Electronics Forum: embedded (Page 1 of 10)

Flex embedded into FR4

Electronics Forum | Wed May 28 12:31:18 EDT 2003 | larryk

This is our first experience with running embedded flexs. Our board supplier suggested that we prebake our assemblies before placing components. What does everyone else do? Is prebaking normal when a flex is embedded?

Flex embedded into FR4

Electronics Forum | Thu May 29 10:14:51 EDT 2003 | davef

In itself none, but heating moisture laden flex can cause the flex to delaminate.

Flex embedded into FR4

Electronics Forum | Thu May 29 10:05:10 EDT 2003 | swagner

I hate to answer a question with a question but what are the particular effects of moisture absorption in a flex circuit?

Flex embedded into FR4

Electronics Forum | Thu May 29 14:27:04 EDT 2003 | larryk

This flex is .001" Kapton polyimide. The flex portion of this rigid flex consists of 3 layers of 1 oz copper with 5 layers of Kapton. Part of the flex is sandwiched in standard FR4 with two layer of copper on each side for a finished thickness of .

Flex embedded into FR4

Electronics Forum | Thu May 29 10:42:40 EDT 2003 | swagner

So is it fair to say that on a moisture laden double sided flex circuit you could see an increase in tombstoning on the 2nd pass due to warpage created by delamination? In other words a 0603 for instance could tombstone due to the delaminated surfac

Flex embedded into FR4

Electronics Forum | Thu May 29 07:52:44 EDT 2003 | davef

The permeability of polyamide film (Kapton) is 54 g/sq m/mil/day and the total absorption is 2.8 wt%. The absorption rate changes rapidly over time with a large percentage occurring in the first 5 minutes and nearly reaching completion in 30 min to

looking for info about software tools for embedded systems

Electronics Forum | Tue Sep 07 10:58:35 EDT 2004 | davef

http://www.embedded.com/

looking for info about software tools for embedded systems

Electronics Forum | Tue Sep 07 16:07:54 EDT 2004 | pluppie

Thank you very much. One of the pdf's really covered my questions.

looking for info about software tools for embedded systems

Electronics Forum | Mon Sep 06 15:54:53 EDT 2004 | pluppie

Hi, I have to make a presentation about software tools for embedded systems. I've been surfing around but can't find any non-commercial interesting website. If anyone knows some good info, you would make my day. My email is foefeltje@hotmail.Com

new site - embeded links

Electronics Forum | Thu Feb 01 09:55:20 EST 2001 | davef

Embedded email links in emails don't work either, in the unlikely chance that that's a help.

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