Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [fpc]

Questions regarding Flexible Printed Circuits. This is opposed to standard PCBs made of solid copper clad boards.

Questions regarding Flexible Printed Circuits. This is opposed to standard made of solid copper clad boards.

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What's the purpose of traces that are later punched out?

I've found this odd feature on an FPC in a Camera than handles button and switch input. You can see there are traces that look like they were once connected and later punched out to be cut. The one on the left once short-cut a button, which would…
iFreilicht
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Flexible-PCBs: what data is needed for manufacturers?

Can someone explain more about how you generate data for flexible or flexi-rigid PCBs for manufacture? Do I just make more layers and export more gerber files? Is there anything I need to keep in mind when sending these to be manufactured? I've made…
kerblogglobel
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Understanding the Maximum Speed that can be Transmitted over a Cable

I am trying to source a FFC/FPC cable for USB3.0 (+5gbps). This brought me to the question of signal transmission. I'm somewhat of a beginner in this topic. I know that you should match impedance on your PCB with your connector/cable to minimize…
Nick
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Solder Mask on fPCB starting to degrade

I have a flex-PCB that is acting as a sensor bus for one of my projects. I started getting some wonky readings from one of the sensors, but I found that if I removed the sensor from the bus (with minimal heat) the sensor was working fine. Before…
thron of three
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Flexible Watch Circuit Parts

I'm working on a project to make a wristwatch similar to this one: Now I have the ability to make flexible PCBs since I accidentally bought some crazy thin copper clad. I obviously want to use SMD LEDs since they're pretty small. What type of \$\mu…
NickHalden
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What are standard design rules for a Flex Printed Circuit (FPC)?

For an FPC made out of Kapton (polyimide), what are the: min trace width min trace-trace separation min distance from a trace to the edge of the FPC min drill hole diameter min distance from a drill hole to the edge of the FPC min distance from a…
AlcubierreDrive
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Is it ok to bend a VIA in a Flex Printed Circuit?

On a Flex Printed Circuit (FPC) made out of Kapton polyimide, will anything bad happen if I put a VIA in a part of the FPC that has to bend? VIA size: 0.2 mm hole diameter in 0.4 mm copper diameter FPC bend radius: 0.7 mm Kapton thickness: 0.2…
AlcubierreDrive
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10-contact FPC socket has 12 PCB terminals

I have to place an FPC socket on my PCB. I selected 0.5 pitch and 10 contacts connector. Everyone has 12 PCB terminals instead of 10. I am confused, what are those two extra pins for?
Mukund
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At what data rate should we consider PCB via back drilling? How about flex PCB?

Hello community member, I have a 4 layer PCB. At what data rate should I consider via back-drilling? Also do we back-drill 3 layer flex PCB? Thanks.
jsmith0910
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How to connect a flex ribbon cable to a screw terminal block?

Does anyone have ideas on how to mate a flex PCB with a screw terminal block? Some background: At my workplace, we're using the following Keysight DAQM900A Datalogger MUX cards: In the past we've placed the flying leads of our cables into each slot…
Noah B
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Altium: STEP File of Board with Multiple Layer Stacks Exports Incorrectly

I have been having this issue for some time and have not yet figured out whether it is a user error or an Altium bug. I have a PCB design with two layer stackups: In the Altium 3D view it looks good. You can easily see where the different layer…
DerStrom8
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Flex PCB controlled impedance

I am absolutely new to flex PCBs. I saw some from time to time but never designed one myself. Now I'd like to get into this topic and the first task would be to create a ~ 10cm board to board interconnect flex PCB with 90 ohm (USB) and 100 ohm…
pm4812
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Impedance matching and termination on a flexible PCB carrying a 4.8 MHz clock signal, need stack up recommendations

I need some expert advice and I trust I can get it here. I am in the process of designing a system that uses a PDM microphone connected to the the microcontroller via a flexible PCB (4.8 MHz clock with obviously much faster slew rate for rising and…
Ne3M
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FPC connector pinout

I am thinking of using the 0526101633 FPC connector in my design. I need 16 pins to be connected. When looking at the schematic symbol I am a bit confused as to which what does 1A and 1B mean. Are pin A and B connected internally? Here is the…
yolt
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Locally hatched ground plane to increase differential impedance

I am designing a flexible PCB to carry two types of differential signals. One is about 1.2Gbps 100R differential impedance, while the other is only 3Mbps, with much more tolerance on the impedance. It was very hard to achieve a differential…
Rocketmagnet
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