All Questions
Tagged with pcb-assembly reflow
14
questions
0
votes
2
answers
253
views
PCB warping during Reflow
I have design a PCB size about 100x60mm it reflow very nice on the hot plate but If I convert my PCB to a panelization 2x3 quantities size became 200x180, the edges began to lift up due to expansion ...
- 1,139
4
votes
1
answer
275
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
4
votes
1
answer
414
views
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 ...
- 133
0
votes
1
answer
127
views
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 ...
- 133
2
votes
3
answers
809
views
How do I get pin headers to reflow flat to the board?
I work for a small company as an apprentice. We build mostly mass produce double sided PCBs. We are having trouble keeping the pin headers flat to the PCB through the reflow oven process.
The first ...
- 21
1
vote
2
answers
244
views
Do I need to re-reflow this board?
I had given a few boards for manufacturing and this is how they’ve come back from the fab. Do I need to reflow these again? Would it be safe to do so? I checked and the pins are not shorted but what ...
- 1,340
1
vote
0
answers
188
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
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
6
votes
1
answer
1k
views
Rule of thumb for surface tension when placing components on the secondary side of a board
I've been working on my first multi-layer PCB design, and have been placing a variety of components on the secondary side of the board (mostly decoupling capacitors and QFN ICs). However, some of ...
- 1,311
8
votes
2
answers
849
views
Why do the Sparkfun and Adafruit Eagle libraries use smaller footprints than the manufacturer's recommended land pattern?
I'm comparing two datasheets from Micron and Infineon to the Sparkfun and Adafruit footprints for TSSOP-28
Both the footprints use an SMD pad size of 1.0x0.3 mm, while the manufacturers recommend ...
- 329
8
votes
1
answer
2k
views
Solder paste stencil application
I am trying to do reflow soldering with a stencil for the first time. I have done some reflow soldering before, but every time I manually applied the paste using a small syringe + needle. These ...
- 135
0
votes
2
answers
258
views
Is airbath + air gun reflow appropriate for low-volume commercial production?
I understand there are a number of ways of reflowing individual SMT boards. I've seen small temperature profile ovens, hotplates, skillets, airbaths, and hot air guns used. I'm trying to determine ...
- 17.6k
12
votes
3
answers
6k
views
Soldering heatsink pad on bottom of IC
I am attempting to make a board for the tlc5951 24-channel led driver to drive an 8x8 rgb led array. I have made what I think is a good eagle library for the sop-38 package, but I am not sure what to ...
- 2,054
7
votes
3
answers
5k
views
Is it advisable to use lead-free PCB and solder paste on a first SMD assembly job?
I am sending my first PCB design to Sunstone for manufacture and I need to decide whether to order the board finish lead-free. All of the components are lead-free, and I have not decided on solder ...
- 385