Electronics Forum | Fri Apr 09 08:58:28 EDT 1999 | Justin Medernach
| I'm not sure about limits but perhaps underfilling the BGA might easy your mind. Treat the BGA as something similar to a flip chip and dispense underfill around the part. The rigidity gained by the cured underfill may be enough to alleviate some
Electronics Forum | Fri Oct 22 04:09:22 EDT 2004 | christina
Is there anyone who knows the yield rate difference for SMT on multi-flex boards and rig-flex boards ? Basically, I think the yield rate should be higher for rig-flex than multi-flex due to the poor dimensional stability of polyimide, since multi-fle
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 .
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.
Electronics Forum | Fri Oct 01 09:32:25 EDT 2010 | mazjal7
Rob, thank you for input. I notice you mention a baking process for the flex circuits, this is our first time with flex assembly, do the flex circuits need to be baked prior SMT, Moisture? Thanks, David
Electronics Forum | Tue Mar 03 03:31:07 EST 2015 | vb7007
Hi We are trying to Solder LCD Flex to PCB. Few suggested Z-Axis Film (Conductive tape) which can be stuck between Flex-PCB and bonding by applying hot soldering iron across the flex. Is this effective method. If there is any other option, please su
Electronics Forum | Tue Jun 26 10:23:43 EDT 2018 | ilavu
This video does not show FlexJet head, It is Flex head with 4 spindle. We have about 5 GSM with flex and FlexJet head with OS/2 and 4 with Windows2K. If you need any help, I will be glad to help you. Tushar
Electronics Forum | Mon Feb 28 16:47:26 EST 2005 | jdengler
John, No vacuum. I use tape to hold the flex flat. Panels are hard. Some flexes I do 3 up some 1 up. Larger components that I can get a repeatable location of the flex are 3 up. 0805 and smaller are 1 up always. I talked to a flex house once a
Electronics Forum | Fri Feb 25 15:08:30 EST 2005 | jdengler
John, We tape (usually high temp tape) flex to a fixture (usually 0.090" piece of bare FR4). We make an outline on the fixture to get a rough location then use fiducials on the flex for alignment. Print, place, reflow, cool, remove flex. When the
Electronics Forum | Sat Dec 01 13:51:26 EST 2012 | anvil1021
In my experience with flex the flex provider is the best place to go for these pallets. The competent flex and rigid flex providers will also provide the carriers if requested. Once you see what they are providing you, you could most probably make th
