[TechAssist] Re: Heat sink compound
- From: Edward Gaidies <teltek3@xxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 9 Oct 2004 09:03:41 -0400
Yup...that sounds legitimate.
Next..
-Ed-
*****************************************************************
Ed Gaidies
Tel-Tek Electronics
Ontario-Canada
teltek3@xxxxxxxxxxxx
teltek@xxxxxxxxx
On 9-Oct-04, at 8:31 AM, Damon wrote:
> Simple thermodynamics.....a hotter body transfers its heat to a cooler
> body,
> because a cooler body can absorb "heat energy".
>
> If the transistor is cooler than the heatsink, then heat would
> transfer into
> it, and we all know we don't want that happening...also if the
> transistor is
> the only heat source on that heatsink, the source will always be
> higher
> temp or the same temp as the 'sink, and you don't want the 'sink at
> the same
> temp as the source, something about thermal lock (causes steam
> locomotives
> to stop running).
>
> Damon Brunger
> Telrad Electronics
> Fort Wayne, IN
> ----- Original Message -----
> From: "Bil Green" <tv.vcrrepair@xxxxxxxxxxx>
> To: "gulftech@xxxxxxxx" <techassist@xxxxxxxxxxxxx>
> Sent: Friday, October 08, 2004 11:03 PM
> Subject: [TechAssist] Re: Heat sink compound
>
>
> | I am simply reporting what I have noticed when touching the plastic
> | body of the transistor or chip. And another tech mentioned the same
> | thing in his post.
> |
> | When you try to remove a plastic container from a 350 degree oven
> | it doesn't feel anywhere near as hot as a glass container. So maybe
> | the plastic portion of the transistor isn't as hot.
> |
> | I can hold my finger on a hot HOT for a few seconds, but often the
> | heat sink is too hot to even touch. Do you guys think this is just
> | my imagination?
> |
> |
> |
> | Bil Green
> | PC 1000
> | Mammoth Lakes, CA 93546
> | 760-924-1000
> |
> | Friday, October 8, 2004, 7:39:43 PM, you wrote:
> |
> | gjc> Come on Bill,
> |
> | gjc> I respect you and very much enjoy your posts. But, it is
> impossible
> for
> | gjc> a heat sink to be hotter than the transistor attached to it. I
> have
> a
> | gjc> laser thermometer that I use. NEVER have I seen the heat sink
> to be
> | gjc> hotter than the transistor. After all, where does the heat come
> from?
> |
> | gjc> Plastic transistors are hardest to test, but the highest
> temperature
> | gjc> measured would be equal to or lower than the actual temp. of the
> | gjc> semiconductor.
> |
> |
> | gjc> Ken Smith
> | gjc> Gulf Technical Services
> | gjc> 3034 Gulf Breeze Parkway
> | gjc> Gulf Breeze, FL 32563
> | gjc> 850-934-8324 (Voice), 850-932-0819 (fax)
> |
> | gjc> On Fri, 8 Oct 2004 14:00:41 -0700 Bil Green
> <tv.vcrrepair@xxxxxxxxxxx>
> | gjc> writes:
> | >> Actually I'm right. When you place your finger against the plastic
> | >> section of a transistor or IC which is on a heat sink the
> | >> temperature usually feels cooler the heat sink.
> | >>
> | >> You can't place your finger on the rear (often metal) side which
> is
> | >> against the heat sink (and may be much hotter).
> | >>
> | >> But the heat sink is often hot enough to burn your finger (and
> | >> often the device is definitely NOT). Now maybe the plastic just
> | >> doesn't transfer the heat to your finger very well. I'm don't care
> | >> about science at this point, only what I see or feel.
> | >>
> | >>
> | >> Bil Green
> | >> PC 1000
> | >> Mammoth Lakes, CA 93546
> | >> 760-924-1000
> | >>
> | >> Friday, October 8, 2004, 1:22:50 PM, you wrote:
> | >>
> | >> TTE> Bil...
> | >> TTE> Now you know better then that.
> | >> TTE> Basic Science.;-)
> | >> TTE> That would be Thermal Energy in reverse. The source has to be
> | >> more then
> | >> TTE> the dissipation.
