Has anybody else tried it? (SKU: 126722)
Its a lot cheaper than Sinkpads @$6.70 for 10, but appears to have the unwanted dielectric layer. Does anyone know how much heat transfer resistance the dielectric layer has, or if you could solve the problem by scraping it off with an X-acto?
Avoid these - Thickness: 1.2mm.
Someone posted that they don’t do a very good job at conducting heat to the perimeter of the pad because they are far to thin (as are all known copper chinese sink pads at this time). 2mm is said to be optimal thickness for copper pads.
The pad thickness shouldn’t be a problem if the contact between the pad and the heat sink is conductive.
What method do you attach the pad to the heat sink with?
Also, if the DX design still has the dielectric between the solder pad and base, it won’t be nearly as good as the Sinkpad design.
I have read that lot of people don’t want that layer, but what is it’s actual R-value?
<1W/mK IIRC. Worse than any cheap thermal paste..
I've used them extensively since I changed a T6 1A on alu pcb to a T6 1A on this pcb and got more than +25% lux. (Am a throw guy, lumens do not wow me)
And they were available a year + ago, in great quantity at reasonable prices compared to SinkPad and the copper pcb's in either Int. Outdoors or Led Tech.de that I were aware existed.
Have fun.
Is there a number in K/W?
For how much surface area?
That would be the thermal resistance. Thermal resistance is the reciprocal of thermal conductivity.
1W/(m²*K) would be 1K/W then.. maybe. :D I dont know much about that but I bet PilotPTK does. ;)
Anyways, dielectric is bad. Several tests have shown that.
PilotPTK: Thanks for the post, the XM-L pad is about 0.15 cm2.
I found some numbers on the internet for ” ‘high’ thermal conductivity dielectric MCPCBs”: 1 to 3 W/mK @ 75 to 150 um.
The values crunch out between 2 and 10 K/W 