Questions tagged [solder-mask]

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.

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64 views

How to remove solder mask in Eagle

I want to remove solder mask in particular area for mount a TO220 package. As shown in below image I want to mount the 7805 using a M3 nut and need to remove solder mask only in covering area. (like ...
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1answer
73 views

PCB Solder Mask textures

In the example image below the pcb is shown to have a textured honeycomb like mesh texture on the solder mask. My question is how would one go about creating a textured finish to the PCB like seen in ...
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3answers
133 views

Why some vias have solder mask and others do not?

Here's an area of a commercial PCB. I'd like to know if the "missing" solder mask is a deliberate choice made by the PCB designer, and if so, why? edit: changed graphic to highlight representative ...
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1answer
237 views

Why did KiCad merge my pins into one open blob in the solder mask gerber?

I designed a PCB with an IC that has a pitch of 0.5. The footprint solder mask looks like this: However, the gerber came out with one blob that looks like this: Why did it do that? Can I stop it? ...
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1answer
141 views

Keepout in Solder Mask in Altium 17 for SD Card Connector

I am creating footprint for Amphenol's SD Card Connector in Altium Designer 17. The datasheet shows ...
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1answer
85 views

soldermask top for non plated holes

I am here to clarify doubt on soldermask for non plated holes. I know soldermask is used to protect board from oxidation and prevention of solder bridges and accurate placement of components to be ...
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1answer
284 views

Can Silkscreen Go Directly Onto Copper PCB Layer? (No SolderMask)

Hi I am wondering if a PCB silkscreen layer can be printed directly onto a copper layer without a solder mask. I don't see this often but I have a design for which this would be useful. Has anyone ...
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1answer
212 views

Vias in between BGA Pads

I'm designing a 4-layer board with BGA components. The BGA part I'm working with, the SensL MicroFJ-60035 TSV, is a BGA SiPM with its pads in a 6mm by 6mm square layout. Most of the pads are no-...
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1answer
139 views

Missing soldermask on some pads of mcu

After designing a board in Kicad with an SMT32L0 on it, I sent it to seeedStudio and when I received it, I noticed that some of the pads on the stm32 are missing soldermask: I checked the gerber file ...
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1answer
55 views

Solder Pad and Stencil Mask Data Sheet - Confused

I am using Autodesk Eagle. Need to create a footprint for CREE LED XHBAWT which is in the XLAMP XH-B series. I do not understand the Datasheet drawing of the footprint, attached. Are the lower views ...
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1answer
319 views

What impact, if any, does the solder mask color have on the electrical and mechanical properties of a PCB

At my place of work, we use soldermask colors as a sort of poke-yoke for manufacturing purposes E.g. Technicians know that green pcb goes with green, blue pcb with blue, etc. This has lead to some ... ...
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2answers
309 views

Is it OK to put traces under castellated PCB

If we would speak in general: what is the strength of the solder mask in terms of breaking voltage? So if we put one PCB with castellated pads on another board like this: What will heppen if both ...
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2k views

Acceptable Silk to Solder Mask Clearence

I am running DRC in Altium Designer and Im getting tons of "Silk to Solder Mask Clearence" Errors. I searched for acceptable values, but without luck. Altium is set to 10mil. I have most values around ...
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1answer
895 views

How to make untented vias in KiCad?

Is it possible to make some selected via's exposed in KiCad? Although the option "Do not tent vias" is helpful but it is a global setting. Is there any option so that some vias will be left unmasked?
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4k views

Super glue as solder mask?

