Questions tagged [pcb-assembly]
The process of mounting electronic components onto a printed circuit board. This can be done manually with a soldering iron, or automatically using a "Pick and Place" machine.
531 questions
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Land pattern for TDK CAA573 Megacap
I am planning to use one of the CAA573 "Megacap" capacitors from TDK, the CAA573X7S2A476M640LH. According to the datasheet, the following land pattern is recommended:
Length(L)
6.00mm ±0....
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Can I solder SMD mosfets upside down to fix polarity error in design
I'm new to PCB design. I was designing a single layer PCB with both SMD as well as TH components. Apparently I did not configure Kicad properly because all components were "mirrored", which ...
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Are post-soldering flying probe test voltage and current limits standardized to prevent damage to components?
My PCBA house recommended a flying probe test (instead of a manual test procedure that I sent them) for verifying connectivity after soldering.
Could the voltages and currents used by the flying probe ...
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Which package is better to mount on flex PCB, WLCSP or LFCSP?
I am new to flex PCBs. In one of our projects we need to design a circuit with this IC. This IC is available in two packages WLCSP and LFCSP.
Among these two packages, which one is easy to mount on a ...
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Is the STM32H573MIY3QTR compatible with optical pick-and-place?
My PCBA house says that they routinely solder WLCSP packages. Their pick and place machines have "optical alignment" but no "camera alignment". I assume that "optical ...
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Confusion with 3.3V MCU supply capacitor replacement?
I need to reorder some more PCBAs where the board uses a 3.3V MCU(STM32F303), and the decoupling capacitors are a 10V 1µF X7R ±10% 0402 multilayer ceramic capacitors. Unfortunately, this part is out ...
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Buck Regulator Troubleshooting
I've designed a custom PCB for this buck regulator: https://www.aosmd.com/res/datasheets/AOZ2264QI-19.pdf.
This is the circuit I designed:
PCB layout:
PCBA:
The issue is that I am measuring 0V at ...
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Ferrite Bead - Uses with Linear Voltage Regulators on PCBA
The specific technical question I am after is... (as I am trying to ask the right one) What are the consequences good and/or bad for using a ferrite bead before a digital power input on an MCU, where ...
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Sourcing parts for overseas assembly in the current environment [closed]
As many of us may have experienced recently, using assembly services in China has become more complicated. Previously, we could send our files, order parts from Digikey (or similar) to be delivered to ...
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Oxidized switch on RP2040 custom pcb
I have a RP2040 microcontroller on a custom PCB, but the reset button (marked in blue) oxidized quite a bit in one year. You can see the greenish hue over the copper button. This button is the TS-...
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Are there benefits of using GND and PWR planes in this case (5A current) or should I just use wide traces for power?
I’m currently working on my first project and I’ve finished designing the PCB layout in KiCad.
My PCB has 4 layers. The first layer has all the signal traces. The second layer is the ground plane. The ...
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How to create tooling hole on PCB for SMT assembly (KiCad)
I am using KiCAD to add tooling holes to a PCB for surface mount assembly using JLCPCB PCB assembly service.
The following is the guideline from JLCPCB for tooling hole specs:
https://jlcpcb.com/help/...
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Best way to spread solder paste
Wondering if anyone has any tips on how to get good results when manually spreading solder paste on a PCB using a stencil.
I assemble a lot of circuit boards at home as a hobbyist. I've got a decent ...
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Options to rectify pre-fab board with swapped pin positions
I was wondering if anyone has come across a mechanism to easily "swap" the Cartesian orientation of pins on an already manufactured PCB. I have a scenario where opposite polarity power ...
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How can I know the color of the tape when ordering SMD capacitors
I ordered a few SMD components for assembly with my small pick-and-place machine. The resistors came in white tape, the diodes and transistors in black tape, but the capacitors all arrived in ...
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