Electronics Forum | Tue Apr 16 05:05:32 EDT 2013 | stivais
We recently had a discussion with customer's QM - he claims that calculations for a proper solder wire diameter and soldering iron tip size (and temperature) have to be performed and documented for all manual (T/H) solderings (based on component size
Electronics Forum | Wed Apr 27 01:20:22 EDT 2005 | Frank
Are you sure about your dimensions? .45mil ball diameter and .8mil pitch, and a body size of 16x8mils is really, really tiny. I assume you mean millimeters and not mils? 1mil = 0.0254millimeters If your stencil is 5mils and your ball diameter is
Electronics Forum | Wed Apr 27 20:55:10 EDT 2005 | KEN
One thing that may have been over looked: Not all solder pastes are created equal. Period. The best way to avoid these situations is to characterize you material (and your process). The fact is you could try every aperture shape under the sun....a
Electronics Forum | Fri Apr 29 07:09:10 EDT 2005 | jdumont
Really you think the 256 is the issue eh? I have some a sample of the type 4 powder size coming in hopefully today. Hopefully that will help, if not its back to the old solder eval drawing board. I love my job...
Electronics Forum | Wed Apr 27 10:47:26 EDT 2005 | HOSS
A 1:1 pad to ball diameter will cause the balls to collapse more giving you less post solder component standoff. Depending on the application of this product and required reliability, you may want to stay with the padstack being used. You may try c
Electronics Forum | Wed Apr 27 07:16:40 EDT 2005 | jdumont
Thanks a lot guys. The part dims are in mm by the way. So last night i was looking at the .pcb file and saw that the pad size and stencil are both .013" while the ball on the BGA is .018" (sorry for switching from metric). Is this ok or can i have en
Electronics Forum | Wed Apr 27 02:22:08 EDT 2005 | grantp
Hi, There are a number of things you can try. You are already using 1:1 hole to pad ratio, and that's good as you need the size. I would try an electroform stencil as that will have a smooth side of the aperture and help paste release. Don't use c
Electronics Forum | Tue Aug 08 18:28:11 EDT 2000 | Shawn Mavity
I am looking for a supplier that I could by approximatly 7000 preformed solder rings from that will make it cost effective. We need to different sizes and so far the quotes that I have recieved are some what out of the price range to make it an optio
Electronics Forum | Mon Jul 16 15:49:33 EDT 2001 | Steve
The solder balls you are talking about are caused by too much paste. Reduce the size of the stencil aperatures. Concerning removing the solder balls, the first thing you need to ask yourself is, do I need to remove them. IPC-610, 12.4.10 states, "Ac
Electronics Forum | Wed Jul 27 09:58:05 EDT 2011 | davef
Pressure printing systems Conventional stencil printing techniques have fundamental limitations as regards paste handling: The volume of paste available for printing is limited, so frequent replenishment is necessary Paste is difficult to c