Wondering if super glue could be safely used on a PCB to cover exposed traces or jumper wires. I know it’s non conductive but is there any type of damage that could occur? I normally use green ...
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1answer
4k views

Minimum solder mask sliver

I am new to PCB design, and especially on Altium. I am trying out it and have no clue of the best way to fix the following error: I am trying to build a PCB for a Li-Ion charging circuit based on ...
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2answers
312 views

Inconsistent solder mask on vias

When looking at PCBs in consumer products or PCBs I have ordered from manufacturers myself, I notice that, while many of the vias are covered in soldermask, it seems like a few random vias are missing ...
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4answers
2k views

UV solder mask sticking to cover instead of PCB

I'm doing the usual DIY PCB process. Lately I got some of the chinese UV solder mask (similar to the one used in this video). I can work with it just fine - it sets under my UV lamp perfectly, within ...
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1answer
3k views

I inhaled some solder fumes for a bit of time [closed]

I inhaled some solder fumes while attempting a project last week, and I haven't stopped coughing since. It's getting rather irritating. However, I should mention that prior to my experiment, I had a ...
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2answers
356 views

RTV silicone as solder resist

can moulding RTV silicone be used as a solder resist? note that this silicone is made for casting low melt alloys/metals.
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769 views

How to make soldermask on PCBs for soldering?

I know how to do a PCB until this step (below image) ugly and not safe by short-circuits. I found this PCB Plating Tape on Aliexpress (Link to the aliexpress product. I'm not the seller) which I ...
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2answers
233 views

Altium: i-dots in soldermask layer disappear in Gerber

I have my email address embedded in the soldermask layer. When checking the generated Gerber data, the dots on all the "i"s are missing. How did that happen?
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Do 0402 chip component need solder mask web between the pads?

In my board, all 0402 parts are using gang solder mask. The pad to pad distance is 10 mils. Is there any risk of solder short? Do I need to suggest applying solder mask web between the pads for all ...
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1answer
321 views

Can spray paint or a marker block UV for solder mask/resist? [duplicate]

I am planning to make a PCB and putting solder mask on it but I don't have my own laser printer to print the transparency for the mask. I do, however, live near a printing shop with a laser printer ...
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1answer
519 views

solder mask clearance [closed]

The current soldermask clearance in GERBER is 3 mils. Will PCB house reduce it base on their capabilities? I'm a fresh DFM engineer in an EMS company. Soldermask analysis is a part of DFM, changes of ...
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1answer
363 views

What's the min space between exposed via pad to exposed component pad during reflow?

In my opinion, the solder will not run into the via as long as there is a reliable soldermask web between them. Is that right? As I know, PCB manufacturers change gerbers all the time to make the ...
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2answers
923 views

Is solder mask expansion overlap legal?

I used the component wizard in Altium to automatically create a footprint but it decided to overlap the solder mask expansion with neighboring pads. Is this ok or should I change it such that there is ...
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1answer
512 views

Questions about Solder Mask Expansion Rules and Passive design in Altium

I am working on my first Systems project as a student and I am learning how to integrate chips as I go along in Altium. I recently came across this question in which you provided a rule for ...
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2answers
906 views

Missing top solder mask complaint when trying to order PCB? (PCBWay)

I'm really new to PCB layout and after creating my PCB layout and ordering it from PCB Way my audit was failed for reason "no top solder mask layer." What does that mean and how would I add that? If ...
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2answers
1k views

Why would metal from a pad be *underneath* the solder mask in a footprint specification?

One of TI's new regulators has a rather unusual footprint, with several pads (7-13 in this instance) requiring that the pad metal extend under the solder mask. This is in contrast to the usual case ...
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3answers
3k views

What is a “solder mask opening” in a footprint?

In the Luxeon LED datasheet under Solder Pad Design section there is a diagram with 3 crosses around the edges of the LED. They are identified as "4x Soldermask Opening (hatched area)" but I am not ...
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92 views

Why is green the default solder mask color? [duplicate]

Solder masks can be had in many different colors. I have personally gotten white, black, red, and blue. But green is, by far, the most prevalent color on printed circuit boards, and the default at ...
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1answer
304 views

PCB solder mask inconsistency

We have a small PCB that has been manufactured and assembled several thousand times. However, the last lot showed inconsistencies with the solder mask: It looks like the solder mask is very thin, ...
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1answer
232 views

Optional feature in PCB layout of MMCX board edge connector. What's it for?

