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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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How to cover thermal vias in design spark pcb

I am trying to cover the vias on my PCB using the solder mask however when I upload the PCB to a manufacturer's website the vias are not covered. I am using DesignSpark PCB software There is a post in ...
James's user avatar
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1 answer
27 views

SMD connector soldermask opening size

I was reviewing the Samtec-provided KiCAD footprints for their 0.5 mm pitch LSHM connectors and noticed they completely remove the soldermask and in a strange way (note rounded corners) that suggests ...
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Is it okay for two pads F.MASK to overlap each other in Kicad

I made a new footprint for XL-0807RGBC-WS2812B based on this datasheet. When I place this footprint in PCB editor the F.Mask for the pads on this component overlaps each other. Is this okay? I assume ...
Steven Smethurst's user avatar
1 vote
1 answer
46 views

Acceptable: Polygon/zone over surface-mount (SMT) pads?

Will placing a copper polygon/zone over multiple (same-net) surface-mount (SMT) pin-pads create any thermal issues with the solder (for example, paste not sufficiently heating up)? The solder mask ...
kando's user avatar
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2 votes
2 answers
356 views

Does a BGA connector usually have bigger solder paste than the solder mask opening?

I'm designing a breakout (debug) card for the FPGA Evaluation Board VC707. For this I'm using two FMC connectors (MC-HPC-10), for footprint and design of the connector I got help from the website (...
johnny_1010's user avatar
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1 answer
41 views

IC pads showing up in the copper layer but not in the soldermask layer (EAGLE)

I am designing a PCB using the AOZ2261NQI-12 buck regulator IC. I used UltraLibrarian to grab the ECAD files like I usually do, and everything looks kosher. However, when I place the part in a design ...
InBedded16's user avatar
0 votes
3 answers
110 views

PCB solder mask to reduce magnetic field

Can a solder mask on a PCB reduce a magnetic field emitted from traces where an AC current is applied? If not, what could I do to minimalize this magnetic field emitted from a PCB? Because I know that ...
Anton's user avatar
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2 votes
1 answer
167 views

What's up with these funky solder/trace patterns?

See the annotated image below. The board takes AC power in, and feeds it to two relays (plus an empty spot where a 3rd relay could go). On the other side, it has two connections labeled ...
dave mankoff's user avatar
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135 views

Top Solder (make top solder act as positive)

I have need to manually place solder mask in a rf circuit as the dielectric of the solder mask effects signal too much. Normally this solder mask layer (top Solder) is a negative layer. Where you draw ...
abaddon's user avatar
1 vote
2 answers
67 views

VL53L0X Assembly Soldering Problem

We have a product(PCB) in mass production as using VL53L0X. There is a problem with some of our products. We tested before sending customer. There is no problem. But, over time we have received ...
FAFİ's user avatar
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1 vote
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Negative solder mask expansion not working

I am trying to adjust the solder mask expansion on a component (I can’t change the pad size because of reasons, it is a touch button). I need the solder mask to be smaller than the footprint. So I ...
aaq's user avatar
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Wheres does this PCB trace go?

I am checking a damaged engine ECU. Two traces were damaged during opening of the ECU. I put a circle around the damaged traces. I need help with the left trace. Where does it connect to?
Giannis Foulidis's user avatar
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61 views

BGA rework - Help needed

I've just started working on a PCB with BGA components (EPC GaN HEMT devices, plus BGA gate drives), and my attempts at assembly, have been quite frustrating. I'm using a heat plate (set to 150 ...
Grigoris's user avatar
2 votes
2 answers
402 views

When should I specify that top and bottom copper component pads are to be pre-tinned?

My circuit boards come from the fab house with solder pads in a pre-tinned state. Maybe I did not think to specify this - or not! Prior to reflowing should I stencil more solder or should I just ...
Peter Laidlaw's user avatar
4 votes
0 answers
176 views

Solder balls on PCB

I have produced a PCB with a thickness of 1.55 mm, using a 5 mils stencil, using SAC 305 solder (2nd reusable solder tin), a furnace peak temperature of ~235°C for all zones (normal recommended heat), ...
Jonathan Chu UHAN's user avatar
2 votes
1 answer
75 views

PCB soldermask removed in spots?

I was watching a video on Youtube, where I came across this bottom side of a PCB: source: EEVblog 1481 - Dodgy Dangerous Heater REPAIR It is seen that the soldermask is removed so they can tin the ...
Linkyyy's user avatar
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3 votes
4 answers
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How to measure distance between two pads' solder-mask clearance in Altium

I'm new to Altium and want to measure distance between two pads' solder-mask clearance using Reports-->Measure. I tried activating solder-mask layer only and then tried to measure like regular ...
Ashutosh Jha's user avatar
1 vote
1 answer
157 views

Applying bottom Soldermask layer to EAGLE board

everyone. I have a problem with one of my designed boards. I submitted my order to PCBWay for checking my files before ordering and I was informed that there is no bottom Soldermask layer. This ...
Abu Bakr Siddique's user avatar
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2 answers
229 views

Soldering MEMS sensor

I have a problem with soldering the LIS2DH12 MEMS sensor accelerometer. I searched for soldering recommendations but I do not understand exactly how to solder. I couldn't find the needed heat and ...
TA2ERR's user avatar
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4 votes
1 answer
396 views

What's going wrong with my solder paste / mask?

