Questions tagged [solder-paste]

Solder paste is used to connect smd's to the lands on the pcb.

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Offset paste mask from pad on altium

As you can see in datasheet at page 18 of the datasheet the stencil aperture on the right has an offset of 0.1 from each side. I thought it was a typo but after contacting with sensirion they replied: ...
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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 ...
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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 ...
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Thermal pad with a via: how to deal with solder paste?

I have a TLC59283RGET part which comes in a VQFN24 housing. It has a thermal pad on the bottom. In my schematic, I have placed a via on that thermal pad, so I can route it as GND to other places. I am ...
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Solder paste and perfboard/prototype board/donut board destroying the circuit?

Does perfboard/prototype board/donut board made of paper or something (at least it's not fiberglass, that much I know) become conductive when heated to the point of becoming black? I'm assuming these ...
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Tips for placing small SMD components onto PCB

I am trying to assemble a PCB that has very small components, an example datasheet is below. I am using tweezers, microscope, and a stencil to apply the solder paste. But this is no match for shaky ...
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Determining reflow oven temperature wave and best practices

I am new to reflow soldering and am wondering the general approach for determining reflow wave setpoints. The solder paste I am using is MG chemicals data sheet and am using several decently ...
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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 ...
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Solder paste storage

Solder paste should be stored in a refrigerator and it has an expiration date. But what exactly will go wrong when it is stored at a higher temperature or past its shelf life? From what I know, solder ...
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Are soldering fluxes safe to touch?

I'm new to PCB soldering. I just bought a cheap soldering iron, solder wire and flux to try something. I have no previous experience with soldering. I'm well aware of the potential risks of prolonged ...
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Solder paste not melting or sticking

I am a rookie in this area so please excuse my language as I don't know all terms. The solder paste I am using does not either melt or stick and just looks dry when I try to solder a LED onto a MCPCB. ...
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Can I expect a solderpaste circle to reliably reflow onto a smaller circlular pad?

For various reasons, I need to pad a bit more solder paste onto a fixed-size pad, and I cannot change the stencil thickness without messing up other footprints. The pad is a 1.2mm diameter circle, and ...
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Need some tips on using hot air soldering station for my project

I and my friend have designed a 0.8mm 4 layer PCB for our project. The top and bottom layers are for signal traces and the middle layers for power and ground. All the components that we use are SMD ...
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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 ...
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How solder paste is different from tin when soldering?

I recently bought this solder paste, thinking solder paste should do the trick when not using tin wire. Did I buy the wrong solder paste or does solder paste have another function since looking at it ...
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2 answers
421 views

Going over IC max temp in reflow oven?

I'm a beginner-ish in PCB making and I want my workflow to be faster by using an oven instead of doing all the solder by hand. I searched for few hours without answer to my question. A low temperature ...
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Soldering QFP with thermal pad (but with obstructions/no vias on underside)

I will start by saying that I'm a complete newbie when it comes to soldering SMD. I've been practicing with scrap boards, and I'm getting there, but not sure how to approach this one. I am trying to ...
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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....
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How do you prevent solder paste from bleeding to nearby pads when using a solder stencil?

This is the first time I've done this but I've tried about ten times now: That particular image is of the pads for an ESP-32. It's not a perfectly representative picture because the bridging isn't ...
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25 votes
2 answers
2k views

Why are the same alloys solid in solder wire and liquid in solder paste?

Is there a chemical difference between alloys in solder wire and alloys solder paste that make solder wires solid and solder paste fluids? For instance, this solder wire and this solder paste both ...
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-1 votes
1 answer
48 views

Please recommend the tool set that fits the project [closed]

I'm looking at a few tools to make Surface Mounted Device RGB LED on a PCB. I used a heat gun yesterday for the first time. A video shows another method using a heated pad. And then yet another, more ...
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Can I remelt flux paste?

I have a container with flux paste. It is not very practical so I would like to transfer it to a syringe. Can I simply melt it by heating it (double heater with water)? It is also pointed out that ...
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What is the main factor silver in solder wire?

Previously I was using traditional soldering wire 60/40 Sn/Pb (stannous)(lead). Restriction of Hazardous Substances (RoHS) says that Pb (lead) is dangerous for environment. So we should not use lead. ...
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How to clean solder flux paste

I gave a motherboard circuit board to local a repairing professional. He traced and soldered some chips but it is not still working and advised to show motherboard to manufacturer service center. But ...
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Reflow Soldering at home

I’m trying to solder my TSSOP-16 chip to the DIP adapter. I’m planning to apply solder paste to the adapter’s pads, put the chip on the adapter and then use my kitchen oven to melt solder paste and ...
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Why are there no nichrome resistor pastes?

