Electronics Forum | Thu Apr 22 14:09:50 EDT 1999 | Rick
| | | Do solders exist that are both lead-free and low-temperature (e.g. 100-170 Celsius range)? If so, who supplies these materials? Any websites or contact information would be most helpful. | | | | | | Also, I am not an expert on soldering, s
Electronics Forum | Fri Sep 07 10:46:23 EDT 2001 | davef
Comments are: * Sn42Bi58 is eutectic at 138�C. Most top-flight paste suppliers will produce it for you. * Bismuth forms an alloy with lead with a melting point of 93�C * Maximum temperature of the solder connection should be less than 100�C during
Electronics Forum | Thu Oct 18 18:39:15 EDT 2001 | davef
Responding to your questions ... RELIABILITY OF 1% SILVER SOLDER PASTE: It�s as good as the next solder paste, all other things the same. Look at your back articles by Jennie Hang in SMT magazine. I want to say she wrote an article on the topic i
Electronics Forum | Mon Jul 01 15:37:56 EDT 2002 | pjc
Possible cause can be design related- if the solder land is too small. Check w/ IPC SM-782 Solder Land Design Guide Another is board finish. I have seen problems like this with Gold finished PWBs- which creates a more brittle solder joint.Another pos
Electronics Forum | Wed Oct 09 20:52:27 EDT 2002 | davef
Russ, Be careful on how you determine your liquidous point. Sure 205-210�C is fine if your paste and the solderability protection on pads and component leads are near eutectic solder and things worked according to plan, but in real life it doesn't
Electronics Forum | Thu Mar 04 20:05:47 EST 2004 | pdeuel
Russ, Thanks for the laugh. Glad to know some of you still have a sence of humor. I also could not figure out the reason for this thread. I will hadzard a guess that melting point of lead with aloy would not be diferant from melting point of lead by
Electronics Forum | Sat Mar 06 22:26:34 EST 2004 | Ken
I think it is a good idea to "waste" money on this analysis. Especially if you phase in a SAC wave alloy. Silver is not toxicity free....and lead free waves can dross 3 to 5 times faster than SnPb alloys. This produces a greater potential for airb
Electronics Forum | Tue Jun 15 17:36:32 EDT 2004 | johnthor
I don't recall if a specific alloy was mentioned just that most lead free alloys would not melt with a Pb profile and result in a less reliable joint in the long term. There was also concern about tin whiskers. Try the archives at http://www.ipc.or
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 | Tue Feb 01 12:52:19 EST 2005 | jbrower
Hi Tom, I did talk to Bob Gilbert about the sn100c. His comment is that it is a nickle stabalized alloy. Simplisticly, the tin and copper molecules would rather bond with the nickle. He also mentioned that with the SAC alloys, the manufactuers were
