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Old 7th November 2003, 08:01 PM   #1
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Default Insulating Pads.

Where can I purchase inslating pads for a pair of LM3875 T opamps in the US?
Thanks Steve.
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Old 7th November 2003, 11:21 PM   #2
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If you don't mind cutting them out from TO-3 sized Silpads (and the size is big enough) I can send them to you for free
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Old 8th November 2003, 01:16 AM   #3
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Or you could get those BIG sheets from farnell or RS and cut them out...and make a hole in them...
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Old 8th November 2003, 02:17 AM   #4
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Thanks Peter. I`ve just Emailed you with my mailing address etc. Thanks for the kind offer.
Steve.
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Old 8th November 2003, 03:46 AM   #5
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scissors work fine -- I use TO-3 pads too -- but Peter, I think that your method of mounting the device with a bar, rather than one screw probably results in a much better thermal transfer function. (oh well, lucky me, I just tapped some aluminum heat sink stock for 4-40 screws).
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Old 8th November 2003, 05:27 AM   #6
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yeah...the bar helps dissapate heat from the "front" also...guess he could only do better if he potted the whole chip in some metal or something...
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Old 8th November 2003, 05:57 AM   #7
ronc is offline ronc  United States
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Never use pads, just a very very thin coating of thermal grease and a pressure bar. Of course the H/S is isolated from the cab, for both electrical and vibration control.
ron
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Old 8th November 2003, 06:24 AM   #8
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the pads are for isolation dude....
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Old 8th November 2003, 12:13 PM   #9
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the TF version is insulated -- but you will note from the apnote that it requires a bigger heat sink
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Old 8th November 2003, 12:42 PM   #10
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Unfortunately...not everyone likes the insulated version...he just asked about pads and you are tell mi the non-isolated version doesn't need pads...the original poster might get a bit confused you know...
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