All Questions
Tagged with pcb-assembly soldering
73
questions
0
votes
1
answer
65
views
What is the best way to adapt a larger connector when the insertion holes on the PCB do not match?
Good day, everyone. I have a Type-C connector on a device that is much larger than the micro USB connector I had previously. The insertion legs do not align with the holes on the PCB, and since it is ...
- 145
4
votes
4
answers
821
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 ...
- 1,139
3
votes
1
answer
447
views
Interaction between PCB surface finish (ENIG vs HASL), wave soldering, and manual final assembly
I am developing a PCBA that is (for me, an amateur) fairly complicated: 4 layers, double-sided, mixed SMT/THT assembly. It is a fairly dense layout with ~150 total components including all the ...
- 411
4
votes
3
answers
1k
views
Is it OK to solder to large copper pour area
Is it a problem to integrate an SMD pad into a large copper pour area? In this case, the packages are 1206. I am wondering if I need to be concerned about thermal issues and interfering with standard ...
- 107
4
votes
1
answer
284
views
SMT Reflow solder quality issue with SN42/BI58 paste
I have been doing hardware design and PCBA prototyping for a while and I have issues with quality of reflow soldering. I have a small lab including a pick'n'place machine, stencil printer (eC-stencil-...
- 453
5
votes
1
answer
281
views
How does PCB manufacture work for double sided SMT assembly with BGA's?
How does a conventional board house deal with the issue of reflow during PCB component assembly with BGA's on both sides of the board?
Are two different solders used (like regular lead free SAC305 and ...
- 84.9k
0
votes
0
answers
77
views
QFN-28 REVERSE Breakout Board
I am trying to build a PCB board that I found on GitHub. In a rash we ordered few sets of the PCBs without inquiring about the parts availability. Turns out one of the parts is not available in all ...
- 109
-1
votes
1
answer
478
views
What's the best way to solder these fine pitched connectors/pins?
During a replacement of a camera mother board, I managed to screw up one of the ribbon connectors, by tearing it right where the ribbon slides into female slot. I am unable to find any replacement ...
0
votes
1
answer
512
views
Reflow soldering with temperature-sensitive components and without a reflow oven
I need to assemble and test a rather large (40x30 cm) board with single sided SMD parts, Sn Ag Cu solder (officially 217°C melting point). Usually I place group after group of components and locally ...
- 22.5k
17
votes
5
answers
3k
views
Can extra long pads cause problems?
I am a hobbyist and I find it very difficult to solder and work with SMD components which have very small underneath pads. I can't see when the solder flows, I can't touch the pads with the multimeter,...
- 299
10
votes
7
answers
4k
views
How to solder a stranded wire to a THT hole of a PCB as shock-resistant as possible
I'd like to solder several stranded wires of a cable (maximum 18 VDC) to a PCB. I've got corresponding THT holes (⌀ 0.8 mm; it's the eight holes underneath the yellow wire,) but the wire is thicker (⌀ ...
- 575
11
votes
5
answers
3k
views
Does the PCB have to be thinner than through-hole pin length?
If I have a part that has pins that are 1.2mm long. Can I use a PCB that is 1.2mm thick or does it need to be even thinner than that?
- 111
6
votes
1
answer
471
views
Why do I have shorts/bridges on QFN packages on PCBA during assembly? Stencil Printing problem
I am trying to do a home assembly of PCB but I have issues after reflow soldering. Especially I have bridges/shorts on the pins of QFN packages. I have assembled multiple boards other joins are okay ...
- 453
4
votes
1
answer
2k
views
Solder SMD on through hole
Can I just solder an SMD part directly on the through holes of the PCB?
The pitch of SMD matches the pitch of the through holes.
- 161
0
votes
1
answer
167
views
How close the soldering joint for pcb?
I am soldering a 5-12V 5-8amp max electronic to a pcb board, without a schematics. I just want to ask how far should each joint in PCB board? what I mean is for example a cathode and anode when ...
1
vote
0
answers
189
views
Do I need to alter my reflow profile for a PCB with thicker copper?
I have always been working with pretty standard 1 oz. copper PCBs and using a Controleo3 reflow oven with great success. However I am now working on boards that will potentially have 3oz or 4oz copper ...
- 1,197
0
votes
2
answers
317
views
What happens if I don't tin my DIY self-etched PCB traces?
Once I etch my PCB from copper-clad FR4, do I need to tin the board with solder?
If I do not tin the traces, what are the possible issues besides greening over time?
- 2,170
1
vote
1
answer
325
views
Via on pad for bga decoupling. Is this ok when hand soldering?
I have understood that via on pad is bad for automatic assembly processes, but can be fine for hand soldering, since it is easy to compensate for the solder that wicks into the via.
I am doing a small ...
- 13
5
votes
1
answer
1k
views
What is "activity" in solder flux?
I'm trying to select a solder flux and so many references (and one or two SE questions) discuss the types and differences. They mention "activity", such as "Rosin Activated (RA) flux ...
- 475
1
vote
0
answers
53
views
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 ...
- 327
9
votes
4
answers
3k
views
Soldering a thin spring steel wire to a PCB
Pretty noobish at electronics here. That said...
I want to attach a very thin 1080 spring steel/music wire (30 AWG or ~0.25mm) to a pcb with a thru hole, hopefully in an automated way. The choice of ...
- 103
0
votes
1
answer
78
views
Keyboard switch removal problems
I recently put together a keyboard and had an issue with a couple switches so I decided to re-solder. I resoldered 2 and that fixed the issues but for this last one I started smelling something ...
0
votes
1
answer
509
views
How to make an electrical connection to thin gold plating?
Hello fellow engineers.
I am trying to make an electrical connection with some gold plating. The gold plating is shaped like a rectangle, with dimensions of 3mm x 1.5mm x 0.1μm thick. Here is what ...
11
votes
7
answers
5k
views
Hand soldering SMD 1206 components [closed]
Because I tried to wire-solder a protoboard which failed miserable, I'm intending to order a PCB. However, to minimize the area, I want to use some SMD1206 components. I ordered some basic ones (...
- 14k
17
votes
9
answers
7k
views
How to remove this component from PCB
Anyone have any idea how I could remove this component?
I've tried blowing hot air, used solder wick, tried to poke the holes with two soldering irons, cut the pins to near the PCB, but it won't ...
- 403
6
votes
8
answers
3k
views
How can I add "standoffs" to elevate a SMD component above the PCB?
I made a mistake when creating a symbol/footprint for a small (2.0 x 1.6 mm) SMD crystal and didn't notice until the prototypes didn't work. Unfortunately, the boards are tiny and expensive (0.4 mm ...
- 17k
1
vote
0
answers
43
views
Using board-to-board pins and crimp receptacles to attach a non-board receptacle to a board
I imagine this is a bit of a stretch, but I'm working through some iterations of a cable harness for a 3D printer. I've considered that a custom PCB may be in order (still on the fence there), but the ...
- 144
7
votes
1
answer
1k
views
How to remove kapton tape from soldered parts in bulk?
I have PCBs with SMT nuts (SMTSO2060MTJ) which has been assembled onto a PCB - the nut has kapton tape on top to allow easy pickup for assembly.
However, removing the kapton post reflow is proving ...
- 462
10
votes
2
answers
3k
views
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 ...
- 934
0
votes
0
answers
446
views
Are there blank prototype PCBs with staggered edges for a DB25 connector?
Are there blank prototype PCB boards I can buy that will accept a solderable DB25 with its staggered pins?
- 2,885