Electronics Forum | Wed May 29 14:58:41 EDT 2002 | R.Barcelos
There has been an increase in the number of defects regarding the solderability of resistor network arrays(pin opens specifically). Has anyone else experienced this? Also, does anyone have any FYI that they would like to share?
Electronics Forum | Tue Jun 04 18:03:25 EDT 2002 | arzu
I recognize this problem as well, building only prototypes with all attention possible, the (small) networks need extra attention for they show opens. Maybe it helps to increase the placementforce a bit to increase the contact area to the paste befor
Electronics Forum | Wed May 29 22:00:19 EDT 2002 | davef
Not sure of the package style or the specific problem you're talking about, but consider searching the fine SMTnet Archives since we have talked about this previously, several times.
Electronics Forum | Thu May 30 11:37:27 EDT 2002 | Ron Costa
Hi Ray, A couple of things to look into: 1.date code of reel 2. what is the termination made up of tin/lead or tin/lead/palladium. Check with part manufacturer. 3.paste volume/aperture openings 4.PCB plating 5.solder paste formulation Good luck R
Electronics Forum | Wed May 29 19:00:08 EDT 2002 | russ
Have been seeing a pretty fair amount ourselfs. it seems to come and go. Couple of questions 1. Are the parts shifting to one side during reflow? 2. is it true non wetting to the component? I have been experimenting with different pad geometries a
Electronics Forum | Mon Mar 21 20:18:40 EST 2005 | davef
What is the specific problem? Tell about: * Resistor pack * Board layout * Stencil aperatures
Electronics Forum | Mon Mar 21 11:10:32 EST 2005 | blueflag
Help We are having trouble soldering the above we have changed pad size but still have problems ???????
Electronics Forum | Tue Mar 22 06:09:20 EST 2005 | blueflag
The size is 1206 approx with concave terminals and we are using 1 to 1 appertures on 5thou screen Thanks for reply
Electronics Forum | Mon Mar 21 12:02:09 EST 2005 | Rob
Hi Colin, Are you using the 1206 package with 4 elements or one of the higher density smaller packages? With the first type you can get them in both Convex or Concave terminations, with most of the solderability problems associated with using the C
Electronics Forum | Tue Mar 22 08:13:39 EST 2005 | Rob
Hi Colin, If it's easy for you to swap to Convex try the Rohm MNR14 series, Bourns CAY series or Eurohm NC Series. Else try a 10% apperture reduction - however we usually had a 6 thou stencil when we did this. Cheers, Rob.
