Electronics Forum | Thu Jul 05 13:47:10 EDT 2007 | arun2382
QFN assembled on a PCB indicates paramteric fails when tested. When the QFN on PCB is reflowed a second time, it recovers and passes testing. Visual, X-ray inspection revealed no anomalies. Cross-section images of solder joint revealed no anomalies (
Electronics Forum | Tue Feb 21 21:17:41 EST 2006 | Cal Kolokoy
M, The paste height is what you establish it as. You're probably using a laser measurement system, and these depend on where your reference datum is. Some will measure from a silkscreen, a trace, or solder mask. These add height, not to mention H
Electronics Forum | Sun Aug 28 23:53:58 EDT 2016 | aemery
I don't think there is a camera off message in the software, but I might be wrong. So I am making a bit of an assumption here that you didn't have a displayed image and your error was a fiducial not found error. I am also wondering if you decided to
Electronics Forum | Tue Feb 14 22:48:06 EST 2006 | Cal Kolokoy
That is a tough situation and a tough answer for us SMT forum participants. After all, most of us are in the business of placing and soldering components to circuit boards, and you know the saying; you can't make solder joints with an unsolderable su
Electronics Forum | Tue Feb 14 13:16:49 EST 2006 | Carol Stirling
CRITICAL DILEMA! Has anyone run into the problem described below and if so, what was the fix (besides not dealing with this Supplier)? Also, we do not have component manufacturing process experience. We are purchasing a surge resistor that function
Electronics Forum | Mon Oct 29 19:48:03 EST 2001 | davef
Sounds like the connector is not solderable. * Do they take solder when hand soldering? * Do they take solder when using a hotter flux than you normally use? * What flux are you using? * What are the materials used in fabricating these connector le
Electronics Forum | Thu Jul 29 21:19:09 EDT 2004 | davef
You need: * Solder that is active enough to made those leads take solder * Reflow recipe that makes the most of the flux is the paste The flux in neither of your solder pastes is getting done.
Electronics Forum | Thu Aug 05 09:09:01 EDT 2004 | Kris
is QFP lead co plnarity an issue ? If the QFPS are not sitting in the paste and that can be random if they are very close to the manufacturing tolerence Thx
Electronics Forum | Fri Jul 23 09:17:16 EDT 2004 | davef
The more we think about this, the more we think you should join the 20th century and upgrade from your good ol' WS609. We know this will be tough. We used the stuff for 10s of years.
Electronics Forum | Fri Jul 23 20:59:34 EDT 2004 | KEN
Ahmen bro. About 6 years ago I sent 12,000 dollars of this paste to the recycler because I calculated the cost of direct manufacturing defects would outweigh the cost of the paste!
