Where to find MCPCB raw material with copper core ?

Hello,

I’d like to make MCPCBs for leds myself, but the only raw MCPCBs I found are aluminium core, they also only have 35μm/1oz copper thickness which I think is too thin for our high current leds.

Do you know were to find raw copper core PCBs ? Also has anybody made custom mcpcb themselves here ?

I think I saw a thread in a different forum about a mcpcb made from silver. I just dont remember where it was.

Base material is not a bottleneck. Dielectric layer is a bottleneck.
If you really need custom direct thermal path copper pcb, you can order any thin fr-4 pcb with hole placed under led thermal pad, and order milled CU base with matching protrusion.

This would be a mcpcb for E21As and they don’t have a thermal pad so no possibility for DTP, if aluminium is fine then that’s good.

As for the dielectric layer, in the boards I found it has a thermal conductivity of 1.45W/m.K with a thickness of 110-130 um, quite far from the ~7W/m.K and 10 um thickness of Virence alu mcpcb (50um for the copper one).
How bad is that ?

Thing is they’re the only boards I found…

It’s bad. E21 is sensitive to heat.

With a driver which regulates on the positive side you could have a DTP E21A, done the way kiriba-ru mentioned.

With half of the led on the thermaly insulating fr4 ? That doesn’t sound like a good idea…? plus this is too complicated for me to make (machined copper base, and the e21a aren’t particularly easy to reflow either, I feel that would make things worse due to tolerances), this sounds much more feasible with a copper mcpcb by removing the dielectric layer on one pad, especially since in my project the body can be isolated from the battery. But that means I’m back to the start, finding copper mcpcb.

edit: Ah Virence had ” copper mcpcbs with 100µm, 3W/m.K dieliectric layer for e21a”:https://www.virence.com/product-page/vr10s1-vr10s1-757 , and performance remained similar to the alu mcpcb with 10µm, 7.5W/m.K dielectric layer up to ~1.75A, that’s with a 5000K CRI70 e21a though, a warm 9080 will put more heat…

I would be ok with 1.25~1.75A, so an alu mcpcb with a slightly better dielectric layer than the one I found (1.45W/m.K, ~120µm) would probably be ok ?