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Questions tagged [fpc]

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

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Is there flux that doesn't brown under heat?

Adding flux (MG8341) to rework a component is resulting in ugly brown stains as shown in the picture below; this is a flexible circuit board with white cover-lay. The flux started to turn brown add ...
KJ7LNW's user avatar
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5 votes
1 answer
373 views

Using flex PCB for RF signal instead of coax cable

I have been looking into reducing the number of different cables needed for my project: I have a couple of photodiodes on separate boards, with a total of 7 analog outputs. They have signal bandwidths ...
EENovice's user avatar
0 votes
1 answer
35 views

Double contact FPC connector

For an LCD, I got this connector F31L-1A7H1-11015 and in datasheet, it says the connector is double contact point connector, however when I insert the flex PCB of the LCD into this connector, the top ...
Gusto's user avatar
  • 27
0 votes
0 answers
31 views

Handling flexible PCB coverlay openings in fine-pitch footprints

I'm trying to understand how to handle fine-pitch pads on flexible PCBs. For example, a LIS2DH12 accelerometer uses an LGA-12 (2mmx2mm) footprint with 0.25mm wide pads on a 0.5mm grid. I'm doing a ...
TvE's user avatar
  • 288
4 votes
1 answer
188 views

Help needed identifying this 180 degree bottom insertion ffc connector and how to release the cable

I could not see any hinge or flap or other release mechanism. The connector seems like it is one piece of plastic with no obvious seams although in some images I think tooling marks look a bit like ...
Funkyeah's user avatar
  • 301
1 vote
1 answer
123 views

FPC design Flex PCB

I want to design a flex PCB to stick a membrane keypad onto the back of a regular PCB. We want the two sections: one for power, LEDs, etc., and one flex PCB for just the keys. How may I design the FPC ...
Wes Ellgass's user avatar
2 votes
1 answer
64 views

FFC connector with solder terminals on cable entry side

Are there any FFC connectors that have all solder pins on the same side as the FFC slot (i.e. where the FFC cable is inserted). I know in most situations / designs this wouldn't make any sense, but I ...
Mich R's user avatar
  • 43
1 vote
2 answers
752 views

How to specify the stiffener for ordering Flex-PCBs at JLCPCB

I have a Flex-PCB design that contains several areas that are supported by stiffeners. I am trying to order the PCB at JLCPCB but can not figure out how to specify the areas where the stiffener is ...
Johannes's user avatar
  • 279
0 votes
0 answers
16 views

FPC Connector 12pin Top & Bottom Contact

I'll use 12 lines FPC cable (0.5 pitch) under 2 layer (6 lines Top & 6 lines bottom) because I've limited route space where the cable needs to cross. Do you know any type of connector that match ...
Rodrigo's user avatar
0 votes
0 answers
103 views

LCD Display with FPC to Arduino

I’m very new. My game is push button, but it’s important that the display is transparent. I have this LCD screen. (data sheet) I was going to connect it to my uno using this PCB. But it didn’t fit ...
Supernew's user avatar
3 votes
3 answers
296 views

Fixing an 0.5 mm pitch, 18-pin FPC tear

I accidentally tore my Lego EV3's LCD FPC (Flexible Printed Circuit) while opening it. The FPC is a 1.0mm 18-pin-pitch FPC which near the end is converted to a 0.5mm one. I found this post in the ...
pythoncat's user avatar
2 votes
1 answer
193 views

FPC connector name

I am trying to make microscope from my old Xiaomi Note 10. I made kiosk mode android app. But to make it really convenient I have to move camera away from screen. So I am exploring options to make ...
Max Fry's user avatar
  • 143
0 votes
3 answers
639 views

Is there a standard for FPC pin numbering direction?

Is there a standard for FPC connector pin numbers? (ie: which end is pin 1) I'm trying to design a PCB that uses an LCD display module with pin numbering such that when the cable is contact down and ...
Brad Robinson's user avatar
4 votes
1 answer
239 views

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's user avatar
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1 vote
1 answer
712 views

What schematic symbol is used for a flex cable?

Generally asking, but primarily for KiCad, what is the schematic symbol typically used for FPC/FFC/flex cables? That is to say, the flat end which is sometimes stiffened and does not have a connector ...
Daniel's user avatar
  • 365
4 votes
2 answers
809 views

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 ...
pm4812's user avatar
  • 67
1 vote
1 answer
105 views

Most probable cause for unwanted capacitance on serial line?

