Presentation on theme: "Intermetallic Issues With Wire Joining by Thermocompression & Soldering Dr Henning Leidecker Goddard Space Flight Center, Code 562 Parts, Packaging, and."— Presentation transcript:
Intermetallic Issues With Wire Joining by Thermocompression & Soldering Dr Henning Leidecker Goddard Space Flight Center, Code 562 Parts, Packaging, and Assembly Technologies Office Henning.W.Leidecker@nasa.gov 301-286-9180 21 Oct 2003
But first, a bit about COTS... The Commercial Off-The-Shelf (COTS) market is huge and competitive: the stakes are high. Hence, some of the best designers in the world develop COTS parts, sharply focused on a target market. Often, they hit this market with exquisite precision. But trade-offs are usually made in this target-focused design, and the resulting parts may not be apt for a different market whose needs differ from the target. Reliability over long times (5+ years) is a prime example. ==> DO NOT FEAR COTS BUT BE WARY <==
GSFC Websites about this topic NASA/GSFC Wire Bond Website: Selected Topics of Interest to GSFC Parts http://nepp.nasa.gov/wirebond/Index.htm Richard Katz Website: http://klabs.org/richcontent/fpga_content/pages/notes/fpga_reliability.htm Pay special attention to Horsting's work on the effects of impurities on the bonding pad; see also Issues with Gold Electroplating for Microelectromechanical Systems Applications, by C. A. Kondoleon, et al. Materials Research Society Symposium Proceedings 2002, 687 (143--148)
Indium Solder and 1 mil Gold Wires Before there was wire bonding (e.g., thermocompression), there was soldering Pb-Sn solder dissolves gold; not good for 1 mil. About early 1950's, Indium was used to solder thin gold wires --- Initial success, followed by high frequency (--> 100%) of the joins breaking. The short-term attractiveness of Indium as a solder induces repeated lessons learned!
GSFC Websites about this topic NASA/GSFC Technology Validation Assurance Web Site: http://misspiggy.gsfc.nasa.gov/tva/ Reliability of Laser Diodes for Space Flight Applications: http://misspiggy.gsfc.nasa.gov/tva/meldoc/photonicsdocs/LDreliability.ht m