Electronics Forum | Thu Jun 25 20:26:37 EDT 1998 | Chiakl
| I am looking for a little enlightenment with an issue that we have been seeing. We have SMT assemblies with poor solderability on TSOP and mini-QFP type devices. The solder appears to have incomplete reflow and/or grainyness to the joints. Everythi
Electronics Forum | Tue Jun 30 11:51:41 EDT 1998 | Michael Fogel
| | I am looking for a little enlightenment with an issue that we have been seeing. We have SMT assemblies with poor solderability on TSOP and mini-QFP type devices. The solder appears to have incomplete reflow and/or grainyness to the joints. Everyt
Electronics Forum | Thu Jul 02 19:18:31 EDT 1998 | Rin
| | | | I am looking for a little enlightenment with an issue that we have been seeing. We have SMT assemblies with poor solderability on TSOP and mini-QFP type devices. The solder appears to have incomplete reflow and/or grainyness to the joints. E
Electronics Forum | Thu Jun 25 20:16:01 EDT 1998 | chiakl
| I am looking for a little enlightenment with an issue that we have been seeing. We have SMT assemblies with poor solderability on TSOP and mini-QFP type devices. The solder appears to have incomplete reflow and/or grainyness to the joints. Everythi
Electronics Forum | Wed Apr 09 13:30:20 EDT 2003 | davef
In order to get reliable reflow, you need to be at or higher than [liquidus + 20*C] for about 5 to 10 seconds. [I said 25* in a earlier post, but in an effort to stay on message, I'll stick with 20*] Don't forget that your liquidous is probably NOT
Electronics Forum | Sat Jun 26 15:26:10 EDT 2004 | russ
I am very happy with Alpha Metals WS709 or even WS609. Almost all of our product is Immersion gold and we place down to 16mil pitch every day along with 0201 and uBGA. Immersion gold from my experience, solders extremely well with every paste I hav
Electronics Forum | Tue Jun 07 10:24:59 EDT 2016 | davef
wlsmt: You’ve got to help us out here: * Why did you apply solder paste to capacitors prior to water washing the PCBA [where the caps were attached?]? * Did you reflow the Alpha WS-609? * How is the Alpha WS-820 involved in this? * Talk about the
Electronics Forum | Fri Feb 11 05:44:08 EST 2000 | Dean
Sounds like black pad to me. I just suffered this last week. Track your fab lot codes. Just in case. I processed 1000 fabs of 2 lot codes through 1 line (also WS609). 1 lot code failed with black pad the other did not. With one common mfg. proc
Electronics Forum | Mon Sep 20 14:53:24 EDT 1999 | Doug
I've had some trouble pasting a test board for a MicroBGA trial. Most of the paste remains in the stencil apertures. The stencil is 6 mil thick, laser cut and electo-polished. The apertures are 12 mil in diameter with 20 mil pitch. We are using Alpha
Electronics Forum | Tue Apr 14 09:01:36 EDT 1998 | Justin Medernach
| We are having some difficulty soldering a 240 pin Altera device. We use Alpha WS-609, a very generic profile for that solder paste, and a 6 mil stencil with laser cut apertures (1:1 ratio). This is a 20 mil pitch device (aperture size is 10 mils X
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