I'm designing a circuit requiring MMCX board edge connectors, specifically using the Molex 73415-0961 jack. When looking through the datasheet for suggested PCB layout, I see mention of an additional ...
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0answers
400 views

Problem isolating vias. Solder mask offset

I detected a shortcircuit between two vias in one of our PCBs. The shortcircuit was caused because an offset on the solder mask leaves part of the via's ring "half opened". When the PCB was assembled, ...
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2answers
714 views

Text inside shape in Eagle

Is it possible to make text inside a shape on the silkscreen layer in Eagle? I'd like a white rectangle with text inside that's the color of the solder mask. (I see this post but not sure if I can do ...
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2answers
2k views

Altium Designer, Solder mask layer

I designed my first PCB and had it manufactured, but there was no solder mask on the manufactured PCB. Is there a specific setting that i need make in order to enable the solder mask layer? I am using ...
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1answer
759 views

Solder mask custom shape in altium

I want to have a region in my PCB without solder mask while the other regions should have solder mask. I am not sure how do I do it in Altium? To be precise I want say a custom shape solder mask free ...
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1answer
483 views

Solder mask free regions on PCB

I have noticed many PCBs with solder mask free regions/areas on the edges. I am attaching an image with this. What is the purpose of such areas ? What I can think of is heat transfer to the ambient ...
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2answers
5k views

Eagle - non solder mask defined (NSMD) pads

I am designing a PCB layout in Eagle and in the datasheet of my modul it is said that "Non solder mask defined (NSMD) type is recommended for the solder pads on the PCB". Does it mean that there will ...
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1answer
206 views

Coating a soldered connection on a small circuit board

I have a small PCB, about the size of a quarter and having a Bluetooth chip on it. I have 4 wires soldered to the board. 2 of which are for a 3.7 Volt battery connection and 2 are to connect a small ...
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0answers
1k views

How to remove silk screen from PCB?

Last batch of PBCs I got from a manufacturer had some silk screen splashes (dots) all over the board ruining the design. I don't have and don't want to have any silk screen on the board. The whole ...
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1answer
859 views

Should there be solder mask under this QFN-16 chip?

The layout for a QFN-16 packaged chip (FXOS8700CQ) I am using is shown below. I'm confused about the solder mask opening. Should it be everywhere inside the green outline or just rectangles around ...
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2answers
1k views

Soldermask impact to guard-ring circuit

Guard-ring circuit is designed aroung high sensitive (low current high impedance inputs). What is the technical impact if a guard-ring circutry is fully masked versus unmask ?
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1k views

Strange Solder Spots on PCB

I was tearing down some old CD drives and while taking a look to the PCB I found two pointy solder spots, connected to the first pin of each side of a chip which makes me think is an EEPROM. There ...
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1answer
1k views

Solder Masking Ink

I am trying to make a complete PCB with solder masking and silk screening, for creating a small PCB fabrication house of my own later. I choose the process of screen printing for fabricating my pcb, ...
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1answer
891 views

Solder mask for 0.5mm pitch TQFP

I'm using Atmel SAM chips and the data sheets don't have any mention of solder mask clearance for their TQFP packages. What would be a nominal pad/solder mask opening/cream size for a 0.5mm pitch ...
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2answers
8k views

Gerber - is my understanding of solder mask layer (GTS / GBS) correct?

I've just had a PCB manufactured for me, but it seems like the solder mask is only applied to where the copper is. I'm trying to figure out if it's my fault or not. According to my understanding ...
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1answer
583 views

Solder stop mask and tinning sequence

Is it recommended to tin PCBs before applying solder stop mask or should I apply the solder stop mask to the PCB and then apply the tinning? Would tinning before applying the solder stop mask be ...
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6answers
10k views

How to remove solder mask?

I'd like to reuse a PCB in non-intended way and I have to remove the green solder mask to expose the copper traces in 1 x 3 cm area. Is there any safe method to do it without damaging the traces? I'...