Hi,

I'm looking for a really small size heatsink for my project for COB or STARBOARD.
I found this heatsink, and the dimension is really small and the Thermal Resistance is compatible to other bigger heatsinks, i'm not sure if i have misunderstood the datasheet and wish some advice & help of the application of this type of heatsink. Is this for SMD LED only ?

http://www.ohmite.com/cat/sink_svled.pdf

Thank you!

 

It may be intended for LED modules, but you can use it on anything that you can get a good thermal mounting to.

Since I have no idea what you mean by COB or STARBOARD, let alone what you are trying to do and what your needs are, I really can't say much more.

 

@WBahn

Thanks for your reply.
Sorry i meant LED Chip On board, and LED starboard.
I'm trying to make a lighting however i have limited space so im looking for a small heatsink.
However comparing with the other heatsinks that i saw, this one is exceptionally small with the same thermal resistance so i couldn't comprehend how that is possible so i just want to double confirm of it's application.

 

Ohmite is a very good company. You can trust them.

 

The thermal resistance of the heatsink is known..
Now whats the stated thermal resistance (junction to sink) of your LED on starboard/COB?

Assuming you use the first one with a thermal resistance of 9 degC/W and if your LED is a 3W version you know right now that its going to be 27degC over ambient for just the heatsink.. Now we need to add in the LED/starboard..
Example... if your LED/package is 11 deg C/W (including thermal grease) then with 3W you are looking at 3 x 20 = 60degC over ambient.. So with a 25 deg ambient your LED junction would be running at 85degC.

From memory I think typical 3W star boards are like 5deg C/W.. Plus 1degC/w for thermal grease.. now you just need the LED spec to add to that. (junction to case) and your question is answered

 

Nice heat sink. I like all those beautiful fins!