Electronics Forum | Thu Jun 23 11:56:51 EDT 2005 | wjxingggg
Hi, all. There is one 0.8mmX0.8mm QFN on almost of our PWBAs. But the quality report showed that we got bad solder quality for this component. My question is which elements are the root cause for this situation frequently? Thanks.
Electronics Forum | Fri Aug 02 18:30:45 EDT 2013 | hegemon
We use our Yestech and Mirtec to do that same thing. Verify the lead is in the hole and check the solder fillet. This is done as part of our normal solder inspection for mixed technology high runners. You may not be able to put together a program
Electronics Forum | Tue Aug 22 12:44:28 EDT 2006 | russ
Cannot be done, no way to solder the heat pad underneath center. P.S. Rob also spells color wrong!!! must have been a real bad school!! How does the wave master do it? Russ
Electronics Forum | Fri Jun 29 07:47:16 EDT 2012 | mosborne1
Dave Thanks for the input. The thermocouple read 244 on the pad of the socket. We actually found after extensive investigation that it is the coplanarity of the leads. We were shipped a bad batch of sockets form the manufacture. Go figure!!1
Electronics Forum | Sat Sep 18 12:10:19 EDT 2004 | Steve Gregory
I have a question about solder masking via's in a BGA pattern, and want to see if I'm thinking correctly about this. This problem is kind of along the same line as Carol's problem earlier. I think it's a bad idea to leave the via's free from solder
Electronics Forum | Thu Dec 16 16:28:51 EST 2004 | Indy
Hi, We are using Sn/3.0Ag/0.5Cu solder paste on Pd/Ag pad metallization in one of our application. Could someone provide me information on the following: 1. How bad is the Leaching of Ag in SAC alloy and how it can be mitigated. 2. During reflow so
Electronics Forum | Fri Apr 06 08:27:09 EDT 2001 | CAL
From what you are saying................If I hear ya correctly - There is no "Proctective" on the Pads (OSP, HASL....) You will be hard pressed soldering to bare copper. This can not be right. My suggestion- go polyimide with electroptical connecti
Electronics Forum | Fri Apr 06 08:28:34 EDT 2001 | CAL
From what you are saying................If I hear ya correctly - There is no "Protective" on the Pads (OSP, HASL....) You will be hard pressed soldering to bare copper. This can not be right. My suggestion- go polyamide with electroptical connectio
Electronics Forum | Tue Dec 10 14:10:38 EST 2002 | Randy Villeneuve
Steve, I wave solder most if not all our boards with selective wave pallets. I did not catch if the solder balls were on top of the board or on the bottom but that will make a difference on what to do to get rid of them. Pallets are good and bad. On
Electronics Forum | Thu Aug 08 11:58:25 EDT 2013 | rway
I am not that familiar with the older systems. The software should be supported on both old and new alike unless you are limited by the operating system, but the camera will obviously have a lower resolution and perhaps the filtering is not quite as
