Hermeticity of Electronic Packages

Hermeticity of Electronic Packages

2nd Edition - October 5, 2011

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  • Author: Hal Greenhouse
  • eBook ISBN: 9781437778786
  • Hardcover ISBN: 9781437778779

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Description

Hermeticity of Electronic Packages is a book about the integrity of sealed packages to resist foreign gases and liquids penetrating the seal or an opening (crack) in the packageùespecially critical to the reliability and longevity of electronics. The author explains how to predict the reliability and the longevity of the packages based on leak rate measurements and the assumptions of impurities. Non-specialists in particular will benefit from the author's long involvement in the technology. Hermeticity is a subject that demands practical experience, and solving one problem does not necessarily give one the background to solve another. Thus, the book provides a ready reference to help deal with day to day issues as they arise. The book gathers in a single volume a great many issues previously available only in journalsùor only in the experience of working engineers. How to define the ""goodness"" of a seal? How is that seal measured? How does the integrity of the seal affect circuit reliability? What is the significance of the measured integrity of the seal? What is the relationship of Residual Gas Analysis and the seal integrity? The handbook answers these questions and more, providing an analysis of nearly 100 problems representative of the wide variety of challenges that actually occur in industry today.

Readership

Packaging engineers, scientists and technicians as well as novice users, package designers, reliability engineers and those who measure and evaluate the integrity of packages, especially in the field of microelectronics

Table of Contents

  • 1. Gas Kinetics

    1.1. General Considerations

    1.2. Mathematical Relationships

    1.3. Problems and Their Solutions

    2. Viscous and Molecular Conductance of Gases

    2.1. Conduction of Gases

    2.2. Viscous Conduction

    2.3. Molecular Conduction

    2.4. Conduction in the Transitional Range

    2.5. Composite Conductance Equations

    2.6. Smallest Theoretical Leak

    2.7. Discussion

    2.8. Problems and their Solutions

    3. The Flow of Gases

    3.1. General Flow Characteristics

    3.2. Measured, Standard, and True Leak Rates

    3.3. Leak Rates for Different Gases

    3.4. Change of Partial Pressure With Time

    3.5. Viscous Flow From Sealed Packages

    3.6. Viscous Flow Rates of Different Gases

    3.7. Problems and Their Solutions

    4. The Flow of Gases into Sealed Packages

    4.1. Molecular Flow

    4.2. Oxygen Leaking Into Sealed Packages

    4.3. Viscous Flow Into and Out of Sealed Packages

    4.4. The Simultaneous Flow of Gases in Both Directions

    4.5. Problems and their Solutions

    5. Understanding Fine Leak Testing in Accordance with Method 1014, MIL-STD-883

    5.1. Purpose of the Test

    5.2. Basis of the Test

    5.3. Fixed Method of Testing

    5.4. Flexible Method of Testing

    5.5. Comparison of the Fixed and Flexible Methods

    5.6. The Effect of Viscous Flow

    5.7. Leak Rate Limits are Too Lenient

    5.8. Backfilling the Package with Helium

    5.9. Bombing after Backfilling

    5.10. Leak Rate Measurements Using Krypton-85 Tacer Gas

    5.11. Problems and their Solutions

    6. Fine Leak Measurements Using a Helium Leak Detector

    6.1. Principle of Operation

    6.2. Definitions

    6.3. Calibration Using a Standard Leak

    6.4. Measurement Errors, Not Including Background Errors

    6.5. Background Errors

    6.6. Errors Due to Helium on the External Surface of the Package

    6.7. Minimum Detectable Leak (MDL)

    6.8. Correlation of Standard Leaks

    6.9. Cumulative Helium Leak Test (CHLT)

    6.10. Locating Leaks in Packages

    6.11. Problems and their Solutions

    7. Gross Leaks

    7.1. Introduction

    7.2. Forcing a Liquid Into a Package

    7.3. Fluorocarbon Vaporexiting a Package

    7.4. The Bubble Test

    7.5. The Vapor Detection Test

    7.6. The Weight Gain Test

    7.7. Optical Leak Test

    7.8. Penetrant Dye Test

    7.9. Fluorocarbons From a Residual Gas Analysis

    7.10. Quantitative Comparison of Gross Leak Test Methods

    7.11. Problems and their Solutions

    8. The Permeation of Gases Through Solids

    8.1. Description of the Permeation Process

    8.2. Effect of Temperature on Permeation

    8.3. Treating Permeation as a Leak Rate

    8.4. Water Vapor Passing Through Plastics

    8.5. Problems and their Solutions

    9. Water in Sealed Packages

    9.1. Water Related Corrosion and Circuit Failures

    9.2. Water Leaking Into a Sealed Package From the Outside Environment

    9.3. Water Outgassing Inside the Package

    9.4. Water as a Result of a Chemical Reaction Within the Package

    9.5. Problems and their Solutions

    10. Residual Gas Analysis (RGA)

    10.1. Description of the Test

    10.2. What the Test Measures

    10.3. Calculation of Leak Rates from RGA Data

    10.4. Interpretation of RGA Data

    10.5. The Qualification of Small Packages Using RGA

    10.6. Problems and their Solutions

    11. Residual Gas Analysis (RGA) and Failure Modes

    11.1. History and Background – Moisture in Sealed Microelectronic Devices

    11.2. Volatiles Other Than Moisture

    11.3. Mass Spectrometry for Package Gas Analysis

    11.4. Interpreting Gas Analysis Reports

    11.5. Headspace Gas Compositions

    11.6. Confusing Test Results

    11.7. Moisture Compliance and Hermeticity

    11.8. Conclusion

    11.9. Problems and their Solutions

Product details

  • No. of pages: 360
  • Language: English
  • Copyright: © William Andrew 2011
  • Published: October 5, 2011
  • Imprint: William Andrew
  • eBook ISBN: 9781437778786
  • Hardcover ISBN: 9781437778779

About the Author

Hal Greenhouse

Affiliations and Expertise

Bendix Aviation Corporation (retired)

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