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Heat sink for Schottky diode

 
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chaztuna(at)adelphia.net
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PostPosted: Tue Jan 03, 2006 6:46 pm    Post subject: Heat sink for Schottky diode Reply with quote


Listers,
Someone asked about a source for a heat sink for the Schottky diodes sold
by Eric Jones of Perihelion Design. RV builder Scott Chastain turned me on
to a nice heat sink made specifically for this diode. Scott told me he got
his from Radio Shack. I got mine from Mouser Electronics. It's part number
567-680-125A This heat sink is made by Wakefield Thermal Solutions.
You can find it here
http://www.mouser.com/index.cfm?&handler=data.listcategory&D=*567680125A*&terms=567-680-125A&Ntt=*567680125A*&Dk=1&Ns=SField&N=0&crc=true
Charlie Kuss


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craig(at)craigandjean.com
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PostPosted: Tue Jan 03, 2006 7:46 pm    Post subject: Heat sink for Schottky diode Reply with quote


Slightly backwards. The "TO-3" transistor case has existed for decades. The
diode sold by Eric was designed to use the same footprint as a TO-3 case.
*Any* heat sink designed for a TO-3 case will (by design) work with the
diode. Unfortunately the only heat sinks I can find on Radio Shack's web
site are for the TO-220 case which is quite different from the TO-3 case.
Digikey certainly has heat sinks for the TO-3 footprint. Go to the link
below to see 51 matches for "heat sink to-3":
http://www.digikey.com/scripts/DkSearch/dksus.dll?Criteria?Ref=346699&Site=U
S&Cat=32506655
The other question is if you desire to electrically isolate the diode's
"back" from the heat sink. This is only needed for large heat sinks. A small
heat sink can easily be mechanically supported by the screws which fastens
the diode to the heat sink. In a larger heat sink you either electrically
isolate the heat sink from the main chassis or (better) isolate the chip's
case from the heat sink. The second approach leaves less exposed metal
around with a voltage on it.
Electrical isolation is done with thin plates placed between the chip and
the heat sink. In the old days the plate was mica. Heat sink "grease" is
used to ensure a good thermal bond between all the layers. There are newer
insulators that don't require the grease. If you are using metal nuts and
screws to bolt the chip down then you need special non-conducting shoulder
washers to keep the nuts and screws from forming electrical contact between
the chip's case and the heat sink.
That is more than you ever wanted to know about heat sinks. I will stop
rambling now.
-- Craig


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