Electronics Forum | Tue Aug 20 18:15:02 EDT 2002 | davef
Haaaaa!!!! Soldering to plastic!!!! An apt analogy!!! I like to compare it to soldering to dirt. Some thing. In fact, you are soldering on nickel, when soldering on many things. It�s just that the gold, er Pd, flash enables the wetting mechanism
Electronics Forum | Thu Sep 12 18:50:17 EDT 2002 | scottefiske
Sorry so late in getting into this tehcnical issue. I have seen this condition before...90% of the time in conditions of adhesion on a water soluble material... is the paste...exposure time, lot issue, etc..basically the paste's carriers and binders
Electronics Forum | Wed Oct 02 11:44:58 EDT 2002 | slthomas
We found that a slightly more active flux was all we needed to provide sufficient wetting on the one AgPd part we put down. Unfortunately the paste we tried also slumped terribly, so we nixed that fix. It's a low volume product (50, once every 3 mo
Electronics Forum | Thu Oct 17 16:09:18 EDT 2002 | Hamish
Has anyone had trouble with SMD machine placing of SC-79 (approx 0402) varicaps (infineon, alpha, philips)? Using the recommended pads from Infineon I am struggling to get the component to place flat on the PCB and the pins to wet properly every time
Electronics Forum | Sat Jan 04 09:48:22 EST 2003 | Steve
Yes this is 1st generation, a large metal tube positioned horiz. with valves to wet the wiping towel all at once. We have the newer sys. on the other Ekra, motor driven gear rack and selonoid dispenser.I talked w/ their tech. and got "Oh yea,,they al
Electronics Forum | Thu Jan 16 16:15:27 EST 2003 | billg2753
I have received a few boxes of fully assembled boards that have damaged packaging boxes due to rain water. There is visible moisture inside the ESD bag. I have no idea how long these boards have been exposed to moisture. Does anyone have a procedure
Electronics Forum | Fri Mar 07 21:10:31 EST 2003 | neil
Remember the gold is only deposited to provide an air barrier so that the nickel does not oxidise. Normally the gold is absorbed into the solder joint so that the solder forms a joint with the nickle. It is not unusual to see gold remaining on pads i
Electronics Forum | Wed Mar 12 22:39:58 EST 2003 | MA/NY DDave
Hi Thanks more than you know for your honesty. Honesty adds 200-300% value in my book of all times. I am glad your problem was so easily solved, and I agree that you did the right thing by appologizing to your PCB supplier. Great, Lets move on Y
Electronics Forum | Wed Apr 16 08:43:00 EDT 2003 | davef
Given that the LED work properly after being touched-up and that you don't have problems with other components, you may not be wetting the LED termination solderability protection during your normal reflow. Use a profiler to check the temperature on
Electronics Forum | Mon May 05 18:48:23 EDT 2003 | Kris
Hi, It is expected that lead-free will have reduced tomstoning. As it has a higher surface tension and does not wet as well as the tinlead paste it exibit lower tombstoning. Addiotnaly commercialy available lead-free alloys may not be true eutectic
