Electronics Forum | Thu Oct 25 16:48:29 EDT 2001 | Cemal Basaran
We can inspect and measure strain field in anything larger than 320nm with Laser techniques we have. We can do this measurements during fatigue testing. Of course thick intermetallic region as a solid region is a problem due to the fact that you ha
Electronics Forum | Tue May 21 16:18:57 EDT 2019 | edhare
Interesting problem. I've seen this before on SMT device leads (see Gold Embrittlement paper at http://www.semlab.com). The AuSn4 IMC is solid at typical reflow temperatures and traps volatiles in the solder joint. One usually cannot crank the ref
Electronics Forum | Thu Nov 01 17:40:52 EST 2001 | davef
Listen to Wolfgang. Your dull solder connection is a process indicator. Some 63Sn / Au solder connections look grainy, depending on how your process them and the materials involved. Gold dissolving in tin forms an intermetallic compound [AuSn4] th
Electronics Forum | Tue Sep 09 20:32:10 EDT 2003 | davef
The maximum ratio of gold weight to solder alloy weight can be calculated, to help prevent a problem from excessive gold-tin intermetallic compound (i.e., AuSn4). For the equation and its derivation, please refer to "The Use of Capillary Action Measu
Electronics Forum | Fri Sep 17 15:01:05 EDT 1999 | Dave F
| | We have some SMT components with gold plated leads. They're actually LCC led packages. A good solder alloy to use would be Indium / Lead to reduce tin dissolution into the gold and avoid the resultant brittle intermetallic compound. However, a re
Electronics Forum | Sat Sep 18 04:42:52 EDT 1999 | Brian
Dave, I'll respond by paragraph: | | | Brian: | | I like Ag2 also. I prefer it over both 63/37 and 60/40, if the price is not a factor. Yes, gold rips through eutectic and near-eutectic solders like habanero slathered shiitake burritos through
Electronics Forum | Sat Sep 18 12:27:21 EDT 1999 | Earl Moon
| | | Dave, I'll respond by paragraph: | | | | | Brian: | | | | I like Ag2 also. I prefer it over both 63/37 and 60/40, if the price is not a factor. Yes, gold rips through eutectic and near-eutectic solders like habanero slathered shiitake
Electronics Forum | Wed Oct 24 18:08:02 EDT 2001 | davef
1- DF1: WOW!!! How do people get these cool toys? CB: I am with the University at Buffalo Electronic Packaging Lab. http://www.packaging.buffalo.edu We have pretty much everything that is sold on the market as well as Laser inspection technologies we
Electronics Forum | Sat Sep 18 13:05:57 EDT 1999 | Brian
| | | | | | Dave, I'll respond by paragraph: | | | | | | | Brian: | | | | | | I like Ag2 also. I prefer it over both 63/37 and 60/40, if the price is not a factor. Yes, gold rips through eutectic and near-eutectic solders like habanero slath
Electronics Forum | Sat Sep 18 14:37:00 EDT 1999 | Earl Moon
| | | | | | | | | Dave, I'll respond by paragraph: | | | | | | | | | Brian: | | | | | | | | I like Ag2 also. I prefer it over both 63/37 and 60/40, if the price is not a factor. Yes, gold rips through eutectic and near-eutectic solders like
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