SnPb Including High Temperature High Pb
For wafer and substrate-bumping applications, lead (Pb)-containing solders have been used for many years. Although 95Pb/5Sn and 90Pb/10Sn are the most common, the lower melting eutectic solder was prevalent for many years.
The selection of lead-based alloys for power semiconductor applications is very large, and their usage is likely to continue into the future; however, some long-standing Pb-free alloys and some novel high melting Pb-free solder paste technologies are used in specific applications.
|Commonly used in step soldering with higher Pb solders||5||10||85||240°C||256°C|
|Excellent thermal cycling and fatigue resistance||81||19||260°C||275°C|
|Excellent thermal cycling and fatigue resistance||2.5||92.5||5||300°C||310°C|
|Automotive and similar usage||5||95||308°C||312°C|
|Automotive and similar usage||10||90||275°C||302°C|
|Old standard alloy for die attach, but poor thermal cycling||10||2||88||268°C||290°C|
|Industry standard for silicon die-attach||5||2.5||92.5||287°C||296°C|
|Alternative alloy for silicon die-attach||2||2.5||95.5||299°C||304°C|
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SnPb Including High Temperature High Pb Blog Posts
Here’s a true story regarding the service temperature of solder joints. Yesterday, as I left work, I noticed that it felt really hot outside. I got in my car and cranked up the AC. I...
In today’s electronics manufacturing industry, many companies are using lead-free solder alloys. However, there are a few sectors in the industry that prefer the reliability and performance of tin-lead alloys. I’ve recently received a number of questions from customers asking how to adjust their solder pot to get the desired...
Folks, It is hard to believe that in July we will celebrate the 9th anniversary of the advent of RoHS. So the timing seemed right when I was recently asked to speak at the Boston SMTA Chapter on “The Status of Lead-Free 2015: A Perspective”. An overview...
Andy C. Mackie, PhD, MSc
Senior Product Manager,
Semiconductor Assembly Materials
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