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 ...
- 1,108
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 ...
- 2,360
10
votes
8
answers
12k
views
Is it ok to clip component leads after soldering?
When working with through the hole components, I have read that you should clip leads before soldering so the shock from clipping doesn't break the joint. On the other hand I've seen a ton of ...
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 ...
- 36.3k
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 ...
- 10.3k
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 ...
- 59
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 ...
- 8,561
-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 ...
- 72.5k
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,...
- 3,229
3
votes
5
answers
3k
views
How do I assemble this LM3914 bar-graph board?
I bought some of these LM3914 boards from eBay:
The ad said "buyer needs to assemble it" which I was fine with. When I opened it up I saw a board like this:
I have the LM3914 chip (DIP 18) and the ...
- 1
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 (⌀ ...
- 7,119
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?
- 169k
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