Questions tagged [flex]

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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 ...
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2 votes
1 answer
431 views

What does "P+ ID P-" mean on this battery flex?

My nokia 6.1 plus battery has these labels on it's flex. The phone has been off for about a year and doesn't get ON so I want to shock it's battery. The problem is I do not know battery terminals and ...
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67 views

Flex PCB USB traces layout

I am designing a FPCB and I'm trying to figure out how to make sure the USB traces impedance is 90 Ohms differential. The USB traces from the USB connector to the MCU are about the same lenght, 27.1mm ...
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  • 71
1 vote
1 answer
112 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 ...
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  • 151
0 votes
1 answer
45 views

Stiffeners needed under DFN parts in flex PCB?

This is the first time I'm designing flex PCB and I wonder do I need to put "stiffeners" under DFN parts which are soldered on flex PCB? Stiffeners would be on opposite side of flex PCB than ...
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1 vote
0 answers
70 views

Fine-pitch SMD pads on flex PCB using coverlay rather than soldermask

SMD: "Solder-Mask-Defined" NSMD: "Non-Solder-Mask-Defined I am making a thin flex-PCB (0.2-0.3 mm) on which I am going to mount a component which has SMD pads. I would like to also make ...
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  • 2,165
4 votes
2 answers
916 views

How to bond flex to rigid pcb

I have a rigid PCB and a flex (4 layer) PCB. I want to bond them instead of using a connector (although if what I am expecting is impossible I will use a connector). What methods are available for ...
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50 views

How to connect five flex sensors to on esp8266?

I’m using a lolin nodemcu 8266. I was wondering if it is possible to connect 5 flex sensors to one node (to make a glove which detects finger gestures). I’m an experienced programmer but new to ...
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1 vote
1 answer
189 views

Purpose of solid plane on flex in wireless earbuds

I'm looking at a teardown of Sennheiser Momentum wireless earbuds. It is a rigid-flex design that folds into the casing:  My question is about the flex that sticks out to the right in the picture ...
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  • 343
3 votes
1 answer
376 views

Hexagonal hatched polygons Altium

I'm recently trying to design a flex PCB. I haven't been able to find any specific tutorials on how to do this in Altium. But I did find Altium blogs detailing some of the best design practices for ...
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  • 43
0 votes
2 answers
645 views

How accurate are flex sensors?

So for the project I am working on I plan on measuring very precise changes in angle, possibly up to 5 degrees of accuracy. Are polymer ink sensors (the classic Nintendo power glove flex sensor) the ...
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0 votes
1 answer
232 views

I need to do a membrane pcb for a keyboard or a flexible PCB like a membrane PCB

I need to design a membrane PCB for a keyboard and/or flexible double sided PCB that works like a membrane PCB. My problem here is that I don't know how to do the buttons, with one contact of the ...
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  • 128
0 votes
2 answers
318 views

Thickness for polyimide stiffener in flex pcb

I'm struggling to find some guidelines for the thickness to specify for a polyimide stiffener under a surface mount connector on a flex board. I see lots of call us and we'll help you figure it out ...
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  • 1,707