BGA

Subscribe to Thread

We are a small Contract Manufacturer and have received a p... - Feb 25, 2010 by Duane

Good Afternoon Duane, Surface tension should be adequate ... - Feb 25, 2010 by CL

We agree with CL in the above posting. We talked about this ... - Feb 25, 2010 by davef

Good morning Chris, We had discussed surface tension but we... - Mar 01, 2010 by Duane

I don't think I would reduce the heat at all if there is n... - Mar 01, 2010 by WRONGWAY

So Far, so Good. Solder looks real good. Thanks ... - Mar 02, 2010 by Duane

Hi, Duane, Why don't you try Tacky Flux /Tacky paste flux... - Mar 04, 2010 by TACKY_TSF

How is that going to help hold a BGA to the bottom of the bo... - Mar 05, 2010 by kpm

Duane

#61234

BGA | 25 February, 2010

We are a small Contract Manufacturer and have received a project which has BGA's on top & bottom. 2 larger BGA's on one side (~_20x20mm) & 3 smaller BGA's (~_8x8mm) on the other. we plan on running the side with the smaller BGA's first but need some advice as to how to keep the 1st side BGA's from falling off when running the second side. Any advice would be helpful. Thanks

reply »

#61236

BGA | 25 February, 2010

Good Afternoon Duane,

Surface tension should be adequate to hold the smaller BGA's during second side reflow. You will need to ensure that nothing comes in contact with the parts during reflow. I have added a chipbonder adheasive at the edge of some BGA's that were heavy but you should not have any problem with 8X8 mm.

Good Luck

Chris

reply »

davef

#61240

BGA | 25 February, 2010

We agree with CL in the above posting. We talked about this previously here on SMTnet. Search the fine SMTnet Archives to find threads like: http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=28992

reply »

Duane

#61270

BGA | 1 March, 2010

Good morning Chris, We had discussed surface tension but were not sure if that alone would be enough, so I reduced the bottom side temperature in the oven by 20 degrees to see if that would help. I will be checking results this morning. Thanks for the reply all. Duane

reply »

WRONGWAY

#61271

BGA | 1 March, 2010

I don't think I would reduce the heat at all if there is no vibration in your oven or on the chain you should have no problem with them falling off or moving but you sure don't want a cold solder joint you no the solder joints are so easy to see good luck

reply »

Duane

#61282

BGA | 2 March, 2010

So Far, so Good. Solder looks real good. Thanks

reply »

TACKY_TSF

#61302

BGA | 4 March, 2010

Hi, Duane,

Why don't you try Tacky Flux /Tacky paste flux?

reply »