A DTP MCPCB, also or better known as thermoelectric separation bla bla bla at the other side, is expected to show electrical conductivity between the thermal pad and the back of the board.
Yes there is if you know what to look for. I'll use a few examples:
The left board type I bought once, it is not DTP and can be seen in the substrate. The thermal pad seems like a track which is floating over a dielectric layer, pretty much like both anode and cathode tracks. The right board stinks too, imho.
The above are DTP or thermoelectric separated boards (bought and have both). Notice the outlines around the thermal pads, they're sort of window shaped, profiled strictly around the thermal pad and the contact points. Being DTP it does not need to be any bigger since it is not a track whose surface matters like in the previous examples, i.e. it is the whole board core.
Just as I thought when I compared to KD’s mcpcb. Confirms that mine aren’t dtp for the Osram red, I’ll reflow one to the KD board. It’ll be great if I can drive them harder.
They’re currently on 3535 so using 3030 may improve too
I was going to buy Convoy’s newly added 3030 boards but can’t tell by photo if really dtp?
That “HX” from AE (YinDing) seems off. What’s with the exposed gray portion next to the die? Also, their other white flat listings have unusual markings on the surrounding white areas of the package.