All Questions
Tagged with pcb-assembly components
20
questions
0
votes
2
answers
85
views
What is the best solution to keeping heavier components on a double-sided PCB while going through second pass reflow?
I am trying to do some research as I have many customers who face this issue with their parts falling off the board during the second pass. What has worked for you? Many applications are different ...
- 1
2
votes
1
answer
122
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Unknown SMD component - PCB Designation question
I have a board we are trying to repair. We are unable to get any technical documents from the manufacturer, no schematic or BOM for the board. This has multiple switches, think metal dome you press ...
- 4,501
0
votes
2
answers
95
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Why are some components missing areas of pour near mounting holes?
Circled in red are component through holes in a copper pour plane that are missing areas / don't have the copper poured completely around the via. Seen on tons of components both through hole and ...
- 3,446
1
vote
1
answer
103
views
Identifying an SMD component
It is related to the USB bus voltage in a Delta HMI that has been damaged. Is this a 2.4 V Zener diode? This component is marked with the letter D311 on the PCB.
- 5,947
0
votes
0
answers
292
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Replacement IC for SGM2212 LDO Regulator
I'm looking for a suitable replacement IC for the SGM2212-3.3XKC3G/TR found in this schematic. I've found this, which seems to be very similar and suitable for this application, but I'd like if ...
- 8,561
10
votes
8
answers
12k
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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 ...
0
votes
4
answers
193
views
Is there another component on the pcb that will extend the leg of the component?
In order to realize the event I mentioned in the picture below, I need an auxiliary component. Maybe a component where I can extend one of the holes 5 mm to the side. Or 5mm to 10mm dip adapter. Is ...
- 56.9k
4
votes
4
answers
6k
views
Is there any difference between Silicone and RTV
I've used silicone RTV that's intended for use on PCBs and have also used 100% silicone purchased from the hardware store to use on PCBs. I was not able to tell a difference between the two. ...
- 8,988
3
votes
1
answer
369
views
How do I find the center of a part when making a footprint for a component that will be used in a centroid file?
Often the footprint I need is not in the existing libraries and I need to make my own. For example one of the dozens of micro USB footprints.
When I make a footprint and then send for assembly at ...
- 1,092
-1
votes
3
answers
156
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Assortment of electrical component for beginner [closed]
As a newbie in electronics when building projects with Arduino, sensors etc. on PCB I often have a problem with electrical components like capacitor, resistor, diodes, switches etc. For different ...
- 2,360
9
votes
2
answers
1k
views
Identifying weird component on PCB
In optical LIN converter PCB there is a weird element glued:
A plastic ring with resin/ plastic fulfillment.
Is it some sort of local coating or chip-on-board encapsulation?
There are no elements in ...
- 885
11
votes
3
answers
3k
views
Can I assume counterfeit components?
I recently received a run of 10 PCBs from a manufacturer in China, and am worried they have begun to cut corners and source counterfeit parts. Here is why:
I had them do full turnkey production (PCB ...
8
votes
1
answer
2k
views
Centroid of component for pick and place machine using Eagle
Just finished designing a PCB and sent the Gerbers off to my board house (Bittele) and they have requested that I also provide them with a pick and place file.
Using Eagle, I ran mountsmd.ulp and ...
- 576
3
votes
1
answer
147
views
Why do some components have their through-hole pins flattened/pressed near the housing?
Some components as depicted in the below picture have different shape in their pins.
I wonder to know is it because the manufacturer wants to tell us from where should we assemble it in the board ?
- 1,266
3
votes
2
answers
653
views
Moisture Senstive Devices - Shelf Life
I have a bag of DAC7512N digital to analog converter from TI. They are still sealed in the original packing, however the caution notes denote "calculated shelf life in sealed bag: 24 months" and the ...
