Author Topic: Are FFC connectors marked for pin 1? Is there any standard to it?  (Read 746 times)

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Offline alank2Topic starter

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Are FFC connectors marked for pin 1?  Is there any standard to it?
 

Offline alank2Topic starter

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Re: Are FFC connectors marked for pin 1? Is there any standard to it?
« Reply #1 on: October 27, 2022, 12:06:43 pm »
Anyone?  It seems you can order FFC cables same side or opposite side conductors.  Same side inverts the pin order, but opposite side does not.  I'm wondering if there really is no "pin 1" standard which would mean that connectors and cables are both never marked.
 

Offline julian1

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Re: Are FFC connectors marked for pin 1? Is there any standard to it?
« Reply #2 on: October 28, 2022, 07:31:22 pm »
I ran into this, with a pcb design where the physical ffc connector was flipped/reversed to the desired orientation. The solution was to just buy the corresponding ffc. Eg. If the connector was all upper pins active, then get the one with all lower pins active.

So it kind of doesn't matter, and one can cover the cases with part selection. There are also connectors with both upper and lower pins active. The difficultly is an accidental mistake, and if the flex is inserted upside down, it will put unwanted voltages on all device pins. So they should probably be avoided.   
 
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