Electronics > Repair
What is this Adhesive Thermal Pad?
Harry_22:
Hi all!
I would like to clarify what kind of thermal pad this is. It looks like a flexible fiber-reinforced mat. The surface is not sticky.
The transistor was removed only by heating it on a hotplate at 200 degrees plus heating the transistor metal tab by soldering iron.
The photo shows that there are particles of molten solder left on the contact pad.
I do not quite understand what is this technology and how to attach the transistor back without much destruction.
u666sa:
You could use this https://aliexpress.ru/item/1005005922520519.html
coromonadalix:
in some cases its when they deteriorate they become stickier ... unless really made like this ?
witch i only saw on old thermal pads i need to remove, and they almost ripped off parts ?
Audiorepair:
This is pretty common really.
You can separate the transistors from the pad by levering the legs against the heatsink, and they will pop off.
And you won't have to remove the whole heatsink plus transistors to do this.
By the time you come across this the heatsink pad is toast, you don't want to reuse it.
Simply lever off all the transistors and replace the pad with any kind of generic thermal sheet.
Or you could even ditch the sheet altogether and use Mica washers and heatsink compound like in the old days, which would no doubt give you a far higher thermal performance, should the application need or benefit from it.
The sheet is a cost saving manufacturing choice.
Harry_22:
Many thanks for the answers.
This sandwich is installed on completely new cutting-edge equipment. I have not seen this technology yet.
Typically transistors on such radiators are pressed by the spring plates. But here they rely only on magic word. I couldn't tear him off by the legs when it was cold and actually desoldered it as TO-263AB/D2-PAK.
Even drops of solder remained.
Obviously it needs to be glued. Drilling a hole is inconvenient due to the ribs located behind and a closed area for working with a screwdriver. Therefore I will need to install everything assembled.
But how to glue? Right on this pad? Because if you remove it, then how to maintain the gap between transistor and radiator?
Also possible to put Al2O3 and glue it on both sides. This will be a real sandwich!
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