All Questions
Tagged with pcb-assembly pcb-design
173
questions
3
votes
2
answers
380
views
Can I leave a throughole pad off one side of a machine-fabricated PCB?
So I'm designing a two-layer PCB and I'm very inexperienced. A third-party company will fabricate them.
Now, I have a PTH part with a number of closely spaced pins (and there is no SMD equivalent of ...
- 663
0
votes
2
answers
1k
views
Soldering wire directly to a PCB through hole vias, what is acceptable proximity tolerance?
The wire gauge is 16 AWG. The hole size is 63 mil, and the overall via diameter is 98.5 mil.
What is the minimum spacing between two of these for voltage levels of 0-12V and 0-160V circuits?
I think I ...
user298907
8
votes
2
answers
3k
views
How do PCB manufacturers know how to orient polarized components?
Let's say I have diode or a polarized capacitor in my circuit.
How do PCB manufacturers know how to orient the part on the PCB?
When I create the part in Altium for example, I just make up which pin ...
- 868
0
votes
1
answer
2k
views
Thermal vias-in-pad - leave bottom side tented or exposed?
What is the suggestion for thermal vias under the exposed pad of ICs ? I understand that copper plugging would be ideal. But if I only have the choice of tenting or not tenting, should I leave the ...
- 22.5k
1
vote
2
answers
578
views
0805 package SMT pads minimum clearance and tombstoning
The picture shows 0805 LEDs and one last 0805 resistor connected to the GND pour.
What is the minimum clearance between the SMT pads of the different 0805 LEDs that I should consider safe for ...
- 333
0
votes
1
answer
131
views
My PCB design doesn't work when put together
I created the PCB based on the schematic shown below. I ordered the PCB shown below that I designed and I connected up. After I soldered all my parts into it and connected a 9V battery, nothing ...
- 11
0
votes
1
answer
143
views
I2C interface frozen until reflowed again
I have custom PCB with nRF52832 MCU and two I2C devices sharing same bus, IAM20380 on 0x68 and IAM20381 on 0x69.
All works fine, but after a few hours of testing I2C interface freezes when I2C command ...
- 23
0
votes
1
answer
192
views
Using ground plane between components on top and bottom layer
I’ve recently been reviewing some PCB designs to learn good practices.
One thing I’ve seen is that a ground plane is used on top layer between the components and traces.
Is this a good practice and ...
- 65
0
votes
2
answers
314
views
TMUX1119 SC70 package first pin identification
I have a TMUX1119 with an SC70 package.
The datasheet says there is a dot near the first pin. The actual device that was received is shown below. I can see a line and below it is written 1DF.
Which is ...
- 2,593
1
vote
2
answers
457
views
Recreating Arduino UNO - PCB design (How are the components connected?)
I'm trying to recreate the Arduino UNO in order to be good at PCB design via EasyEDA or Altium. I have recreated the Arduino Uno schematic and design but it is hard for me to figure out few things (...
0
votes
3
answers
456
views
How does the number of PCB layers affect the temperature of the board?
I understand that a PCB with the exact same circuit on a 2-layer board will get hotter than a higher number board: 4-,6-,8-layer boards. But, I have not been able to find the reasoning for this ...
1
vote
0
answers
87
views
Layer thickness design for 4-layer boards
I'm designing a 4-layer PCB, containing a GPS module (u-blox NEO M9N) and a Taoglas antenna. The GPS antenna should be on the top layer, and the GPS receiver should be on the bottom layer.
Besides the ...
- 135
2
votes
2
answers
164
views
What to do with a missing common pin for a DC DC module on a PCB?
I made a big mistake while designing a board and it was printed out with 4 pins for the MDD02L-05 instead of 5.
What can I do with the common pin on the isolated converter?
I think folding the pin is ...
- 49
1
vote
1
answer
2k
views
KiCad clearance vs JLCPCB clearance
From [JLCPCB][1] it lists many type of clearances.
However in KiCad, it only lists one type of clearance, and I don't know what it is.
0.5mm is the highest value for clearance in JLCPCB and in KiCad ...
0
votes
1
answer
748
views
Clearance between SMD components
I'm designing a compact PCB.
It consists of non-addressable 5050 RGB LEDs.
I'm concerned about how close they are. I'm going to use the SMD assembly service provided by JLCPLB.
Should I change the ...
- 53