Printed Wiring Assemblies : Reliability Stress Screening
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چکیده
Page 1 Scope . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Field of application . . . . . . . . . . . . . . . . . . . 2 3 Reference . . . . . . . . . . . . . . . . . . . . . . . 2 4 Definitions . . . . . . . . . . . . . . . . . . . . . . . . 2 5 Sampling . . . . . . . . . . . . . . . . . . . . . . . 3 5.1 Sample preparation . . . . . . . . . . . . . . . . . 3 5.2 RSS time planning . . . . . . . . . . . . . . . . . 4 5.3 Reduced RSS process determination . . . . . . . 4 6 Method of RSS . . . . . . . . . . . . . . . . . . . . 4 6.1 Principle . . . . . . . . . . . . . . . . . . . . . . . 4 6.1.1 Initial RSS test . . . . . . . . . . . . . . . . . 4 6.1.2 Optimum RSS process duration . . . . . . . 4 6.1.3 Function test . . . . . . . . . . . . . . . . . . 4 6.1.4 Pass/failure criteria . . . . . . . . . . . . . . 4 6.1.5 Failure analysis . . . . . . . . . . . . . . . . 5 6.1.6 Selection of stress types and stress levels . . . 5 6.2 Applicable stress types . . . . . . . . . . . . . . . 5 6.2.1 Constant high temperature . . . . . . . . . . 5 6.2.1.1 Passive “bake” process . . . . . . . . 5 6.2.1.2 “Bake” process with applied voltage . . . 6 6.2.1.3 “Bake” process with power dissipation . . 6 6.2.2 Low/high temperature cycling . . . . . . . . . 6 6.2.2.1 Passive temperature cycling . . . . . 6 6.2.2.2 Temperature cycling with power dissipation . . . . . . . . . . . . . . . . 6 6.2.3 Vibration and other mechanical stress . . . . 7 6.2.3.1 Fixed frequency sinusoidal vibration . . . 7 6.2.3.2 Swept frequency sinusoidal vibration . . 8 6.2.3.3 Random vibration . . . . . . . . . . . 8 6.2.3.4 Bump . . . . . . . . . . . . . . . . . 8 6.2.3.5 Other mechanical stresses . . . . . . 8 6.2.4 Combination of temperature cycling and random vibration . . . . . . . . . . . . . . . . . . . . 8 6.2.5 Humidity . . . . . . . . . . . . . . . . . . . . 9 6.2.5.1 Constant high humidity and temperature . . . . . . 9 6.2.5.2 High humidity and temperature cycling . . . . . . 9 6.2.6 Operational stress . . . . . . . . . . . . . . . 9 6.2.6.1 Constant operational stress . . . . . . 9 UDC 621.38
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