I'm a PCB rookie and just got the first sample of a 4 layer flex-rigid board that I made. I'm using 3.3V TTL-UART @ 115200 baud, the stackup is as follows: CU 35 (signal) Prepreg 0.7mm CU 35µm (GND) ...
Alexander Ohm's user avatar
1 vote
2 answers
1k views

Confirm FFC pinout for forward and reverse direction

The first timer is using FFC so I would like to know about the pinout of the FFC forward and reverse cable. Below is an image from eBay showing both types; I have annotated pin1. Is my understanding ...
JR128's user avatar
  • 11
0 votes
1 answer
53 views

Flex boards routing inside device housing [closed]

I have seen several dslrs such as Nikon teardowns and I really admire the way they design the flex cables and FPCs. What I'm wondering is how do they manage to design such complex flex shapes folded ...
Tommy's user avatar
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3 votes
3 answers
316 views

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 ...
Ne3M's user avatar
  • 53
1 vote
2 answers
170 views

Is there any way to get 2 sided FPC with stiffener?

We need to design an FPC board that consists of components like mezzanine connectors that are centered on 2 sides, top and bottom layers. We have concerns about attaching the FPC board to the main PCB ...
devscg's user avatar
  • 153
0 votes
1 answer
80 views

Joining two rigid PCBs in a non-flat configuration [closed]

I would like to design a very minimal split keyboard like the GergoPlex or Ferris Sweep, but my wrists get sore easily with extended pronation and ulnar deviation. As such, the design I have in mind ...
ConlangBabble's user avatar
0 votes
2 answers
377 views

How to open this FFC/FPC connector?

I am working on an old minidisc player (Sony MZ-E900) and the motor is connected via this FFC/FPC cable. I have downloaded service manual for this model and for this flexbile connector there is only ...
vviston's user avatar
1 vote
1 answer
166 views

Using a straight end FPC connector for a tapered end FPC

I am new to working with FFC/FPC, and had a question about the different types of ends for these cables. I have a piezomotor that connects via a 1mm pitch tapered end FPC. I need to connect this to a ...
Kristina's user avatar
1 vote
1 answer
252 views

What are these notches in an FPC for?

We are given these cute LCD displays (China made of course, drawing here on page 4.) There is a pair of notches on the connecting FPC. They are not next to the contacts (I've seen some connector ...
Lorenzo Marcantonio's user avatar
1 vote
1 answer
372 views

How to implement a Bookbinder PCB design in Altium

I am planning to design a bookbinder with airgap rigid flex PCB using Altium. Based on guidelines from Altium, and various other sources, it is important to have "staggered lengths", to ...
JAS's user avatar
  • 11
0 votes
0 answers
54 views

Microstrip on FPC board

Do anyone know, what is the strange track on FPC board on image below? My guess is, it is something like a microstrip track. The image is for a FPC board, that measure cell voltage of batteries.
Rashid's user avatar
  • 89
1 vote
1 answer
326 views

What are the concerns of vias-in-pad on flex PCB without filling?

My PCB fab said they can't fill the via-in-pad for flex PCB. The min hole size is 8mil with 20mil diameter. From google search, the concern is the solder will be drawn into an open via which could ...
jsmith's user avatar
  • 669
4 votes
1 answer
554 views

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.
jsmith's user avatar
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3 votes
2 answers
1k views

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 ...
yolt's user avatar
  • 113
1 vote
1 answer
65 views

Can you physically connect an FPC to a FFC socket that has the same pitch but more circuits?

I'm interested if it's possible to make a 50 pin FPC breakout board and use it for cables of less pin count but of the same pitch?
George's user avatar
  • 165
0 votes
1 answer
165 views

Does the impedance profile of flexible PCBs include the adhesive layers?

I'm looking at this page on PCBway and trying to get these values into Altium in order to get the right impedance profile. As I understand, I should use the finished copper thickness to get the right ...
SpiRail's user avatar
  • 444
0 votes
0 answers
71 views

Not detecting closed circuit in Goldtouch keyboard key presses

Context While converting the Goldtouch Go!2 Mobile keyboard from Bluetooth to micro USB, I'm experiencing some difficulties in registering the keystroke signals coming out of the FPC connector. Setup ...
a.t.'s user avatar
  • 103
1 vote
1 answer
494 views

How to design FFC's/FPC's Even/Odd pattern in Altium

I want to design the even/odd pattern of FFC (flexible flat cable) in Altium. I don't know the exact term used to describe it, but the recommended drawing of this FFC from its target connector's ...
Ahmed's user avatar
  • 171
0 votes
2 answers
333 views

Is the increase of impedance over a small hatch area on a FlexPCB negligible?