> | >>
> | >> TTE> Ask Wayne.;-)
> | >>
> | >> TTE> -Ed-
> | >>
> | >> TTE> Tel-Tek Electronics
> | >> TTE> Ontario-Canada
> | >>
> | >> TTE> teltek3@xxxxxxxxxxxx
> | >> TTE> teltek@xxxxxxxxx
> | >>
> | >>
> | >> TTE> -----Original Message-----
> | >> TTE> From: techassist-bounce@xxxxxxxxxxxxx
> | >> TTE> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Bil
> Green
> | >> TTE> Sent: Friday, October 08, 2004 3:57 PM
> | >> TTE> To: J Silverman
> | >> TTE> Subject: [TechAssist] Re: Heat sink compound
> | >>
> | >> TTE> Isn't the heat sink always hotter than the device? Heat rises
> | >> and is
> | >> TTE> stored by the heat sink.
> | >>
> | >>
> | >> TTE> Bil Green
> | >> TTE> PC 1000
> | >> TTE> Mammoth Lakes, CA 93546
> | >> TTE> 760-924-1000
> | >>
> | >> TTE> Friday, October 8, 2004, 9:50:46 AM, you wrote:
> | >>
> | >> JS>> So it sucks so much heat out that the heat sink is hotter
> than
> | >> the
> | >> TTE> devices
> | >> JS>> doing the heating? Patent it quick!
> | >> JS>> Jerry Silverman
> | >> JS>> Greentron Inc
> | >> JS>> 4 Newland Ave
> | >> JS>> Greenville SC 29609
> | >> JS>> Fax/Phone 864 232 3889
> | >> JS>> mail to: greentron@xxxxxxx
> | >> JS>> ----- Original Message -----
> | >> JS>> From: "Bil Green" <tv.vcrrepair@xxxxxxxxxxx>
> | >> JS>> To: "Paul" <techassist@xxxxxxxxxxxxx>
> | >> JS>> Sent: Thursday, October 07, 2004 4:46 PM
> | >> JS>> Subject: [TechAssist] Re: Heat sink compound
> | >>
> | >>
> | >> >>> I have been using silicone grease. It's available in a tube,
> | >> used for
> | >> >>> servicing pools and hot tubs, also boats. Designed for high
> heat
> | >> >>> applications. Has worked well for many years (and it's clear).
> | >> >>>
> | >> >>> The heat sinks get much hotter than the transistors and chips
> so
> | >> I
> | >> >>> know for sure that it's working.
> | >> >>>
> | >> >>>
> | >> >>> Bil Green
> | >> >>> PC 1000
> | >> >>> Mammoth Lakes, CA 93546
> | >> >>> 760-924-1000
> | >> >>>
> | >> >>> Thursday, October 7, 2004, 10:10:38 AM, you wrote:
> | >> >>>
> | >> >>> P> Hi Al, been using GC silicone 10-8101 for about 20 years.
> | >> Never
> | >> TTE> had a
> | >> JS>> repeat failure due to its use. I like it because it is less
> | >> messy
> | >> TTE> than the
> | >> JS>> white or pink stuff the mfgs use.
> | >> >>> P>
> | >> JS>> Paul
> | >> >>> P> al m <ampm@xxxxxxx> wrote:
> | >> >>> P> I know it's off topic but I haven't thought of what I was
> | >> buying
> | >> JS>> before.
> | >> >>> P> Which is better the non silicone or the silicone compound?
> | >> >>> P> Al Marquardt
> | >> >>> P> ampm@xxxxxxx
> | >> >>> P> Al Marquardt Electronic Repair
> | >> >>> P> 206 W Main
> | >> >>> P> Girardville Pa. 17935
> | >> >>>
> | >> >>>
> | >> >>>
> | >> >>>
> | >> P>>>
> | >> TTE>
> | >>
> |
> gjc>
> -----------------------------------------------------------------------
> -
> | >> TTE> -
> | >> JS>> ----
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> | >> >>>
> | >> >>> P> Paul ,B
> | >> >>> P> Central TV&Video
> | >> >>> P> 911W Grand Ave
> | >> >>> P> Grover Beach Ca.
> | >> >>> P> (805)481-8084
> | >> >>>
> | >> >>>
> | >> >>>
> | >> P>>>
> | >> TTE>
> | >>
> |
> gjc>
> -----------------------------------------------------------------------
> -
> | >> TTE> -
> | >> JS>> ----
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> | >> >>>
> | >> TTE>
> | >>
> |
> gjc>
> -----------------------------------------------------------------------
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> | >> JS>>
> | >> TTE>
> | >>
> |
> gjc>
> -----------------------------------------------------------------------
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> | >> TTE>
> | >>
> |
> gjc>
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> | >>
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> gjc>
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