Footprint on Flex

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   Hi to all,
I am writing today because I am working on a new project with a flex-rigid pcb.

I have not a big experience working with that type of pcbs and I started reading about Flex Circuit Technology.

I read that is important that the pad extends under the coverlayer.For that reason, the recommendation from that author is to make the pad 250um-375um larger. 
I attached a photo about I mean.

I suppose that I will have to modify my footprints but 0.25-0.375mm is a nice length?

In order to work with THT pads is the same recomendation.

Did anyone have any experience with flex materials?

Thanks to all.
david

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dramos Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 18 Feb 2021 Status: Offline Points: 61	Post Options Post Reply Quote dramos Report Post Thanks(0) Quote Reply Topic: Footprint on Flex Posted: 25 Mar 2021 at 4:47am
	Hi to all, I am writing today because I am working on a new project with a flex-rigid pcb. I have not a big experience working with that type of pcbs and I started reading about Flex Circuit Technology. I read that is important that the pad extends under the coverlayer.For that reason, the recommendation from that author is to make the pad 250um-375um larger. I attached a photo about I mean. I suppose that I will have to modify my footprints but 0.25-0.375mm is a nice length? In order to work with THT pads is the same recomendation. Did anyone have any experience with flex materials? Thanks to all. david