Dangerous Prototypes Open Source Hardware

PCB specification

August 01, 2016, 02:27:42 pm

Hi,

From the spec shown in your website, the minimum trace width/spacing is 5/5 mils, and minimum finished hole diameter is 12 mil.

I want to know whether 4 mil trace width design is still ok for you or not.
Since my design is RF related and the MCU design require many 4 mil traces on the top layer (for 4-layer 1.6mm thickness PCB).

Besides the trace width, my via hole diameter is 10 mil instead of 12 mil. Is it ok?

If you process can achieve 4 mil trace width and 10 mil hole diameter, is the yield good enough?

Thank you.

Regards
Mr Yan

Re: PCB specification

Reply #1 – August 01, 2016, 08:10:33 pm

My guess it wont work. They aren't minimum values for nothing right?

I think the 5/5 is already optimistic

Re: PCB specification

Reply #2 – August 02, 2016, 03:56:08 am

You say on your website that you have 8 Chinese suppliers now.
So all of them, the capabilities are:
min w/s 5/5 mil, min via hole size 12 mil
Is it correct?

Re: PCB specification

Reply #3 – August 02, 2016, 04:02:10 am

Pretty much. Even our top notch suppliers don't want to take orders for 4/4

Re: PCB specification

Reply #4 – August 02, 2016, 04:25:11 am

So that means, your PCB board fabrication services are more targeted for school project, hobbies.. rather than professional commercial projects in the company in consumer or other industrial fields.
Am I correct?

Re: PCB specification

Reply #5 – August 02, 2016, 10:31:51 am

[quote author="rfyan"]So that means, your PCB board fabrication services are more targeted for school project, hobbies.. rather than professional commercial projects in the company in consumer or other industrial fields.
Am I correct?[/quote]

Jups, we are dirty..

Re: PCB specification

Reply #6 – August 04, 2016, 10:07:14 am

Well yes, of course that is obviously our market though we have lots of commercial clients as well. But beyond that, if you find a supplier who will do prototype runs of 4/4 please let me know and I will add them.

I'm based in Shenzhen, I've talked to every board house I can find and nobody does 4/4 unless it is production quantity. I guess the Chinese manufacturing ecosystem is more targeted for school projects and hobbies... :P