Environmental Stress Screening (ESS)

1/2 DAY

Environmental Stress Screening (ESS) is a program, which subjects products such as hybrids and microwave modules, to environmental stress in order to precipitate latent defects and screen out failures that may otherwise show up early in the product life cycle. ESS is a dynamic program that changes based on production yield and early life failures.

This course is intended for process engineers, quality engineers, and managers responsible for screening and qualification testing of hybrids and microwave modules.

Course Outline

Review of MIL-PRF-38534 Requirements for Screening and Qualification

Theory and technical rationale for screening vs. qualification
Class H vs. Class K screening and qualification requirements
Clarification of destruct vs. non-destruct test methods

Basic Review of MIL-STD-883 Test Methods (e.g., temp cycle, constant acceleration, burn in, etc.)

Element Evaluation Screening
Microcircuit and semiconductor die level
Passive elements (e.g. discrete chip resistors, capacitors etc.)
Substrate evaluation
Package evaluation
Polymeric materials (e.g., epoxy, particle getters)

Hybrid Device Screening for Class K and Class H Hybrids
Pre Cap environmental stress screening
Required Post Cap environmental stress screening

Review of Typical ESS at the PWB and Black Box Level

Course Summary

Student Examination Test and Review

Student Feedback and Course Critique

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