NDLI: Effect of preconditioning and soldering on failures of chip tantalum capacitors

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Effect of preconditioning and soldering on failures of chip tantalum capacitors

Content Provider	NASA Technical Reports Server (NTRS)
Author	Teverovsky, Alexander A.
Copyright Year	2014
Description	Soldering of molded case tantalum capacitors can result in damage to Ta205 dielectric and first turn-on failures due to thermo-mechanical stresses caused by CTE mismatch between materials used in the capacitors. It is also known that presence of moisture might cause damage to plastic cases due to the pop-corning effect. However, there are only scarce literature data on the effect of moisture content on the probability of post-soldering electrical failures. In this work, that is based on a case history, different groups of similar types of CWR tantalum capacitors from two lots were prepared for soldering by bake, moisture saturation, and longterm storage at room conditions. Results of the testing showed that both factors: initial quality of the lot, and preconditioning affect the probability of failures. Baking before soldering was shown to be effective to prevent failures even in lots susceptible to pop-corning damage. Mechanism of failures is discussed and recommendations for pre-soldering bake are suggested based on analysis of moisture characteristics of materials used in the capacitors' design.
File Size	8446228
Page Count	52
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20140017366
Archival Resource Key	ark:/13960/t4sj6gm91
Language	English
Publisher Date	2014-09-05
Access Restriction	Open
Subject Keyword	Multilayer Ceramic Capacitor (mlcc) Base-metal-electrode (bme) Breakdown Voltage Ceramic Capacitors Reliability Leakage Capacitors Structural Failure Moisture Mechanical Properties Dielectrics Microelectronics Overvoltage Integrated Circuits Thermodynamics Tantalum Chips Electronics Soldering Anodes Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Presentation

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