1.6mm PCB of 4 layers and super thin Pre-Preg?

[Faringdon]

Hi,
Supposing we have a 1.6mm 4 layer (SMPS) PCB (DCDC 24Vin to 12Vout at 3A)
Is it possible to have a 1.2mm FR4 core , and then super thin prepregs around that?

[langwadt]

you can't use google?

[tggzzz]

Hi,
Supposing we have a 1.6mm 4 layer (SMPS) PCB (DCDC 24Vin to 12Vout at 3A)
Is it possible to have a 1.2mm FR4 core , and then super thin prepregs around that?

Consider using mega thin prepregs, or even ultra thin prepregs.

[tggzzz]

you can't use google?

Google doesn't chat to you.

Maybe there's hope when Google introduces LLMs into search results.

[langwadt]

you can't use google?

Google doesn't chat to you.

I guess if the intend is not get an answer just but to stir the shit google isn't much help

[mzzj]

Yes, I agree.

[Faringdon]

Thanks, yes , it is  out there , as you kindly say..
https://jlcpcb.com/impedance

...we are now seeking  a 1mm thick board , 4 layers, each 2oz, and no core, just pre-preg separating the copper layers.
But we cant find anybody who does this?

We like it that pre-preg is soft and rubbery and compressable, and we want that, not the tough  rigid core.

[Gyro]

...
We like it that pre-preg is soft and rubbery and compressable, and we want that, not the tough  rigid core.

And the copper tracks, and more importantly, their attachment to the vias?

[cearlobe]

... and no core, just pre-preg separating the copper layers.
But we cant find anybody who does this?

We like it that pre-preg is soft and rubbery and compressable, and we want that, not the tough  rigid core.

So what is the copper attached to while it's etched? Or have you got a way of depositing the individual copper tracks and shapes directly onto the surfaces of the pre-preg?

And what about layer-layer registration? And dozens of other issues?