[TechAssist] Re: Heat sink compound

  • From: Edward Gaidies <teltek3@xxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Sat, 9 Oct 2004 08:36:46 -0400

What..no debate?
I just pulled all my High School Science notes out.;-)

-Ed-
*****************************************************************
Ed Gaidies      
Tel-Tek Electronics
Ontario-Canada
teltek3@xxxxxxxxxxxx
teltek@xxxxxxxxx        

On 9-Oct-04, at 1:33 AM, Bil Green wrote:

> I agree. For those who are keeping score, at this time it appears to
> be a draw. Heat sinks are never hotter than the device they are
> cooling, and then again they are (several replies).
>
> Thanks for all your input
>
>
> Bil Green
> PC 1000
> Mammoth Lakes, CA 93546
> 760-924-1000
>
> Friday, October 8, 2004, 9:16:47 PM, you wrote:
>
> EG> Yes,;-)
>
> EG> Let it go...
>
> EG> It's like that  question I asked my Secretary.
>
>
> EG> I'm going down the Highway..in my Van.
> EG> My speed is 70..Fly comes and sits on my nose,,I keep  
> swatting...buzzes
> EG> around..relands on my nose.
> EG> Now..is that fly using gravity..relation to motion..air  
> relation..??
> EG> Some "Rednecks" will question the "70" for miles or Kms. Never  
> mind. ;-)
>
>
> EG> -Ed-
> EG> *****************************************************************
> EG> Ed Gaidies
> EG> Tel-Tek Electronics
> EG> Ontario-Canada
> EG> teltek3@xxxxxxxxxxxx
> EG> teltek@xxxxxxxxx
>
> EG> On 9-Oct-04, at 12:03 AM, Bil Green wrote:
>
>>> 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>
>>> --------------------------------------------------------------------- 
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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>
>>>>>
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>>>>>>>>
>>>>> TTE>
>>>>>
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