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Questions tagged [solder-paste]

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

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PCB footprint design for minimum solder use [closed]

Are there any studies that show how to design a footprint for minimum solder use? I'm looking at an application where many millions of solder points per day will be running. Obviously there's a ...
user103218's user avatar
4 votes
4 answers
814 views

Are there any techniques for soldering USB-C 16 pin?

I am trying to solder Type-C SMD USB connectors but I can't do it properly. Despite using an SMT stencil for soldering, each time I am having an issue and I can not solder it properly. Sometimes pins ...
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Altium Top Paste not fully poured

In the picture below, Top Paste's 3 of 4 FETs is not poured well. I can't see the reason for this. Any suggestions?
MSB's user avatar
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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
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Soldering with SAC on a glass PCB

I’m having trouble getting the solder paste to wet my glass PCBs. I am using SAC305 solder. Funny that it works fine on FR-4 but with glass it just balls up. Maybe it is because glass conducts heat ...
Eitan Benchabbat's user avatar
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0 answers
47 views

Solder Wave Residue

Issue: 1-3 days after maintenance, chunks of solder residue starts to show in the solder wave bath. This creates blockage in the nozzle. Any notes how to solve this problem? Notes: No new chemicals ...
l-Inġinier's user avatar
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1 answer
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Soldering paste for SMD on a laptop motherboard

I want replace a SOIC8 SMD EEPROM on my laptop's motherboard. I have both a hot air gun and a soldering iron. I bought tin-bismuth soldering paste (Tin 42% - Bismuth 58%), but then I saw on most SMD ...
servabat's user avatar
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Identical component on both sides of PCB with vias in ground pad

I have a dual analog output PCBA that I am routing. The analog output component selected is two TI DAC7750IRHAR DACs. These DACs are controlled via SPI lines. I had originally intended to place both ...
rothloup's user avatar
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3 votes
0 answers
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How is this USB connector supposed to be soldered

I'm using this USB-C connector in a project but could not figure out how it should be soldered to the PCB. I could not figure it out from the datasheet either. It says it is an SMT component - does ...
Blims's user avatar
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1 answer
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How to solder stainless steel electrode to PCB pad?

My goal is to solder stainless steel electrodes to a PCB in order to make a device that can measure differential voltage measurements from a surface. How do I attach stainless steel to a PCB to create ...
dinoswords's user avatar
1 vote
2 answers
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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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How dangerous is soldering lead gas? [duplicate]

I get exposed to the gas of solder lead and/or flux all the time when I solder. How dangerous is it? Should I avoid it at all costs or it's not of a big deal as people think?
Yağız Alp Ersoy's user avatar
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How to save on solder paste usage on the SMT line?

We are using about 500g of solder (enough to scan solder) on 1 line and only reuse it for the 2nd time (cannot use the 3rd time) and then discard the used solder. The problem is that the amount of ...
Jonathan Chu UHAN's user avatar
2 votes
3 answers
610 views

Is there a rule of thumb or an IPC standard for reducing (windowing) solder paste deposition on exposed pads?

I am creating a footprint for a 24-pin QFN package with exposed thermal pad. Sometimes manufacturers will provide solder paste mask guidelines in addition to metallization for the landing pattern, but ...
JYelton's user avatar
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Is dry or drying solder paste effective on a circuit board

My circuit board has some 80 components. I'm in prototype stage, that is: stenciling with solder paste, placing parts and hot plate soldering. I see that by the time I get to placing the 80th part, ...
Peter Laidlaw's user avatar
1 vote
2 answers
141 views

What are the practical differences between solder balls and spherical tin powder?

Solder balls are made of tin, with small amounts of silver and copper. The minimum size of solder balls is limited. Nano spherical tin powder is available in smaller particle sizes. If such a tin ...
EddieP's user avatar
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4 votes
1 answer
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Solder reflow pure nickel strip to PCB ENIG pads

I've arranged for a custom shaped strip of pure nickel that I intend to solder to ENIG pads on a PCB using reflow/paste. Will we have problems getting the solder to adhere to the nickel? Is there a ...
Dan's user avatar
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1 answer
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SMD pad size for custom component

I'm trying to reflow a custom shaped strip onto a PCB, but I'm unsure about what size pad I need on the PCB. The strip is 13mm x 6mm x 0.3mm. The PCB surface finish is ENIG. The pad is likely to be ...
Dan's user avatar
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2 answers
228 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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1 answer
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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 ...
John U's user avatar
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1 vote
1 answer
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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 ...
Bram's user avatar
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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 ...
user avatar
1 vote
1 answer
406 views

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 ...
Feynman137's user avatar
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384 views

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 ...
Feynman137's user avatar
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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 ...
Board-Man's user avatar
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10 votes
2 answers
3k views

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 ...
Jiří Maier's user avatar
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4 votes
1 answer
3k views

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 ...
John's user avatar
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2 answers
1k views

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. ...
noxious's user avatar
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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 ...
Conor Patrick's user avatar
0 votes
1 answer
1k views

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 ...
Dada Kräuter's user avatar
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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0 votes
2 answers
868 views

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 ...
Pieter Dubbel's user avatar
3 votes
2 answers
2k 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 ...
s.1.618's user avatar
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0 votes
0 answers
303 views

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 ...
mlotito's user avatar
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
2 votes
0 answers
639 views

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 ...
user875234's user avatar
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 ...
Ken Grimes's user avatar
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-1 votes
1 answer
49 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 ...
listenlight's user avatar
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0 answers
67 views

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 ...
FarO's user avatar
  • 1,316
1 vote
1 answer
355 views

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. ...
mehmet's user avatar
  • 1,139
0 votes
3 answers
2k views

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 ...
Androidquery's user avatar
0 votes
2 answers
3k views

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 ...
beginner's user avatar
  • 105
1 vote
1 answer
417 views

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 ...
EddieP's user avatar
  • 273
2 votes
3 answers
1k 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 ...
Zunzulla alagaty's user avatar
3 votes
4 answers
2k 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 ...
Emil Eriksson's user avatar
0 votes
1 answer
621 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
4 votes
1 answer
183 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 ...
kellogs's user avatar
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1 vote
2 answers
2k views

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.
Black Pearl's user avatar
2 votes
2 answers
968 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 ...
kellogs's user avatar
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