Nichrome wire is commonly used for wire coil heating elements. Other heating elements are formed by screen printing a pattern of "resistor paste" onto a dielectric coated substrate. These pastes are ...
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3 answers
589 views

Via in pad, reflow soldering problem

Recently I've designed a PCB for the ESP8266EX-chip. With my amount of knowledge, I thought it would be smart to stitch vias into pads. To be specific, not only the ground pad of the chip, but also ...
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1 vote
2 answers
702 views

Solder bridging when reflowing QFP

Today I attempted to reflow solder a board using a solder paste mask and a hot air station but for a QFP chip, I got a of solder bridging. This has generally been my experience with trying to solder ...
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1 answer
223 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 ...
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4 votes
1 answer
145 views

Small DFN chips come out twisted from the oven

This is a 2 x 2 mm chip with 12 no lead contact points. Half of the time I get it out of the reflow oven, it's twisted like in the image below. I am using a stencil in order to lay the paste down and ...
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How do i solder qfn package using soldering iron?

I don't have any soldering station but I need to solder the qfn package chip so how I solder it using a normal soldering iron.
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2 answers
503 views

LGA parts and hot air soldering

Does the solder pattern on these huge pads indicate what might be going on ? The parts would not work about 80% - 90% of the time. I am trying to follow the ramp_up-soak-reflow-ramp_down curve to ...
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2 answers
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Double-sided Assembly

I'm going to assemble a prototype PCB which have components on both sides. I have access to a reflow oven with profiling control, solder paste and stencils (from OSH-Park) In the reflow process for ...
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Is the solder paste file necessary for through-hole components?

I have designed a PCB. There are only through hole components on the top layer, and only surface mount components on the bottom layer. Is TOP SOLDER PASTE file necessary to send to the PCB fabricator,...
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1 answer
239 views

Transitioning to lead-free reflow and soldering

I have recently been thinking about moving to a lead-free process for my production and though I've been reading up, I was hoping someone more knowledgable than me would be able to point me in the ...
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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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2 answers
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Can aluminum solder paste be used in electronic circuits?

Is a paste like Solder-It Aluminum Solder Paste ALP-21 suited for electronics? Are there going to be any issues with the solder under constant current due to chemicals in the paste or something like ...
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2 answers
157 views

Solder paste stencil

I am ordering the stencils and I do not know if I shuld order .12 o .1 ones. There are some TQFP64 ISs and 0603 passive elements. I'd like to avoid bridges. Thank you Peter
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Thermal Paste on Cold Side of Peltier Freezing and not transferring "Heat", what gives?

I am running a peltier element, and on the cold side an aluminum heat sink to effectively spread out the cool surface to the maximum possible surface area. I just bought this new thermal paste: ...
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0 answers
124 views

Assemble a 9 * 9 * 0.05 mm steel foil and castellation PCB using standard pick and place

I have a hybrid PCB where I want to assemble a very thin steel foil on a PCB using standard pick and place SMT process. the picture below describe how the foil is like: The orange area is only hold ...
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2 votes
1 answer
2k views

Should I spray some flux on my board before putting it in the reflow oven?

I am using Tin-Lead solderpaste to make my prototype circuits. This is the exact solder paste: ALPHA OM-5100 (https://alphaassembly.com/Products/Solder-Paste/OM-5100)     ...
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2 votes
1 answer
953 views

How to clean solder paste needles?

I am looking for a good method to clean used solder paste needles immediately after usage. I know they are for one time use, but at this moment I have to clean the needles. Currently, I clean them in ...
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6 votes
2 answers
2k views

using plumber's copper solder as a "solder paste" for SMD components

Can I ? :D It is what I currently have plenty of lying around and, well... it says S-Sn97-Cu3 at composition If not, could I use regular solder wire, coat the SMT ...
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1 vote
1 answer
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Is there any risk in storing solder paste and flux in living space?

I have solder paste and flux that I regularly use. A lot of times I keep them in my drawer. The solder paste go dry and flux leaks out from the syringe. I have not thought about health risks ...
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22 votes
9 answers
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Is it important to file a new soldering iron tip before tinning?

I bought a cheap soldering iron. After reading articles and watching videos, I learnt that cheap irons get their resistor burnt easily. And many a times the iron becomes black as soon as you start ...
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5 votes
1 answer
673 views

Should mounting holes have solder bumps?

There are many discussions on if mounting holes should be plated or if they should include vias. This is not asking about those issues. I've seen suggestions to add solder to the annular ring on the ...
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7 votes
5 answers
11k views

Using a home oven for solder paste

I'm doing a project and I have a PCB which needs surface mount components attaching to it. One component has already been attached, and I have some 138deg solder paste in a syringe. This is possibly ...
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4 votes
2 answers
490 views

Good practice when designing a PCB and stencil?

While I generally use nothing smaller that SOIC chips or 0603 passive components, I have to design a PCB with a WSON-14 IC with tiny 0.5mm pin spacing and with an exposed pad. While I generally use a ...
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0 votes
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Solder paste for stencil

I'm going to solder a small pcb with reflow process and I'd like to use a stencil for that because the components are too tiny for hand soldering iron. The pcb has a QFN32 (0.5mm pitch and exposed pad)...
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3 votes
2 answers
860 views

Applying solder paste through stencil and with a machine dispenser

I am trying to apply soldering paste to a PCB using stencil but I am having issues with S-PQFP-G80 package with 0.5mm pitch. Whenever I try to apply the paste through the stencil I end up with paste ...
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