All Questions
9
questions
1
vote
1
answer
301
views
Soldermask bridge gap too small - PCBWAY
I've got a PCB design which contains a chip that uses the QFN (7x7) package.
Because of the package size the pins are very close together and the pads are 0.2mm apart, which is smaller than the ...
- 131
0
votes
2
answers
99
views
If a PCB is inspected to an IPC-A-600 class higher than specified what are the negative impacts?
I have received several parts from a PCB manufacturer which should have been inspected to IPC-A-600 Class 2 but were instead inspected to IPC-A-600 Class 3.
I believe I have received PCBs inspected to ...
- 77
1
vote
4
answers
378
views
Choosing a PCB Manufacturer/Assembler for the first time [closed]
I've just finished designing my first PCB, and I'm about to send out a batch of emails for quotes from manufacturing/assembly shops. My design is super simple: the only components are 7 identical SMD ...
- 303
0
votes
1
answer
2k
views
Half-etched fiducials Vs through-cut fiducials
While making PCB, I added 8 fiducials (fids) marks so that pick and place machines use these marks as referent points on the PCB to position the surface mount components (Packages) during assembly.
...
9
votes
3
answers
2k
views
Anyone know the premise of this PCB assembly note?
The assembly note states:
Bake bare PCBs in a clean and well ventilated oven prior to assembly at 125*C for 24 hours.
Why is this necessary?
- 312
2
votes
2
answers
216
views
Connectors in high volume manufacturing?
How are connectors such as USB handled in high volume manufacture?
Would the panelized board leave room to place these connectors or would the panel be cut apart and the connectors added later. Is ...
- 7,137
1
vote
2
answers
177
views
Nomenclature for tested PCB assemblies
I want to unambiguously refer to an assembled PCB that has been tested. I am familiar with the terms:
PCB - unpopulated printed circuit board
PCBA - PCB assembly, a PCB with all the parts fitted and ...
- 4,172
4
votes
1
answer
1k
views
From what pitch should I consider ENIG finish
My design (4-layer, FR4, 1.6mm) has a couple of ICs with 0.5mm pitch pads and some LEDs with 0.4mm pitch pads, very small LEDs.
Should I consider ENIG (more expensive) or will HASL do the job?
I read ...
- 2,127
6
votes
1
answer
848
views
How do PCB fabrication houses make PCBs?
I know the different ways of making PCBs at home, but I can't seem to find a lot of information on how board houses professionally make their PCBs. Is this how they do it?: http://www.youtube.com/...
- 4,546