Author Topic: What is this PCB vendor asking?  (Read 456 times)

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Offline robertbaruch

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What is this PCB vendor asking?
« on: January 12, 2018, 02:48:02 PM »
I sent in a PCB to a vendor in China that really looks over the design for potential problems. Usually I can figure out what the problem is, but this time I'm pretty stumped. Does anyone have any idea what they are asking for?

"second, these places on the solder mask layer will be opening wholely or will be fabricated as the green oil bridge?"

And they included a pretty low-resolution image:



 

Online sleemanj

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Re: What is this PCB vendor asking?
« Reply #1 on: January 12, 2018, 02:58:06 PM »
They want to know if you require soldermask between the fingers (pads) on tha connector, or if they can just remove soldermask from that entirely.

Thin soldermask slivers can be a problem.

"Green oil" = soldermask
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Online blueskull

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Re: What is this PCB vendor asking?
« Reply #2 on: January 12, 2018, 02:58:19 PM »
Your minimum solder mask width is too small, and/or your solder mask to copper clearance is too small.
You need to revise your design, otherwise they will remove the solder mask in affected areas.
If the design is manufactured as is, you may end up having a board with solder mask covering copper or being deposited incorrectly.
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Offline TimNJ

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Re: What is this PCB vendor asking?
« Reply #3 on: January 12, 2018, 02:59:24 PM »
If I had to guess, they are asking if you want to pull back soldermask between the pins of the ICs and your card edge connector.

For instance, most PCI (and similar) cards do not have solder mask between the connector. Just bare FR4.



Edit: Ah yes, beat me to it.

Offline robertbaruch

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Re: What is this PCB vendor asking?
« Reply #4 on: January 12, 2018, 03:13:17 PM »
I think I see. They're objecting to the ultrathin soldermask between the fine pitch pins. That makes sense.

Thanks all!
 

Offline robertbaruch

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Re: What is this PCB vendor asking?
« Reply #5 on: January 12, 2018, 04:23:03 PM »
Hmm. I removed the soldermask from the pads, and they came back with the exact same question. I still don't know what "green oil bridge" is.

Here is what my original KiCad file looked like:



In KiCad the purple stuff is solder mask clearance. I thought that was supposed to be the area to keep the solder mask OUT of. What I don't understand is, if they're objecting to solder mask between the pins, why aren't they paying attention to the solder mask clearance?
 

Offline SeanB

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Re: What is this PCB vendor asking?
« Reply #6 on: January 12, 2018, 06:01:18 PM »
They are asking if you want tented vias?
 

Online bson

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Re: What is this PCB vendor asking?
« Reply #7 on: January 12, 2018, 07:44:47 PM »
Hmm. I removed the soldermask from the pads, and they came back with the exact same question. I still don't know what "green oil bridge" is.

Here is what my original KiCad file looked like:



In KiCad the purple stuff is solder mask clearance. I thought that was supposed to be the area to keep the solder mask OUT of. What I don't understand is, if they're objecting to solder mask between the pins, why aren't they paying attention to the solder mask clearance?
If I were to make a wild guess, they want to know if your via should still be tented so your solder doesn't drain down it, or should they honor the mask and leave it untented (I doubt they can tent half of it as shown :)).
<This space intentionally left blank>
 

Offline amyk

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Re: What is this PCB vendor asking?
« Reply #8 on: January 12, 2018, 10:04:01 PM »
It is worth asking for the Chinese sentence too, because you might be able to find a better translator (like some people here) than the one they use.

Page 20 of this shows "green oil bridge" as being "soldermask bridge": https://wenku.baidu.com/view/90f993784b73f242336c5fd0.html
 


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