All Questions
Tagged with pcb-assembly surface-mount
57
questions
33
votes
6
answers
7k
views
SMD soldering: tiny components stick to tweezer point
When soldering SMD components, the 2-pinned ones (like resistors, capacitors, ...) are the hardest in my opinion.
I started long time ago with the 1206 format. Then scaled down to 0804, 0603 and ...
- 2,369
3
votes
2
answers
1k
views
Stencil at home with extremely small parts?
I was amazed lately to find out about solder paste - so we can assemble our PCB prototypes at home relatively easily.
The process seems easy, but now I started to suspect I am going to have a problem ...
0
votes
2
answers
1k
views
Small 'blistering' under surface-mount soldering attempt - is this a problem?
I am very new to SMT soldering - and have started with a small project.
I used resin flux, followed by a small amount of solder paste and then a hot air gun at around 373 degress celcius to flow the ...
- 454
5
votes
1
answer
205
views
What is the purpose of irregularly shaped SMD pads?
Looking at a this buttons recommended footprint, I found these irregularly shaped pads:
The protrusions from the pads are way to small to act as solder thieves, and the button itself has gull wing ...
- 671
24
votes
4
answers
3k
views
Why are there no BGA chips with triangular tessellation of circular pads (a "hexagonal grid")?
Ball grid arrays are advantageous integrated circuit packages when a high interconnect density and/or low parasitic inductance is paramount. However, they all use a rectangular grid.
A triangular ...
- 8,661
2
votes
2
answers
1k
views
Searching for exotic SOT23 P-channel mosfet where source drain swapped
Due to an error in the layouting process a batch of PCBs has to be scrapped. Instead of the standard pin assignments:
1 - Gate
2 - Source
3 - Drain
we used:
1 - Gate
2 - Drain
3 - Source
As a last ...
- 23
5
votes
7
answers
5k
views
Why are there no easy-to-solder SMD diodes in 0603 packages?
What seem to be the most popular SMD diodes currently come in SC-79 packages, but they super tiny and really hard to hand solder...
...and they also can be a hassle even for reflow.
So I thought I'...
- 10.2k
1
vote
2
answers
282
views
How to determine which size of surface mount resistor for an ADMP441
I'm relatively new to reflow surface mount soldering and am unfamiliar with the various sizes of components.
The PCB design I ordered is here:
https://oshpark.com/shared_projects/ypqAU3CH
But I ...
1
vote
3
answers
115
views
how to get a breakout made for module that doesn't have one?
I'm just starting out in this field and I got ideas for projects I want to build but I'm running into problems, not so much with how to find the part I want or how to get it to work. but how to ...
- 113
1
vote
1
answer
182
views
Can anyone indetify this SMD component?
This is from N9005 phone and i would love to know what SMD component is this. Here is a photo. Thank]1
- 13
1
vote
1
answer
311
views
Pastemask. Manufacturing PCBs
after finishing some designs, it is time to manufacture and assemble them.
For making these designs I have to create all padstacks, footprints, etc from scratch, so I took PCB Editor examples as ...
- 367
1
vote
1
answer
255
views
SMT reel: taking a couple of parts off the reel
I have a couple of SMT parts that I ordered "digireels" for - i.e., essentially tapes wound around a spool, with some leader tape attached at the front. This is good for the pick and place machine - ...
- 443
4
votes
5
answers
19k
views
Eagle - export pick & place file
How do I export/generate an pick & place file for my board in CadSoft Eagle?
Is there a standard (like gerber) for pick & place machine files?
- 1,038
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
3
votes
1
answer
1k
views
Is there a pitch limit to applying solder paste through a PCB stencil by hand?
I've ordered two stencils from two different companies, two different materials. Both times I've been completely unable to effectively apply solder paste to the pads of a QFP-64. I end up with a mess ...
- 17.6k