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Double sided sticky thermal pad..?

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grizedale

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Hello,

We need to stick 2cm by 3cm LED PCB's to an aluminium heatsink.

Do you know of a cheap , double sided sticky thermal pad that can be used for this?

Ideally we want it cheap and big enough to overlap the PCB at all sides so that we can be sure that the assembly staff have put it on properly , covering the whole of the interface of the pcb with the aluminium heatsink.

Glues tend to dry up on production lines, and thermal paste is awkward and can give rise to gaps if not fully pasted.
 

Not sure what cheap is, but there are plenty of them by 3M and Fischer, if you search for "thermal adhesive pad" at Farnell.
I've used ones from Farnell to stick high-power LEDs directly onto a small BGA style heatsink in the past, (but I only ran a single LED
per heatsink at 350mA).
Maybe better to bolt a large heatsink onto the PCB?
 
we dont want the extra production step of bolting.....its four led pcbs on each face of a vertical rectangular aluminium bar
 

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