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Abstract
This paper is a description of theoretical models applied for the numerical interpretation of the experimental amplitude and phase frequency thermoacoustic characteristics observed for the transistor’s packaging TO-39 with model holes of known radii in the packaging. They are essential from the point of view of determination of the sensitivity of the thermoacoustic method applied for the measurements of the air-tightness of packagings of electronic elements. In this paper, two models of the thermoacoustic signal are described, which are based on a transformation of the thermoacoustic effect to an electrical circuit: CRC and CRLC. Additionally, a method of extraction of the signal, coming from the hole in the packaging, from the total thermoacoustic signal, of the TO-39 packaging, is presented and discussed. The limitation of this method of detection of the air-tightness, caused by the thermoacoustic signal of the air-tight packaging, is also discussed.
Highlights
The hermeticity of electronic components is a crucial reliability parameter, especially under extreme conditions or when the high reliability of electronic devices is essential
Standards [1,2,3,4,5] define test methods which are used in the electronics industry
The thermoacoustic test method presented in this article may be considered as an another example of a non-destructive alternative for destructive industrial hermeticity tests, especially for destructive gross leak detection methods such as a fluorocarbon bubble test or dye penetrant liquid test
Summary
The hermeticity of electronic components is a crucial reliability parameter, especially under extreme conditions (high temperature, humidity, or pressure) or when the high reliability of electronic devices is essential (e.g., avionics, medicine). The main disadvantage of a majority of the methods included in the industrial standards is their destructivity, M. The second group of methods described in [10,11,12,13] uses different piezoelectric, resistive, or capacitive internal structures of the component which monitor the changes of the internal pressure or the humidity increase inside of the package. The thermoacoustic test method presented in this article may be considered as an another example of a non-destructive alternative for destructive industrial hermeticity tests, especially for destructive gross leak detection methods such as a fluorocarbon bubble test or dye penetrant liquid test. The method presented in the article is intrinsically non-destructive, as it does not use any agents which may penetrate the package of the component and break its integrity. The current paper focuses on modeling of different phenomena linked with the package air-tightness and factors which limit the sensitivity of the method
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