Electronics Forum | Bob |
Wed Apr 07 19:40:07 EDT 1999
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