Questions tagged [stencil]
The stencil tag has no usage guidance.
32
questions
8
votes
1
answer
633
views
PCB stencil layer for cutout
I ordered a multiple PCBs which all arrived fine. I never included a stencil because of the high cost for it compared to the PCBs. Now I combined a few board designs to fit on a single stencil, so I ...
- 103
1
vote
0
answers
43
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Dual fixture ( Stencil, SMT carrier...)
I have an output upgrade project on SMT, part of which is dual fixture (2 sides BOT & TOP on the same side).
So is there anyone here with experience with this? Can u give me some advice on this?
1
vote
0
answers
167
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PCB 0402/TQFN pad design
I am currently designing a product which uses 0402 passives and other fine-pitch parts. As the PCB-space required is a major design goal I want to reduce the footprints. High production yield is also ...
- 3,509
0
votes
2
answers
212
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Soldering USB sockets and GSM module with hot air
I'm not very experienced with soldering, so I need advice.
I'm going to solder this socket - https://www.te.com/usa-en/product-2305018-2.html
How should I do this properly? I'm going use a PCB ...
6
votes
1
answer
470
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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
2
votes
2
answers
2k
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What is etched half fiducial in PCB stencil ? How to use it? [duplicate]
On pcb manufacturer website, it is possible to opt for "etched half fiducial".
Here is how it is explained :
Fiducial Mark is an alignment mark for surface mount assembly
machines.In ...
- 171
0
votes
1
answer
3k
views
What is a PCB stencil with framework?
I am ordering a PCB stencil from a manufacturer and there is an option for stencil framework. What does this mean, and should I include it? By default it is selected as no on the manufacturer's ...
- 1,263
0
votes
3
answers
1k
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Can you use a Gerber file and a PCB printer to make a stencil?
I need to solder a tiny 3 mm by 5 mm SMD. Thankfully my school has a reflow oven that can do the actual soldering part, but I still need to accurately get the solder paste on there, so I was thinking ...
- 107
1
vote
1
answer
269
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what is the pitch for vssop-8?
I recently took on a personal project that requires a vssop-8 chip:ADC081C021. In order to help me solder the pins on the pcb, I ordered a vssop-8 stencil online. But when it arrived, I found the ...
- 197
0
votes
1
answer
294
views
Hole size of BGA stencil
I need to design a stencil for reballing.
0.76 is the diameter of the ball.
What should be the size of each hole in the stencil?
I was thinking about 0.8mm. Is that correct?
2
votes
0
answers
638
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 ...
- 137
2
votes
1
answer
92
views
Is it possible to manufactrure a stencil for this paste-mask using the usual stencil making methods?
I have this footprint from the KI-CAD footprint library (LFCSP-32-1EP_5x5mm_P0.5mm_EP3.1x3.1mm_ThermalVias).
The paste-mask shows several circular paste areas under the thermal pad. The separation ...
- 12.4k
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 ...
- 459
3
votes
1
answer
61
views
SMD Stencil Material Choice
We are planning to purchase a stencil for our LED boards. This will be my first stencil purchase so I don't have much idea about a good or bad one.
The inquiries I received typically suggest two ...
- 942
1
vote
0
answers
189
views
PCB design - paste coverage calculation for exposed pad (TL;DR version?)
I have created a Web tool for creating solder mask and paste mask for exposed pad:
https://jsfiddle.net/d1wang/5t6urzwo/
The idea is get around limitation of DipTrace and help automate footprint ...
- 155