JLCPCB - 4 Layers Minimum Design Rules

Marcel R. OP #5922525
Rate this post
• ▲ useful
▼ not useful 
Dear community,

has anyone fabricated a 4Layer PCB with JLCPCB? On their website 
(https://jlcpcb.com/capabilities/Capabilities), they say that the

*minimum trace-width is 3.5mil
*minimum trace-to-trace distance is 3.5mil

Unfortunately, JLCPCB rejected my PCB and replied as followed:

1
----------------------------------------------------------

2
Hello Sir ,

3
Many thanks for your order . But sorry to bother you . 

4
As the picture ,we found the trace width and trace clearance is only 0.089mm ,and the spacing between traces is too small ,we need Min.0.25mm spacing . 

5
Below are some information.

6
 

7
The minimum via diameter : 0.45mm 

8


9
The Min drill hole :Min. 0.3mm for 2-layer board ,Min. 0.2mm for 4-layer/6layer board

10
Trace width and trace clearance :Min. 0.1mm 

11


12
Thanks!

13
Marcel

14


15
The spacing from trace to through pads : Min 0.127MM

16
The spacing from hole to trace :Min. 0.25mm

17
The spacing from hole to hole :Min. 0.25mm

18
----------------------------------------------------------

These specs differ greatly from the official ones, right? Firstly, a 
100um trace width corresponds to 3.9mil and not 3.5mil as opposed to 
their website. Secondly, a trace-to-trace spacing of 0.25 (I assume they 
measure from mid trace to mid trace) is also significantly larger.

Anyone have/had similar problems with JLCPCB, so far?
Reply Quote Edit Move Thread sperren Anmeldepflicht aktivieren Anpinnen Delete topic Thread mit anderem zusammenführen Report post
Georg Guest #5922827
Rate this post
• ▲ useful
▼ not useful 
Marcel R. wrote:
> *minimum trace-to-trace distance is 3.5mil

Marcel R. wrote:
> the spacing between traces is too small ,we need Min.0.25mm spacing .

Many manufacturers have different classes and different prices for them 
- smaller design rules result in higher prices. May be you ordered PCBs 
with 0.25 mm spacing and you could also have 3,5 mil spacing, but for a 
substantially higher price.

But the correct answer you can only get from the manufacturer himself.

Georg
Reply Quote Edit Delete Report post
Alex Guest #6042996
Rate this post
• ▲ useful
▼ not useful 
For a prototype I needed a 6 layer PCB (with a BGA 0.8mm on it) and 
decided to give JLC a try (in the past I ordered several 2L-designs and 
was satisfied with the quality).

They accepted my design (4 mil spacing), but when I got the boards I 
first realised that all the thermals on the pads were removed.

After further investigation it seems that they just increased the 
isolation distance to about 8 mil?
Some ground plane connections on the top and bottom layer are now 
missing, I think I don't want to know what how they messed up the inner 
layers.

I filed a complaint and got the answer that the minimum gap is 10 mil.

Actually, this is not what they write on the website.


Conclusion:
Good for simple 2L-boards,
crap for designs with tight tolerances.
And dont't trust the specs on the website!

Alex
Reply Quote Edit Delete Report post
Mampf Guest #6043152
Rate this post
• ▲ useful
▼ not useful 
Had just a couple of months ago a design with 3.5mil tracks and 3.5mil 
spacing.

The only thing which they didn't like was less than 3.5mil spacing to a 
plated through-hole. But they changed the restring of the hole.

It was a 4-layer board.

Everyting worked fine and they didn't complain further.
Reply Quote Edit Delete Report post
Watch this topic

Reply

Note: the original post is older than 6 months. Please don't ask any new questions in this thread, but start a new one.

Formatting
  • [c]C-Code[/c]
  • [code]code in other languages, ASCII drawings[/code]
  • [math]formula (LaTeX syntax)[/math]
  • [[Title]] – link to an article
  • Link to another post: right-click its post ID (#8078628), copy the address, paste it into the text

More about formatting

Post long source code as an attachment, not in the text.

Your name and e-mail address

Already registered? Log in

Not shown to anyone. We send you a link; your post appears once you confirm it there.

By submitting you create a free account and accept the terms of use.