A short question this - I've got a board with a QFN-32 0.4mm pitch footprint, I ordered this stencil, and a tube of this solder paste, and the result is in the picture below. Now, I'm new to this, but ...
John U's user avatar
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6 votes
1 answer
2k views

Keep-out area underneath power inductor

I'm designing a DC-DC buck converter and when looking at the inductor's datasheet, I noticed an image showing a restricted area underneath the inductor, between the pads. https://www.we-online.com/...
raaymaan's user avatar
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4 votes
2 answers
1k views

Does recommended creepage distance apply to copper planes under soldermasks?

I have a design that requires around 0.5mm of creepage distance between conductors. TI said in this video that "creepage is the shortest distance between two uninsulated conductors along the ...
Never's user avatar
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2 votes
1 answer
144 views

Soldermask on copper trace damaged by heat/cold?

I have a LED-ring PCB, relatively new, that we sent through a few temperature cycle tests (-50 to +85*C), and it now shows signs of the solder-mask coming off some of the copper traces. The LEDs weren'...
evsc's user avatar
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90 views

Untented via close to ground paddle

I have designed a board and found an open (untented) via very close to a ground paddle as shown below - The via in question is DVDD12 (shown to the center-right. I am going with a stencil based ...
Board-Man's user avatar
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363 views

How to invert colors in Altium for Soldermask application

I am trying to invert black and white in Altium for the "Bottom Solder" *from this one *to look this one from https://www.youtube.com/watch?v=7ISmS7HuXSE. As it turns out, while doing ...
Brian Njenga's user avatar
0 votes
1 answer
104 views

Through-hole soldering issue [closed]

I had some hard time soldering new switches to my computer mouse, now it looks like I lost some solder pads, what shouild I do? Every other component of the PCB seems ok cuz I didnt touch it. Photos:
Ivan Tarasenko's user avatar
0 votes
1 answer
740 views

How to see the solder mask layer in Altium PCB?

Is there a way to see the solder mask layer (green coating layer) of a PCB in Altium? Is it a mechanical layer?
buttontech's user avatar
2 votes
1 answer
958 views

Using net ties for star ground in Altium

I have been experiencing issues with net ties on altium. I am trying to join my separated analog and digital grounds at a single point (star ground) and I tried creating a net tie component to act as ...
JCSB's user avatar
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1 vote
0 answers
65 views

Pads acting as heat sink for LED design

I am using traces much wider than the LED footprint to dissipate heat. What design guidelines should I follow when making design like this. Should I add solder mask expansion between anode and ...
Bavly's user avatar
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1 vote
0 answers
87 views

UV solder mask and dry film solder mask

I am interested in masking my PCBs and I have a few questions about the process: Using a dry film solder mask seems more straight-forward, but it is more expensive. If I use UV solder mask in a ...
NickG's user avatar
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0 votes
2 answers
164 views

Use of tin plating

I have been researching about PCB development, and I came across the tin plating process. Consider the following scenario: I have created a PCB, covered it with solder mask, and I am now ready to ...
NickG's user avatar
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0 votes
1 answer
579 views

Proteus thermal exposed copper (opening) for the pcb layout

I am using Proteus 8.7 and I am so confused about how to make a power plane (copper pour) exposed . I mean I want that area free from green mask so that It can make its use as thermal dissipation area....
user avatar
1 vote
2 answers
990 views

Do PCB routing vias require soldermask expansion?

Most recommendations I've come across regarding solder mask expansion state that it is required so that misalignment between the copper pad and the solder mask opening do not interfere with the solder ...
rothloup's user avatar
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9 votes
3 answers
2k views

Traces in connector's solder keep out area

I'm designing with a Molex 87438-0443 connector whose PCB footprint includes a 'solder keep out area' between each pair of copper pads for each connector lead. It appears that the manufacturer wanted ...
calcium3000's user avatar
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1 vote
3 answers
529 views

Why do older (green) PCBs have primarily a darker color, whereas new ones are lighter

Note the difference in color between this old commodore board and this newer board. It might seem like lighting, but after looking at my own collection of scrap boards, the older ones tend to have a ...
CrafterOfWorlds's user avatar
0 votes
1 answer
625 views

Solder Paste and Solder Land in Altium Designer / CircuitStudio

I am designing a footprint for the SOT765-1 using Altium CircuitStudio, and I am a bit confused regarding the solder paste and solder land definitions found on Page 3/5 of this datasheet. For the ...
Ismael Ghalimi's user avatar
0 votes
3 answers
3k 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 ...
user_fs10's user avatar
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1 vote
1 answer
368 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 ...
e11i0t23's user avatar
3 votes
3 answers
5k 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 ...
mike65535's user avatar
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4 votes
1 answer
760 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? ...
D. Patrick's user avatar
1 vote
1 answer
784 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 ...
abhiarora's user avatar
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0 votes
1 answer
834 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 ...
Hari Babu's user avatar
  • 101
4 votes
1 answer
2k 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 ...
thegrinch's user avatar
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0 votes
1 answer
957 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-...
BestQualityVacuum's user avatar
2 votes
1 answer
459 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 ...
ESD's user avatar
  • 541
0 votes
1 answer
254 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 ...
BlueSky's user avatar
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6 votes
1 answer
1k 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 ... ...
crasic's user avatar
  • 5,838
2 votes
2 answers
719 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 ...
Roman Matveev's user avatar
3 votes
2 answers
12k 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 ...
schiggn's user avatar
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2 votes
1 answer
4k 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?
Moni's user avatar
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