Author Topic: 1.6mm PCB of 4 layers and super thin Pre-Preg?  (Read 18890 times)

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Offline FaringdonTopic starter

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1.6mm PCB of 4 layers and super thin Pre-Preg?
« on: April 10, 2024, 07:04:15 pm »
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?
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Online langwadt

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Re: 1.6mm PCB of 4 layers and super thin Pre-Preg?
« Reply #1 on: April 10, 2024, 07:15:50 pm »
you can't use google?
 
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Online tggzzz

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Re: 1.6mm PCB of 4 layers and super thin Pre-Preg?
« Reply #2 on: April 10, 2024, 07:51:16 pm »
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.
There are lies, damned lies, statistics - and ADC/DAC specs.
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Online tggzzz

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Re: 1.6mm PCB of 4 layers and super thin Pre-Preg?
« Reply #3 on: April 10, 2024, 07:53:25 pm »
you can't use google?

Google doesn't chat to you.

Maybe there's hope when Google introduces LLMs into search results.
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
Having fun doing more, with less
 
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Online langwadt

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Re: 1.6mm PCB of 4 layers and super thin Pre-Preg?
« Reply #4 on: April 10, 2024, 08:12:23 pm »
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
 
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Offline mzzj

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Re: 1.6mm PCB of 4 layers and super thin Pre-Preg?
« Reply #5 on: April 14, 2024, 04:39:49 pm »
Yes, I agree.
 
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Offline FaringdonTopic starter

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Re: 1.6mm PCB of 4 layers and super thin Pre-Preg?
« Reply #6 on: April 16, 2024, 05:59:52 pm »
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.
« Last Edit: April 16, 2024, 06:02:03 pm by Faringdon »
'Perfection' is the enemy of 'perfectly satisfactory'
 

Online Gyro

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Re: 1.6mm PCB of 4 layers and super thin Pre-Preg?
« Reply #7 on: April 16, 2024, 07:40:01 pm »
...
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?
Best Regards, Chris
 
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Offline cearlobe

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Re: 1.6mm PCB of 4 layers and super thin Pre-Preg?
« Reply #8 on: April 17, 2024, 09:56:58 am »

... 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?
 
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