Electronics Forum | Tue Jul 24 07:15:16 EDT 2007 | james
We are currently have failures on one of our QFN components. We are running this product with lead free paste, lead free boards and lead free parts. They have done a pull test on this component and it showed that the solder joint mainly dissconnect
Electronics Forum | Sun Feb 11 22:55:36 EST 2007 | M.Haris
As i was using this forum first time thats why i wrote two questions Eprom or otp ics AND solder paste content at the same time. Basically i m a SMT Assy Engineer and i m the only one for buying the solder pastes from the vendors. if anyone feel thos
Electronics Forum | Fri Jul 27 12:13:57 EDT 2007 | jdumont
We have issues with these also. They need to be flat to solder well. Reduce the square under the part for the heat sink and youll improve yields. That pad keeps the part lifted high while the other smaller joints reflow and partially attach. You can
Electronics Forum | Mon Feb 12 10:03:34 EST 2007 | slthomas
"(If any element�s composition is greater then is it useful/harmful to our solder paste/assembling or not?) It certainly changes the characterstics of the compound. Why you might change it depends on how you want it to behave. Be more or less ductil
Electronics Forum | Thu Jul 26 23:43:49 EDT 2007 | gioblast
check your stencil design on the ground pad. You might have a big aperture opening that pushing the component away from the paste. Look alos the way your pcb warp. Prioritize side that has component that need flat pcb as much as possible. hope this h
Electronics Forum | Fri Feb 09 15:39:13 EST 2007 | Fat Angry Engineer
That's my exact suspiscion too. This guy is trying to find some type of "scapegoat" for some unknown defect that nobody can figure out. First, he'll try blaming the solder paste, thinking that the CM is too dumb to choose the correct soldering mate
Electronics Forum | Tue Aug 09 13:15:27 EDT 2005 | davef
Initial points for investigation are: * What temperatures are you measuring on the leads that do not reflow well? [How does this match with the paste supplier's recommendation?] * Does the component take solder after being dunked in the solder pot? *
Electronics Forum | Tue Aug 09 13:44:48 EDT 2005 | mtd
The solder on the rest of the board looks good. There are no large components around these parts. We check the profile using a KIC and it met the recommendations of the solder paste manufacturer. I have not did a dip test of the board or components.
Electronics Forum | Mon May 03 10:49:26 EDT 2010 | davef
What is the issue that you have when soldering IC sockets with vapour or reflow?
Electronics Forum | Tue May 11 11:48:32 EDT 2010 | shawnvike
We solder SMD sockets all the time with reflow. What are your issues?
