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    Hi MrChips,

    Those do look good. I'll need a total of 8 MOSFETs for this project though, and I'm not sure how many heat sinks you've got.

    At this point I'm just exploring options, but feel free to PM me if you want to discuss this privately.

    Thanks,
    Matt
     
  8. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    Old junky TO3 heatsinks should be dirt cheap on ebay.

    It's incredibly rare for anyone to have a use for them these days.
     
  9. DerStrom8

    Thread Starter Well-Known Member

    Feb 20, 2011
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    Thing is that the FETs will be switching upwards of 30A (maybe more, haven't done all the math yet), so the old cheap ones really won't be sufficient.
     
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