I have a FlexPCB with 4 layers and total thickness of about 200 µm. The second layer is a ground plane that is solid copper over the entire FlexPCB. To increase flexibility of the FlexPCB, I want to ...
mpa's user avatar
  • 35
0 votes
1 answer
413 views

Does the signal to the NFC antenna require shielding?

My design requires a NFC antenna to be located on a different board and due to space limitations, a uFL connector can't be placed for a mini coax connection. A flex cable solves many of the design ...
pcbguy's user avatar
  • 83
1 vote
1 answer
130 views

What kind of FPC is this, and what should I couple it with?

I'm working with these planetary geared micro stepper motors which come without a datasheet or any information from the sellers. I'm having a trouble figuring out how I should mate the FPC cable, can ...
Orbitronics's user avatar
1 vote
1 answer
1k views

How do cheap Raspberry CSI-2 cables get around differential impedance matching

I am trying to design a circuit on (double sided) flex PCB that happens to have CSI-2 signals on it. I would like to find out what is wrong with my deductions presented below, or what part of ...
JacobV's user avatar
  • 171
0 votes
0 answers
43 views

Trying to build custom electronics connection to a motorized zoom/focus lens

I'm a beginner when it comes to electronics, I had some success with pretty simple arduino based projects like blue tooth controlled stepper motor assemblies using well documented drivers and ...
leoshmu's user avatar
4 votes
4 answers
1k views

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 ...
Noah B's user avatar
  • 41
0 votes
1 answer
97 views

Extension from OLED display to driver board

I have purchased this display for a prototype in development. Product: https://www.displaymodule.com/collections/oled/products/2-8-256x64-monochrome-graphic-oled-display-module-spi-mpu Datasheet: ...
Jacob Rodda's user avatar
-1 votes
1 answer
374 views

What is the mechanism of water damage to this flex circuit keyboard track?

I have a wireless Logitech keyboard which suffered water damage: after it got submerged in water, some keys stopped working. It was very strange to me, since I guessed that if some important element ...
Alexey's user avatar
  • 107
0 votes
0 answers
87 views

Change FPC Pitch

I recently had a PCB made with a FPC on it. Unfortunately its the wrong pitch (Yes really stupid oversight) and so we need a solution that doesn't involve ordering a new board. The board has a 4 pin 0....
Sebastian Pelletier's user avatar
0 votes
1 answer
52 views

Is it possible to mount a 7-Segment on an FPC and what points need to be considered?

I am designing a project with a flat flex PCB, in which I would need a 7-Segment display similar to below picture. I would like to avoid to add an extra PCB with a connector or hot-bar just for the ...
KarlKarlsom's user avatar
  • 1,822
1 vote
1 answer
961 views

How to lay out Gerber files for rigid-flex PCBs

I want to move to rigid-flex PCB design for our product, to eliminate need for the FFC cables we currently use. I have found vendors providing this service but I cannot find any information on how to ...
bgarrood's user avatar
  • 221
3 votes
2 answers
1k views

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. ...
Rocketmagnet's user avatar
  • 27.5k
1 vote
1 answer
520 views

Help identifying this damaged FFC/FPC connector

I am trying to identify this damaged connector on one of the PCBs of a Konica Minolta Vivid 910 laser 3D scanner. I wish to find a suitable match for replacement. It connects the main logic board with ...
jarshvor's user avatar
0 votes
3 answers
418 views

FPC Connector - Matebook X Pro

Please excuse me if this is not the right place to ask this question. I have been looking for a specific ribbon cable (motherboard to LCD board) for my Huawei Matebook X Pro for more than a year now ...
SymmetricsWeb's user avatar
-1 votes
2 answers
135 views

What is the meaning of these datasheet dimensions?

I am trying to buy a part for a project and I can't seem to understand what, ("B = A + 0.83[4.00]") means. Is this datasheet in mm or inches? Your help would be greatly appreciated.
Mick Kelly's user avatar
1 vote
2 answers
1k views

FPC Cable Repair

Is it possible to repair this type of FPC cable? I am a filmmaker and have just basic soldering skills and know this type of repair is beyond me. This is from a LCD Touchscreen. Is this cable ...
mraaron895's user avatar