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Results tagged with solder-mask
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user 35530
The traditionally green coating which protects copper on PCBs from oxidation and shorting due to solder. Use this tag for PCB design questions and soldering questions which require attention to the mask layer.
5
votes
Use of tin plating
If you solder it immediately there is no need for any kind of coating. Normally there can be some delay between PCB manufacture and assembly so a coating of some kind is used.
Possibilities include ni …
2
votes
Accepted
Solder Masking Ink
Edit: You're using screen printing emulsion not the proper ink- it's usually pretty resistant to solvents, at least the industrial stuff is. There are some wimpy low-VOA products designed for the T-sh …
1
vote
Accepted
How to see the solder mask layer in Altium PCB?
It's called "T-Solder" (top) and "B-Solder" (bottom) by default, and you can toggle visibility like any other layer. They're not mechanical layers, they're signal layer pairs, so when you flip a compo …
1
vote
soldermask top for non plated holes
For unplated holes it is better to pull back the solder mask by about 5-10 mils (assuming no pads) around the hole.
If there are pads (for example, for a mounting hole) you should pull back the sold …
4
votes
Accepted
Solder Pad and Stencil Mask Data Sheet - Confused
Yes they are rotated.
The "Stencil Mask" is a physical metal stencil created to be used by the assembly house to print solder paste. The grid reduces the solder coverage to the typical 70% or so for …
1
vote
Is solder mask expansion overlap legal?
It's fine, and when the pads are closer together than the manufacturing process can handle (the sliver between pads disappears or becomes too narrow to meet capabilities) there is no other way. Especi …
7
votes
Accepted
Gerber - is my understanding of solder mask layer (GTS / GBS) correct?
That looks correct.
Whether it's your fault or not depends on what you told the manufacturer the file names represent- the names in your title are standard for Altium, but other EDA software uses di …
4
votes
Altium: i-dots in soldermask layer disappear in Gerber
I can confirm that the problem exists.
Changing the font to Truetype can avoid the issue.
Maybe you should open a ticket with Altium support.
2
votes
Why some vias have solder mask and others do not?
Yes, it's a choice in most PCB design software.
It might be a default choice or it might be a deliberate choice, you'd have to ask the designer.
Sometimes vias double as test points (in which case …
2
votes
Accepted
Solder Mask Expansion Rules and Passive design in Altium
Use the IPC wizard to design the footprints from the device dimensions and tolerances. QFN and discretes are definitely covered, DFN may not be, at least in older versions.
You should take into acco …
1
vote
How to invert colors in Altium for Soldermask application
Use the Film Wizard, under Tools. Select "invert".
3
votes
How to measure distance between two pads' solder-mask clearance in Altium
Another non-ideal approach is to set the design rule for solder mask sliver to something large such as 0.5mm and then run design rule check.
Right click on an offending pad will give you Altium's take …
3
votes
Accepted
PCB layout guidelines Magnetic Sensor
Regarding the PCB finish, you can use HASL (lead-free or not) or OPC, but not ENIG.
ENIG (Electroless Nickel Immersion Gold) sometimes just called "gold flash" has a nickel barrier layer, and nickel i …