[SI-LIST] Re: Heatsink electrical isolation
- From: "Christopher R. Johnson" <crjohnson11@xxxxxxxxxxx>
- To: torocar@xxxxxxxxx
- Date: Mon, 30 Oct 2006 11:27:24 -0500
You can easily isolate the heat sink if you use nylon screws and a mica
heat sink. You will need heat sink compound on both sides of the
insulator. See http://www.google.com/search?&q=mica+insulator+to-220
for info on mica heat sinks for TO-220 packages.
As to whether you need to isolate it at all I would worry more about a
heat sink that was at a non-zero potential.
Regards,
Chris Johnson
Carlos Toro wrote:
>Hi all. What considerations should be used when electrically attaching
>heatsinks to a net in a PCB?. We have a TO-220 packaged IC and its back is
>grounded thus it will make the heatsink be grounded too. The Heatsink has
>pins for ensuring mechanical attachment to the PCB. Do these pins also need
>to be grounded?.
>For now the board is a prototype and one of our concerns is that this
>heatsink is about 2 inches high and might get in contact with a probe or a
>wire and create a short circuit with it. Should the board be enclosed in a
>plastic case in spite of being a prototype?. Is there other alternative for
>electrically isolating the heatsink without compromising its heat transfer
>benefits?.
>
>Thanks in advance.
>
>
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
