Electronics Forum | Thu Oct 01 08:34:50 EDT 2009 | davef
First, the reflow thermal recipe provided by your paste supplier is only a ball park guess. Beyond that, the temperature measured by thermocouples on your oven heaters are only loosely related the temperature of solder paste on your board. You need t
Electronics Forum | Sat Oct 31 01:22:35 EDT 2009 | mysmt
We have performed some EDS analysis and found > high percent (approx 18% ) of Ni on surface of > gold pad. Found Tungsten as well. This is an > HTCC alumina package. Thickness of gold was > confirmed and found to be in spec. We believe > we
Electronics Forum | Mon Oct 26 17:04:30 EDT 2009 | stepheniii
IIRC the IPC spec for oven profiling says the thermocouple leads should not be more than one meter in length. I think when you can afford it, getting a data logger to go through the oven would be a good idea. But if you are going to use the very lon
Electronics Forum | Mon Nov 30 21:28:54 EST 2009 | davef
"Environment Friendly Electronics: Lead-free Technology", J Hwang, Electrochemical Publications, 2001 [0901150401], Chapter 6.2, contains a significant amount of data on 58Bi/42Sn that may help you better understand the 58Bi/42Sn solder alloy. We'r
Electronics Forum | Wed Mar 10 00:21:34 EST 2010 | geocep
I have recently purchased an ACE Kiss 101A Selective Solder System 4 weeks ago. I am having a terrible experience. The nozzle will not stay wet, and the flux-er pattern continues to shift erratically; all leading to very poor quality process. ACE
Electronics Forum | Fri Mar 26 17:12:43 EDT 2010 | spitkis2
Krish, Looks like your peak temperature is around 230C and time above 183C is about 120-150 seconds. This is excessive for a leaded BGA. You should be aiming at 200 - 215C as the peak joint temperature with time above 183C of 60 -90 seconds. The p
Electronics Forum | Fri Apr 16 14:01:48 EDT 2010 | richardli
It could be the flux condensed in the oven. We plan to clean the vent and filter next week. Then we see if help. I just want to see if anybody has same problem in experience. Soldermask supplier told us the same white soldermask always change to a l
Electronics Forum | Wed May 19 19:41:12 EDT 2010 | jry74
Our employees use a knit style ESD glove when masking boards to prevent oils. They snag alot and bend leads and cause other problems. I have tried dipped palm but they are bulky and dont offer "feel". I tried a silky type but they had a huge seam
Electronics Forum | Thu May 20 07:52:36 EDT 2010 | rgduval
In general, cleaning with deionized water is acceptable for most component. Open switches and contacts, in general, do not get damaged in this process. A good drying is required, of course, after washing. However, you've described dewetting issues
Electronics Forum | Fri Jun 11 03:14:03 EDT 2010 | muarty
Thanks Dax, We currently employ a stencil aperture design pretty much similar to that you describe. And you are correct in what you say about the thermal demands almost dictating the allowable voiding level. We have suggested to our customer that th
