Logistics for the implementation of lead-free solders on electronic assemblies
- Sandia National Labs., Albuquerque, NM (United States)
- AT and T Bell Labs., Princeton, NJ (United States). Engineering Research Center
The prospects of legislative and regulatory action aimed at taxing, restricting or banning lead-bearing materials from manufactured products has prompted the electronics community to examine the implementation of lead-free solders to replace currently used lead-containing alloys in the manufacture of electronic devices and assemblies. The logistics for changing the well established ``tin-lead solder technology`` require not only the selection of new compositions but also the qualification of different surface finishes and manufacturing processes. The meniscometer/wetting balance technique was used to evaluate the wettability of several candidate lead-free solders as well as to establish windows on processing parameters so as to facilitate prototype manufacturing. Electroplated and electroless 100Sn coatings, as well as organic preservatives, were also examined as potential alternative finishes for device leads and terminations as well as circuit board conductor surfaces to replace traditional tin-lead layers. Sandia National Laboratories and AT&T have implemented a program to qualify the manufacturing feasibility of surface mount prototype circuit boards using several commercial lead-free solders by infrared reflow technology.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 10111920
- Report Number(s):
- SAND-93-0226C; CONF-9304117-6; ON: DE94004800; BR: GB0103012
- Resource Relation:
- Conference: International waste management conference,San Juan (Puerto Rico),28 Apr - 1 May 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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